You would need to walk at a brisk pace for about 1 hour and 40 minutes to burn off the calories obtained from eating the cheeseburger.
25 g of protein and 31 g of carbohydrates release 4 cal/g, which equals 240 calories. 25 g of fat release 9 cal/g, which equals 225 calories. So, the total calories in the cheeseburger are 465.
Now, to burn off 465 calories at a rate of 280 cal/h, we need to divide 465 by 280, which equals 1.66 hours or approximately 1 hour and 40 minutes.
In summary, to burn off the calories obtained from a cheeseburger containing 25 g of protein, 25 g of fat, and 31 g of carbohydrates, you would need to walk at a brisk pace for about 1 hour and 40 minutes.
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Acids and Bases
Show all your work.
Box final anwers.
Use the given numbering in order.
1. What is the pH if [H+] = 1 x 10 (-3) ?
2. What is the pOH if [OH-] = 1 x 10 (-8) ?
3. What is the pH if [OH-] = 1 x 10 (-13) ?
4. What is the pOH if [H+] = 1 x 10 (-5) ?
5. What is the [H+] if the pH = 3?
6. What is the [OH-] if the pOH = 2 ?
7. What is the [H+] if the pOH = 13?
8. What is the [OH-] if the pH = 4?
9. What is the [OH-] if the [H+] = 1 x 10 (-4) ?
10. What is the [H+] if the [OH-] = 1 x 10 (-2) ?
11. What is the pOH if the pH = 6?
12. What is the pH if the pOH = 12?
13. A solution has a pH = 4. Is it basic, acidic or neutral?
14. A solution has a pOH = 2. Is it basic, acidic or neutral?
15. What is an indicator?
16. What is the an acid and a base according to Bronsted-Lowery?
On Acids and Bases:
381510⁽⁻³⁾ M10⁽⁻²⁾ M10⁽⁻¹³⁾ M10⁽⁻⁴⁾ M1 x 10⁽⁻¹⁰⁾ M1 x 10⁽⁻¹²⁾ M82acidicbasicHow to find pH?1. pH = -log[H⁺] = -log(1 x 10⁽⁻³⁾) = 3
2. pOH = -log[OH⁻] = -log(1 x 10⁽⁻⁸⁾) = 8
3. [H+] = 1 x 10⁽⁻¹⁴⁾/[OH-] = 1 x 10⁽⁻¹⁴⁾/(1 x 10⁽⁻¹³⁾) = 0.1 M
pH = -log[H⁺] = -log(0.1) = 1
4. pOH = -log[OH⁻] = -log(1 x 10⁽⁻⁹⁾) = 9
pH + pOH = 14
pH = 14 - pOH = 14 - 9 = 5
5. [H⁺] = 10^(-pH) = 10⁽⁻³⁾ M
6. [OH⁻] = 10^(-pOH) = 10⁽⁻²⁾ M
7. [H⁺] = 10^(-pOH) = 10⁽⁻¹³⁾ M
8. [OH⁻] = 10^(-pH) = 10⁽⁻⁴⁾ M
9. [OH⁻][H⁺] = 1 x 10⁽⁻¹⁴⁾
[OH⁻] = 1 x 10⁽⁻¹⁴⁾/[H+] = 1 x 10⁽⁻¹⁴⁾)/(1 x 10⁽⁻⁴⁾) = 1 x 10⁽⁻¹⁰⁾ M
10. [H⁺][OH⁻] = 1 x 10⁽⁻¹⁴⁾
[H⁺] = 1 x 10⁽⁻¹⁴⁾/[OH-] = 1 x 10⁽⁻¹⁴⁾/(1 x 10⁽⁻²⁾) = 1 x 10⁽⁻¹²⁾ M
11. pH + pOH = 14
pOH = 14 - pH = 14 - 6 = 8
12. pH + pOH = 14
pH = 14 - pOH = 14 - 12 = 2
13. pH < 7, so the solution is acidic.
14. pOH < 7, so the solution is basic.
15. An indicator is a substance that changes color depending on the pH of the solution.
16. According to the Bronsted-Lowery theory, an acid is a substance that donates a proton (H⁺) and a base is a substance that accepts a proton (H⁺).
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Complete the word equation for making a salt. Metal oxide + → salt + water
Answer:
An acid
Explanation:
a metal oxide e.g NaOH +an acid e.g HCl=>salt e.g NaCl+water
What will be the products when CuF2 reacts with Li? Do not worry about balancing this.
A. LiF + Cu
B. Li + Cu + F2
C. No Reaction
D. F2 + LiCu
C. No Reaction will be the products when CuF2 reacts with Li
How does a double-replacement response work?The positive and negative ions of two ionic compounds switch positions to generate two new compounds in a process known as a double replacement reaction. In aqueous solution, double-replacement reactions often take place between compounds.
In conclusion, you cannot balance a reaction by modifying or adding new components. To ensure that mass is preserved, the only thing you can do is alter the quantity of particles, or moles of particles, involved.
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HALIDES 1. Give the definition for oxidation and reduction. (0. 4 pts) 2. If we were to mix a silver nitrate solution with the following halide containing salts, which one would produce a precipitate. CaF2, MgCl2, LiI, NaF, and KBr. (0. 3 pt each) 2. If a student were to add a Br2(aq) solution to an aqueous NaCl solution mixed with mineral oil, what would the expected result be after shaking the mixture
Oxidation is the process in which an atom, ion, or molecule loses one or more electrons, resulting in an increase in its oxidation state. Reduction, on the other hand, is the process in which an atom, an ion, results in a decrease in its oxidation state. And only [tex]KBr[/tex] [tex]CaF_2[/tex] would result in precipitate
These two processes occur simultaneously in a chemical reaction and are referred to as redox reactions. When a halide ion is mixed with a silver nitrate solution, a precipitation reaction may occur if the resulting compound is insoluble in water. [tex]KBr[/tex] [tex]CaF_2[/tex] would result in a precipitate, as they form insoluble compounds with silver ions. [tex]MgCl_2[/tex], [tex]LiI[/tex] and [tex]NaF[/tex] would not result in a precipitate as they form soluble compounds with silver ions.
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--The complete Question is, What is the difference between oxidation and reduction in a chemical reaction?
Which of the following halide-containing salts, when mixed with a silver nitrate solution, would result in a precipitate: CaF2, MgCl2, LiI, NaF, or KBr? --
A mixture of 100 mol containing 60 mol % n-pentane and 40 mol% n-heptane is vaporized at 101. 32 kpa abs pressure until 40 mol of vapor and 60 mol of liquid in equilibrium with each other are produced. This occurs in a single-state system, and the vapor and liquid are kept in contact with each other until vaporization is complete.
required:
calculate the composition of the vapor and the liquid
The composition of the vapor and liquid in the mixture containing 60 mol% n-pentane and 40 mol% n-heptane is as follows:
Vapor composition: 75 mol% n-pentane, 25 mol% n-heptane
Liquid composition: 50 mol% n-pentane, 50 mol% n-heptane
1. Calculate the initial moles of each component:
n-pentane: 100 mol * 0.6 = 60 mol
n-heptane: 100 mol * 0.4 = 40 mol
2. Determine the moles of vapor produced:
40 mol vapor = x mol n-pentane + y mol n-heptane
3. Calculate the moles of liquid remaining:
60 mol liquid = (60 - x) mol n-pentane + (40 - y) mol n-heptane
4. Apply the equilibrium condition:
x / (60 - x) = y / (40 - y)
5. Solve the system of equations to find the moles of each component in the vapor and liquid phases:
x = 30 mol n-pentane, y = 10 mol n-heptane
6. Calculate the vapor composition:
n-pentane: 30 mol / 40 mol = 0.75 or 75%
n-heptane: 10 mol / 40 mol = 0.25 or 25%
7. Calculate the liquid composition:
n-pentane: (60 - 30) mol / 60 mol = 0.5 or 50%
n-heptane: (40 - 10) mol / 60 mol = 0.5 or 50%
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Silver tarnishes in presence of hydrogen sulphide and oxygen because of the reaction 4Ag + 2 H2S + O2 → 2 Ag2S + 2 H2O How much Ag2S is obtained from a mixture of 0. 950 g Ag, 0. 140 g of H2S and 0. 08000 g O2
According to the question the mass of Ag₂S produced is 0.063 g.
What is mass?Mass is a measure of the amount of matter an object contains. It is usually measured in kilograms and grams, and is an important concept in physics and chemistry. Mass is related to other properties such as weight, density, and momentum. Mass can be determined either by measuring the object's weight in a gravitational field or by measuring its inertia, which is its resistance to acceleration caused by a force.
The amount of Ag₂S produced can be calculated using the molar ratio of the reactants and products in the equation: 4Ag + 2 H₂S + O2 → 2 Ag₂S + 2 H₂O
First, calculate the amount of each reactant in moles:
Ag: 0.950 g / 107.87 g/mol = 0.00877 mol
H₂S: 0.140 g / 34.08 g/mol = 0.0041 mol
O2: 0.08000 g / 32.00 g/mol = 0.0025 mol
Then, use the molar ratio to calculate the amount of Ag2S produced:
2 Ag₂S = 0.00877 mol x (2 mol Ag₂S/4 mol Ag) = 0.0044 mol
Therefore, the mass of Ag₂S produced is 0.0044 mol x 143.7 g/mol = 0.063 g.
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The mass of [tex]Ag_2S[/tex] obtained from the given mixture is 1.015 g.
The given chemical equation shows that 4 moles of Ag react with 2 moles of [tex]H_2S[/tex] and 1 mole of [tex]O_2[/tex] to form 2 moles of [tex]Ag_2S[/tex] and 2 moles of [tex]H_2O[/tex].
To determine the mass of [tex]Ag_2S[/tex] produced, we need to find out the limiting reactant first. The limiting reactant is the reactant that is completely consumed during the reaction and limits the amount of product that can be formed.
We can find the limiting reactant by calculating the amount of product that can be formed from each reactant.
For Ag:
The molar mass of Ag is 107.87 g/mol. The number of moles of Ag present is:
0.950 g / 107.87 g/mol = 0.00880 mol
The amount of [tex]Ag_2S[/tex] that can be formed from 0.00880 mol of Ag is:
0.00880 mol Ag x (2 mol [tex]Ag_2S[/tex] / 4 mol Ag) = 0.00440 mol [tex]Ag_2S[/tex]
For [tex]H_2S[/tex]:
The molar mass of [tex]H_2S[/tex] is 34.08 g/mol. The number of moles of [tex]H_2S[/tex] present is:
0.140 g / 34.08 g/mol = 0.00410 mol
The amount of [tex]Ag_2S[/tex] that can be formed from 0.00410 mol of [tex]H_2S[/tex] is:
0.00410 mol [tex]H_2S[/tex] x (2 mol [tex]Ag_2S[/tex] / 2 mol [tex]H_2S[/tex]) = 0.00410 mol [tex]Ag_2S[/tex]
For [tex]O_2[/tex]:
The molar mass of [tex]O_2[/tex] is 32.00 g/mol. The number of moles of [tex]O_2[/tex] present is:
0.08000 g / 32.00 g/mol = 0.00250 mol
The amount of [tex]Ag_2S[/tex] that can be formed from 0.00250 mol of [tex]O_2[/tex] is:
0.00250 mol [tex]O_2[/tex] x (2 mol [tex]Ag_2S[/tex] / 1 mol O2) = 0.00500 mol [tex]Ag_2S[/tex]
From the above calculations, we can see that the amount of [tex]Ag_2S[/tex] that can be formed from Ag is 0.00440 mol, from [tex]H_2S[/tex] is 0.00410 mol, and from [tex]O_2[/tex] is 0.00500 mol.
Since the smallest amount of [tex]Ag_2S[/tex] that can be formed is from [tex]H_2S[/tex], it is the limiting reactant. Therefore, the amount of [tex]Ag_2S[/tex] that can be formed is 0.00410 mol.
The molar mass of [tex]Ag_2S[/tex] is 247.80 g/mol. Therefore, the mass of [tex]Ag_2S[/tex] that can be formed is:
0.00410 mol [tex]Ag_2S[/tex] x 247.80 g/mol = 1.015 g [tex]Ag_2S[/tex] (rounded to three significant figures)
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Complete question:
What is the mass of Ag2S obtained from a mixture of 0.950 g Ag, 0.140 g of H2S, and 0.08000 g O2, according to the reaction 4Ag + 2H2S + O2 → 2Ag2S + 2H2O?
In the following acid-base reaction hpo42- is the_____________
In the following acid-base reaction, hpo₄²⁻ is the base.
This can be seen as it accepts a proton (H⁺) from H₂O to form the conjugate acid, H₂PO₄⁻. The other reactant, H₂O, donates the proton, making it the acid in the reaction. It is important to note that in an acid-base reaction, the species that donates a proton is the acid and the species that accepts the proton is the base.
The strength of the acid and base can also be determined by the equilibrium constant of the reaction. The larger the equilibrium constant, the stronger the acid or base. In this particular reaction, hpo₄²⁻ is a weak base, as it only partially accepts the proton from H₂O.
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When a person perspires (sweats), the body loses many sodium ions and potassium ions. The evaporation of sweat cools the skin. After a strenuous workout, people often quench their thirst with sports drinks that contain NaCl and KCl. A single 250. -gram serving of one sports drink contains 0. 055 gram of sodium ions
Sports drink helps to ensure that the body has enough sodium to maintain proper hydration levels and to prevent dehydration.
Electrolytes play a crucial role in various bodily functions, including muscle contractions, nerve impulses, and regulating fluid balance. This is important because the movement of ions across cell membranes is what generates electrical signals in the body. When a person perspires, the sweat that is released from their body contains both sodium and potassium ions. These ions are lost through the process of sweating. However, the evaporation of sweat helps to cool the skin.
After a strenuous workout, it is important to replenish the lost electrolytes by drinking sports drinks that contain NaCl (sodium chloride) and KCl (potassium chloride). For example, a single 250-gram serving of one sports drink contains 0.055 grams of sodium ions. This replaces the lost electrolytes and help maintain proper fluid balance in the body.
In conclusion, after a strenuous workout, it is essential to replenish the lost sodium ions and potassium ions to maintain the body's electrolyte balance and ensure proper muscle and nerve function. Thus, Sports drinks containing NaCl and KCl can be an effective way to replace these ions and quench thirst.
The question should be:
When a person perspires (sweats), the body loses many sodium ions and potassium ions. The evaporation of sweat cools the skin. After a strenuous workout, people often quench their thirst with sports drinks that contain NaCl and KCl. A single 250gram serving of one sports drink contains 0. 055 gram of sodium ions. How sports drinks containing NaCl and KCl can be an effective way to replace these ions?
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Three (3) brine solutions B1, B2, and B3 are mixed. B1 is one-half of this mixture (one-half of mixture mass, not volume). Brine B1 is 2. 5% salt, B2 is 4. 5% salt and B3 is 5. 5% salt. To this mixture is added 35 lbm of dry salt, while 230 lbm of water is evaporated leaving 3200 lbm of 5. 1% brine. Determine the amounts (in lbm) of B1, B2, and B3
The mass of B1 is one-half of the total mass of the mixture before any salt or water is added.The mass of B1 is 1582.5 lbm.
What is mixture ?Mixture is a combination of two or more substances that are not chemically combined. Mixtures can be either homogeneous, meaning the substances are uniformly dispersed, or heterogeneous, meaning the substances are not evenly distributed. Examples of mixtures include sand and water, sugar and water, and salt and pepper.
Since we are given that the total mass of the mixture is 3200 lbm and that 35 lbm of salt will be added, the total mass of the mixture before the salt and water are added is 3165 lbm.Since B2 is 4.5% salt, we can calculate the salt mass of B2 by multiplying 4.5 by the total mass of B2. Thus, the salt mass of B2 is 4.5 * 1582.5 lbm = 7162.5 lbm. Since we are given that 35 lbm of salt will be added, we can calculate the total mass of B2 before the salt and water are added by subtracting 35 lbm from 7162.5 lbm. Thus, the total mass of B2 before the salt and water are added is 7127.5 lbm. e B3 is 5.5% salt, we can calculate the salt mass of B3 by multiplying 5.5.
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According to regulations, the legal limit for arsenic in drinking water is 0.05 ppm. If you test a sample of 100 grams of drinking water and find 0.0012 grams of arsenic, is this within the legal limit? Show your calculations.
The concentration of arsenic in the water is 12 ppm, which is higher than the legal limit of 0.05 ppm, the sample of drinking water is not within the legal limit for arsenic. Therefore, action needs to be taken to reduce the level of arsenic in the water to make it safe for drinking.
The concentration of arsenic in the water can be calculated as follows:
Concentration (ppm) = (Mass of arsenic / Mass of water) x 1,000,000
In this case, the mass of arsenic is 0.0012 grams and the mass of water is 100 grams. Substituting these values into the formula, we get:
Concentration (ppm) = (0.0012 g / 100 g) x 1,000,000
Concentration (ppm) = 12 ppm
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Why does the product from the first part of the experiment turn red when sodium hydroxide is added? Select one: Red is the color of blood, and this lab is about testing for blood. The sodium hydroxide is a nucleophile and adds to the aromatic ring, The sodium hydroxide is reacting with one of the other reagents.The dianion can form a resonance-stabilized conjugated ring, which tends to absorb visible light Incorrect
The correct answer is: The dianion can form a resonance-stabilized conjugated ring, which tends to absorb visible light.
The correct answer is: The dianion can form a resonance-stabilized conjugated ring, which tends to absorb visible light.
In the first part of the experiment, the reagents used are benzidine and hydrogen peroxide, which react to form a compound called a dianion. This dianion is initially colorless, but when sodium hydroxide is added, it causes the dianion to undergo a rearrangement that forms a resonance-stabilized conjugated ring. This conjugated ring absorbs visible light in the blue-green range, which causes the solution to appear red. This color change is used as an indicator for the presence of blood in forensic and medical labs because benzidine and its derivatives are known to react with the heme group found in blood to form a similar colored proproductduct.
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1. a balloon
is filled with hydrogen at a temperature of 22.0°c and a pressure of
$12 mm hg. if the balloon's original volume was 1.25 liters, what will its new
volume be at a higher altitude, where the pressure is only 625 mm hg? assume
the temperature stays the same.
The new volume of the hydrogen-filled balloon at a higher altitude with a pressure of 625 mm Hg will be 6.25 L.
To solve this problem, we can use the gas law equation, which is P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Given the initial pressure P1 = 112 mm Hg, the initial volume V1 = 1.25 L, and the final pressure P2 = 625 mm Hg, we can calculate the final volume V2 by rearranging the equation:
V2 = (P1V1) / P2
V2 = (112 mm Hg × 1.25 L) / 625 mm Hg
V2 = 6.25 L
So, the new volume of the balloon at a higher altitude will be 6.25 liters, assuming the temperature remains constant at 22.0°C.
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2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) H = -850 J
1. How much energy would be released if 5. 2 moles of aluminum reacted with excess iron (III) oxide?
2. If you started this reaction with 4. 9g of aluminum, how much energy would be produced?
5.2 moles of aluminum reacting with excess iron (III) oxide would release 2210 J of energy and 4.9 g of aluminum reacting with excess iron (III) oxide would produce 38.5 J of energy.
To find out the amount of energy released when 5.2 moles of aluminum reacts with excess iron (III) oxide, we can use the given enthalpy change of the reaction and stoichiometry.
Using the balanced chemical equation,
2Al(s) + Fe₂O₃(s)→Al₂O₃(s) + 2Fe(s)
We can see that 2 moles of aluminum react with 1 mole of Fe₂O₃.
Now, we can calculate the energy released using the given enthalpy change,
ΔH = -850 J/2 moles Al × 5.2 moles Al = -2210 J
Therefore, the amount of energy released would be -2210 J. To calculate the amount of energy produced when 4.9 g of aluminum reacts with excess iron (III) oxide, we can first convert the given mass of aluminum to moles. The molar mass of aluminum is 26.98 g/mol, so the amount of moles of aluminum would be,
4.9 g Al × (1 mol Al / 26.98 g Al) = 0.181 mol Al
0.181 mol Al × (1mole Fe₂O₃/2moles Al)
= 0.0905 mol Fe₂O₃
Finally, we can calculate the energy produced using the given enthalpy change,
ΔH = -850 J/2 moles Al × 0.0905 moles Fe₂O₃ = -38.5 J. Therefore, the amount of energy produced would be -38.5 J.
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How many joules of energy do you release or lose to turn 460. g of nh3 from a liquid back to a solid?
The energy required to change 460 g of NH₃ from a liquid to a solid is roughly 152.86 kJ.
To calculate the energy released or lost when turning 460 g of NH₃ (ammonia) from a liquid to a solid, we need to determine the amount of heat energy involved in the phase transition. This can be done using the heat of fusion, which is the amount of heat energy required to convert a substance from a solid to a liquid or vice versa.
The heat of fusion of NH₃ is approximately 5.65 kJ/mol. We need to convert the mass of NH₃ to moles to use this value. The molar mass of NH₃ is 17.03 g/mol.
First, we calculate the number of moles of NH₃:
moles = mass / molar mass
moles = 460 g / 17.03 g/mol
moles ≈ 27.01 mol
Next, we calculate the energy released or lost:
energy = moles × heat of fusion
energy = 27.01 mol × 5.65 kJ/mol
energy ≈ 152.86 kJ
Therefore, approximately 152.86 kJ of energy would be released or lost when converting 460 g of NH₃ from a liquid to a solid.
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14 m3 of gas at a pressure of 3. 0 atmospheres is compressed into a volume of 9. 0 m3. Under what amount of pressure is the sample of gas after the compression?
The amount of pressure on the sample of gas after compression is 4.67 atm.
The initial volume and pressure of the gas are 14 m³ and 3.0 atm, respectively. After the gas is compressed, its volume becomes 9.0 m³. We can use the combined gas law to determine the final pressure of the gas:
[tex]P_1V_1 / T_1 = P_2V_2 / T_2[/tex]
where[tex]P_1, V_1,\ and\ T_1[/tex]are the Initial pressure, volume, and temperature of the gas, respectively, and [tex]P_2, V_2,\ and\ T_2[/tex] are the final pressure, volume, and temperature of the gas, respectively.
Assuming the temperature is constant, we can simplify the equation to:
[tex]P_2 = (P_1 * V_1) / V_2[/tex]
Substituting the given values, we get:
[tex]P_2[/tex] = (3.0 atm * 14 m³) / 9.0 m³
[tex]P_2[/tex]= 4.67 atm
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What set of coefficients will balance the chemical equation below:
___H2SO4 (aq) + ___NH4OH (aq) ---> ___H2O (l) + ___(NH4)2SO4 (aq)
A. 2,2,1,2
B. 1,2,2,1
C. 1,1,2,2
D. 1,3,2,1
The set of coefficients that will balance the chemical equation are: B.) 1, 2, 2, 1
What is meant by chemical reaction?Chemical reactions are processes that cause one set of chemical elements to change into another set of chemical elements. During chemical reaction, atoms are rearranged, bonds between atoms are broken and formed and then new compounds or molecules are produced.
Chemical reactions can be represented using the chemical equations, that show reactants and products.
The balanced chemical equation for the given reaction is: H₂SO₄ (aq) + 2NH₄OH (aq) ---> 2H₂O (l) + (NH₄)2SO₄ (aq)
Therefore, the set of coefficients that will balance the chemical equation are: 1, 2, 2, 1.
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HEAT
INTRODUCTION
Heat is a measure of the energy in a system. The transfer of energy is always from the system with more energy to the system with less energy. This lab has two distinct parts. In the first part, you will examine what happens to a gas when the temperature is changed. In the second part, you will use the idea of energy transfer to move water. You will need to be familiar with the ideas of phases (solid, liquid and gas), what specific heat is, and how to calculate joules. Please see pages 93-94, 99-101, and 106-110 in your textbook.
MATERIALS
1 small mouth (or small neck) bottle… a soda bottle should work
1 coin (dime or penny – must cover completely mouth of bottle)
1 large container to submerge at least ½ the bottle (sink, tub, bowl, etc.)
Enough cold water to submerge ½ the bottle
Measuring cups
Food coloring – in kit
4 cups water
1 large bowl to hold water – a clear glass one works best
1 small glass that will extend above water level when in bowl
Saran wrap/cling film – enough to cover bowl
1 small object (example: pebble, coin, marble)
Sunny days (3-4)
Lab 11 - Heat
Page 1 | 4
PART#1: Magic Coin?
Procedure:
Fill selected container with some cold water.
Place the bottle and coin in the bowl of water to chill them. The bottle must be submerged upside down. Submerge at least the neck of the bottle but if you have no “coin activity” on step four, repeat this step with either a greater amount of submersion or submerge the bottle for a greater amount of time.
Place the coin on the top of the bottle. There should be an airtight seal when you place the coin on the top of the bottle.
Wrap your hands around the bottle and wait for several seconds to a minute.
When you believe that the bottle is warmer than room temperature, allow the bottle to cool with the coin in place. Answer the following questions based on your observations.
Questions:
Approximately how long did you submerge the bottle in step #2?
What happened during step #4?
What happened during step #5?
Explain what is happening to the molecules to create the “coin activity”.
PART#2: Distillation
Procedure:
Add the water to the bowl.
Stir in the food coloring until it is distributed equally.
Place the empty glass (small) in the middle of the large bowl so that none of the
Lab 11 - Heat
Page 2 | 4
colored water can get into the glass. The glass must be short enough that it does not extend beyond the rim of the glass bowl.
Note: If the glass bowl is not working because the small empty glass is not stable, a stock pot/dutch oven (with a flat bottom) will work but it will need to be left alone for a little more time.
Cover the large bowl completely with the saran wrap so that no air can pass through.
Add the small object on the saran wrap so that the saran wrap dips in over the small empty glass but does not cause the saran wrap to slip off the lip of the bowl. Use a smaller pebble or coin if the first one is too heavy.
Leave the bowl in the sunlight for a few days and watch to see what happens.
Remove the small glass and measure the amount of water in it with the measuring cups (estimating to the nearest 1/8 cup). Contact me immediately if the amount of water in the small glass is less than 1/8 cup.
Questions:
How is the water in the large bowl different from the water in the small glass?
Describe step by step what happened to the water that is now in the small glass in terms of heating/cooling, phase changes, etc. (Hint: there is more than one step required)
How many cups of water (to the nearest 1/8 cup) are in the small glass?
How many grams of water did you collect?
The relationship between cups and grams is: 1 cup = 236 grams
How many calories are needed to heat the water?
Assume the following information:
The original temperature of the water in the large bowl was 25 °C.
The temperature of a molecule that changes from liquid to gas is 100 °C.
The specific heat of water is 1.00 cal/g·°C
Lab 11 - Heat
Page 3 | 4
You will need the equation for specific heat (equation 4.4)
How many calories are needed to evaporate the water?
The latent heat of vaporization of water is 540.0 cal/g
You will need equation 4.6 in the textbook.
How many calories (total) are needed to “move” the water from the large bowl to the small glass?
Notes: Ignore the amount of water that was not “moved” The water molecules must warm AND change state
Answer:
Hello! This lab is all about heat, which is a measure of energy in a system. In the first part, we'll be examining what happens to a gas when the temperature changes. For this part, you will need a small mouth bottle, a coin, a large container, cold water, and measuring cups. In the second part, we'll be using the idea of energy transfer to move water. For this part, you will need food coloring, water, a large bowl, a small glass, cling film, a small object, and sunny days. Follow the procedures carefully and answer the questions provided to understand the concepts of heat and energy transfer. Don't hesitate to reach out if you have any questions!
C water = 1 cal/g ℃
What change in volume results if 50.0 mL of gas is cooled from 48.0 °C to
3°C?
Answer:
-2.6 mL.
Explanation:
To solve this question, we need to use the formula:
V1/T1 = V2/T2
where V1 and T1 are the initial volume and temperature of the gas, and V2 and T2 are the final volume and temperature of the gas. We also need to convert the temperatures from degrees Celsius to kelvins by adding 273.15. Plugging in the given values, we get:
50.0 mL / (48.0 + 273.15) K = V2 / (3 + 273.15) K
Solving for V2, we get:
V2 = 50.0 mL x (3 + 273.15) K / (48.0 + 273.15) K V2 = 47.4 mL
Therefore, the change in volume is:
ΔV = V2 - V1 ΔV = 47.4 mL - 50.0 mL ΔV = -2.6 mL
The negative sign indicates that the volume decreases when the gas is cooled.
The answer is -2.6 mL.
How many moles of N2 are in a flask with a volume of 250mL at a pressure of 300. 0kPa and a temperature of 300. 0K?
There are approximately 0.0364 moles of N2 in the flask.
To calculate the number of moles of N2 in a flask with a volume of 250mL at a pressure of 300.0kPa and a temperature of 300.0K, we need to use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, we need to convert the volume from mL to L by dividing it by 1000: 250mL ÷ 1000 = 0.25L.
Next, we need to convert the pressure from kPa to atm by dividing it by 101.3 (which is the conversion factor between kPa and atm): 300.0kPa ÷ 101.3 = 2.96atm.
Now we can plug in the values and solve for n: n = (PV) / (RT) = (2.96atm x 0.25L) / (0.08206 L·atm/mol·K x 300.0K) = 0.0364 moles of N2.
Therefore, there are approximately 0.0364 moles of N2 in the flask.
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The alpha decay of what isotope of what element produces lead-206?.
The alpha decay of the isotope of the element produces lead-206 is the polonium (Po)- 210.
Alpha decay is the process, the alpha particles is the emitted when the heavier nuclei decays into the lighter nuclei. Then the alpha particle released has the charge of the +2 units.
The representation of the alpha decay is as :
[tex]X^{A}{z} }[/tex] ---> Y⁴₂ + α⁴₂
Y⁴₂ = Pb²⁰⁶₈₂
Z - 2 = 82
Z = 84
A - 4 = 206
A = 210
The atomic mass, A = 210
The atomic number, Z = 84
Therefore, the element is the polonium (Po) that has the atomic number is the 84 and the atomic mass is the 210.
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Given the reaction at equilibrium:
2 SO2(g) + O2(g) ↔ 2 SO3(g) + heat
The rate of the forward reaction can be increased by adding more SO2 because the
A) temperature will increase
B) forward reaction is endothermic
C) reaction will shift to the left
D) number of molecular collisions between reactants will increase
The addition of more [tex]SO2[/tex] to the reaction at equilibrium, [tex]2 SO2(g) + O2(g) ↔ 2 SO3(g) + heat[/tex], will increase the rate of the forward reaction. This is because the forward reaction is an exothermic reaction, meaning it releases heat. The correct answer is option d.
According to Le Chatelier's principle, adding more [tex]SO2[/tex] will shift the equilibrium position to the right and favor the forward reaction, leading to an increase in the concentration of the products, [tex]SO3[/tex].
As the concentration of [tex]SO3[/tex] increases, the rate of the forward reaction will increase due to an increase in the number of molecular collisions between reactants. Therefore, adding more[tex]SO2[/tex] will increase the rate of the forward reaction, favoring the production of [tex]SO3[/tex].
The correct answer is option d.
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A) What volume of concentrated nitric acid (15.8 M) is needed to prepare 5.0 L of a 2.5 M solution?
WILLLL GIVE BRAINLIEST!!!
Answer:
0.79 L of concentrated nitric acid is needed to prepare 5.0 L of a 2.5 M solution.
Explanation:
We can use the formula:[tex]M_1V_1 = M_2V_2[/tex]where [tex]M_1[/tex] is the concentration of the concentrated nitric acid, [tex]V_1[/tex] is the volume of concentrated nitric acid needed, [tex]M_2[/tex] is the desired concentration of the final solution, and [tex]V_2[/tex] is the final volume of the solution.Plugging in the given values, we get:[tex](15.8 \text{ M})(V_1) = (2.5 \text{ M})(5.0 \text{ L})[/tex]Solving for [tex]V_1[/tex], we get:[tex]V_1 = \frac{(2.5 \text{ M})(5.0 \text{ L})}{15.8 \text{ M}} \approx 0.79 \text{ L}[/tex]Therefore, approximately 0.79 L of concentrated nitric acid is needed to prepare 5.0 L of a 2.5 M solution.
Answer:
0.79 L
I hope this helps! Cheers ^^
How much heat is required to warm 400. g of ethanol from 25.0°c to 40.0°c
To calculate the amount of heat required to warm 400 g of ethanol from 25.0°C to 40.0°C, we need to use the following formula:
Q = m * c * ΔT
where Q is the amount of heat required, m is the mass of the substance, c is the specific heat capacity of ethanol, and ΔT is the change in temperature.
The specific heat capacity of ethanol is 2.44 J/(g·°C), and the change in temperature is:
ΔT = 40.0°C - 25.0°C = 15.0°C
Now we can use the formula to calculate the amount of heat required:
Q = 400 g * 2.44 J/(g·°C) * 15.0°C = 18360 J
Therefore, 18,360 J of heat is required to warm 400 g of ethanol from 25.0°C to 40.0°C.
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ASAP THIS IS DEW ON THE 4/26/2021!!!!!!! HELP
Assessment timer and count
Assessment items
Illustration of water cycle showing land and water body with arrows pointing outward and inward to both land and water body and some numeric labels one, two, three, and four mentioned along with arrows
Illustration of water cycle showing land and water body with arrows pointing outward and inward to both land and water body and some numeric labels one, two, three, and four mentioned along with arrows
Item 8
How do water particles move in a wave?
They move in a circular motion.
They move up and down.
They stay still.
They move forward with the wave
When a wave passes through water, the particles of water move in a circular motion, which is often described as an orbital motion.
The circular motion of water particles is created by the energy of the wave, which causes the water to oscillate up and down or back and forth in the same place.
As the wave moves through the water, the energy is transferred from particle to particle in a circular motion, causing the water to move in a wave pattern that travels outward from its source. This circular motion is why water waves do not carry water particles along with them, but rather simply transfer energy through the water.
This motion is also what creates the phenomena of waves breaking on shorelines, as the circular motion of water particles becomes disrupted by the shallow water and causes the wave to collapse.
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What is the rate of change of total pressure in the vessel during the reaction?.
The rate of change of total pressure in a vessel during a reaction depends on the stoichiometry of the reaction and the behavior of the reactants and products with respect to pressure.
In general, if the reaction involves the production or consumption of gases, the total pressure in the vessel will change as the reaction proceeds. The rate of change of total pressure can be calculated using the ideal gas law, which relates the pressure, volume, and temperature of a gas:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
If the number of moles of gas changes during the reaction, the pressure will change accordingly. The rate of change of pressure can be calculated using the following equation:
ΔP/Δt = (Δn/Δt)RT/V
where ΔP/Δt is the rate of change of pressure, Δn/Δt is the rate of change of the number of moles of gas, R is the ideal gas constant, T is the temperature, and V is the volume.
Therefore, to determine the rate of change of total pressure in a vessel during a reaction, it is necessary to know the stoichiometry of the reaction and the behavior of the reactants and products with respect to pressure.
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Which molecule has the shortest carbon-oxygen bond length?
A. CH3COOH
B. CH3CH2OH
C. CO₂
D. CO
3. Amari wants to set up a tent. He needs four 8 ft ropes. The package of ropes he bought from the store is 28 yards long. After setting up the tent, does Amari have any rope left over? If so, how much?
Answer: yes there is rope left over. 52ft of rope.
Explanation:
there are 3 ft in a yard so Amari has
3ft x 28yards = 84ft of rope
he needs 4 x 8ft = 32ft of rope
subtract what he needs from what he has to find out if he has enough and how much extra.
84ft - 32ft = 52ft of extra rope
Use S1/P1 = S2/P2 , the solubility of a gas is 2. 36 g/L at a pressure of 345 atm. What is the solubility if the pressure increases to 445 atm at the same temperature?
To calculate the solubility of a gas when the pressure increases, the ideal gas law can be used. According to the law, the solubility of a gas is inversely proportional to pressure, meaning that as the pressure increases, the solubility decreases. T
herefore, if the pressure increases from 345 atm to 445 atm, the solubility will decrease.
Using the equation S1/P1 = S2/P2, the new solubility can be calculated. The equation can be rearranged to S2 = (S1 x P2) / P1. Plugging in the given values, the new solubility at 445 atm is 1.97 g/L. This is a decrease of 0.39 g/L.
In conclusion, when the pressure of a gas increases, its solubility decreases. Using the ideal gas law, the new solubility can be calculated using the equation S2 = (S1 x P2) / P1. In this case, the solubility of a gas decreased from 2.36 g/L to 1.97 g/L when the pressure increased from 345 atm to 445 atm.
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What is correlation coefficient vs coefficient of determination?
The correlation coefficient and the coefficient of determination are two statistical terms that are often used to measure the relationship between two variables.
The correlation coefficient, also known as Pearson's correlation coefficient (r), is a measure of the strength and direction of the linear relationship between two variables. It ranges from -1 to 1, where -1 indicates a strong negative relationship, 1 indicates a strong positive relationship, and 0 indicates no relationship.
To calculate the correlation coefficient, you will need to find the covariance of the variables, as well as their standard deviations, and then divide the covariance by the product of the standard deviations.
On the other hand, the coefficient of determination (R²) is a measure of how much of the variance in one variable can be explained by the variance in another variable. It is the square of the correlation coefficient and ranges from 0 to 1.
A value of 0 indicates that none of the variance in the dependent variable can be explained by the independent variable, while a value of 1 indicates that 100% of the variance can be explained.
In summary, the correlation coefficient is a measure of the strength and direction of the relationship between two variables, while the coefficient of determination measures the proportion of variance in one variable that can be explained by the other variable.
Both of these coefficients are essential in understanding the relationship between variables and can be used to make predictions in various fields, such as finance, social sciences, and natural sciences.
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Consider the following acid and bases HCO2H ka = 1. 8 x 10^-4
HOBr Ka = 2. 0 x 10^-9
(C2H5)2NH kb = 1. 3 x 10-3
HONH2 kb = 1. 1 x 10^-8
choose sobstances to create ph = 4 buffer solutions:
select all tha apply
HONH3NO3
HOBr
NaOBr
(C2H5)2NH2Cl
(C2H5)2NH
HCO2H
KHCO2
HONH2
The substances that can create a pH = 4 buffer solution are HCO₂H and KHCO₂.
When modest quantities of acid or base are added to a buffer solution, it resists changes in pH. In order to create a buffer solution, we need to have a weak acid and its conjugate base, or a weak base and its conjugate acid, in roughly equal amounts.
HCO₂H is a weak acid with a pKa of 3.74, and its conjugate base is HCO₂⁻. KHCO₂ is the potassium salt of HCO₂⁻, and it acts as a source of HCO₂⁻ ions, making it a good buffer component.
The other substances listed are not suitable for creating a pH = 4 buffer solution because they either do not have a pKa or pKb near 4, or they are neither a pair of a weak acid and its conjugate base, or a pair of a weak base and its conjugate acid..
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