To determine the (gt-l) strength of an HCl solution: HCI Strength = HCI Molarity HCI -M mol wt. 36,5 Result: HCl solution molarity HCl solution strength = 2.
Can you determine the endpoint of a titration?We know the volume of acid (which we took originally) and the volume of base (which we recorded at the endpoint), as well as the concentration of base, so we can compute the concentration of acid. As a result, the endpoint of an acid-base titration is measured by a change in colour. Titration is a volumetric measurement.
The pH of the solution generated by adding one drop of 2 M HCl to 100 mL of water would thus be 3.
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A balloon originally has 0.100 moles of helium and has a volume of 0.500 L. If 0.510 grams of He are added to the balloon, what will the new volume be, in L? (Assume temperature and pressure do not change.)
The new volume of the helium gas is 0.39 L.
What is the new volume of the helium gas?The new volume of the helium gas is calculated by applying the following formula as shown below:
n₁V₁ = n₂V₂
where;
n₁ is the initial number of molesn₂ is the final number of molesV₁ is the initial volumeV₂ is the final volumethe final number of moles is calculated as;
n₂ = 0.51 g/4 g/mol
n₂ = 0.1275 mol
The final volume of the gas;
V₂ =(n₁V₁)/n₂
V₂ = (0.1 x 0.5 L )/ (0.1275)
V₂ = 0.39 L
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A mass of 1.71 g pure barium hydroxide is transferred quantitatively to a 250 cm3
volumetric flask and made up to the mark with distilled water. Using a pipette, 25.0 cm3
of the barium hydroxide solution are placed in a conical flask and a few drops of methyl
orange indicator are added. Hydrochloric acid is added slowly from a burette until the
endpoint is reached. The titre value is 12.6 cm3
What will the colour change of the indicator at the endpoint be?
The methyl orange indicator will change from red to yellow at the titration's endpoint.
How can the color of the indicator's change at the terminus be determined?An acid-base indicator called methyl orange changes color between the pH ranges of 3.1 and 4.4. In acidic and basic solutions it is red and yellow, respectively
In this instance, an acid, hydrochloric acid, is being used to titrate the barium hydroxide solution. The pH of the solution will fall as we add the acid since it will neutralize the base. The hue of the methyl orange indicator will vary when the pH ranges from 3.1 to 4.4
All of the barium hydroxide will have interacted with the hydrochloric acid by the time the titration is complete leaving a neutral solution. When the methyl orange indicator becomes yellow the solution's pH is in the basic range.
Therefore, the methyl orange indicator will change from red to yellow at the titration's endpoint.
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The volume of a given gas is
Vem? P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature?
Answer: the new volume of the gas is twice the initial volume when the pressure is reduced to half at constant temperature.
Explanation:
conclusion of solution and filteration of organic compounds method
Filtration is the process of passing a liquid containing contaminants through a filter to get a cleaner liquid.
What can you conclude after learning about filtration of solutions of organic compounds?After filtration impurities are left on the filter when the liquid goes through it, resulting in a cleaner combination. The procedure of separating one ingredient from another in a compound is used in the purification of chemical compounds or any materials. A mixed sample is turned into fresh samples, each of which contains a single ingredient.Separation procedures are then utilised to separate these compounds. These techniques alter the relative proportions of components in a combination.The type of the compounds and the impurities in them influence the purification of organic chemicals and compounds.
Purification of compounds can be done in other methods as well such as distillation, chromatography, sublimation and crystallisation.
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Full question:
What can you conclude after learning about filtration of solutions of organic compounds? Name other methods of purification of compounds.
How many moles of Sb,03 will be formed when you have 20.0 moles of oxygen gases?
20.0 moles of oxygen react with Antimony to form 13.3 moles of Antimony (III) Oxide. We want to calculate how many moles of Antimony (III) Oxide will be formed from 20.0 moles of oxygen. This is a stoichiometry problem.
What is stoichiometry?The link between the proportional amounts of components participating in a reaction or generating a compound is known as stoichiometry, and it is often expressed as a ratio of whole integers.
Assuming a balanced chemical equation, the stoichiometric ratio between Antimony (III) Oxide and oxygen can be used to determine the number of moles of Antimony (III) Oxide formed.
For example, the balanced equation for the reaction of Antimony with O2 to form Antimony (III) Oxide is:
4 Antimony + 3 O2 → 2 Antimony (III) Oxide
From this equation, it can be seen that 3 moles of oxygen react with 2 moles of Antimony (III) Oxide . Therefore, if there are 20.0 moles of O2, then the number of moles of Antimony (III) Oxide formed would be:
20.0 moles oxygen × (2 moles Antimony (III) Oxide / 3 moles oxygen) = 13.3 moles Antimony (III) Oxide.
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if 0.80 moles of acetic acid are allowed to react with 0.65 moles of sodium bicarbonate , what is the limiting reactant? how many moles of CO2 can be produced? dimensional analysis
Sodium bicarbonate is the limiting reactant and just 0.65 moles of CO₂ can be produced.
What is meant by limiting reactant?Limiting reactant is the reactant that gets consumed completely in a chemical reaction, thereby limiting the amount of product that can be formed.
Acetic acid and sodium bicarbonate react, and the balanced chemical equation for this reaction is:
CH₃COOH + NaHCO₃ -> CH₃COONa + CO₂ + H₂O
Calculating the quantity of product that can be created from each reactant and comparing them to discover which one generates the least will help us identify the limiting reactant. The reactant that produces less product is the limiting reactant.
The provided amounts of each reactant must first be converted to moles:
0.80 moles of acetic acid
0.65 moles of sodium bicarbonate
Then, we may determine how much CO₂ can be created from each reactant using stoichiometry. The balanced equation reveals that 1 mole of acetic acid and 1 mole of sodium bicarbonate combine to create 1 mole of carbon dioxide.
Using acetic acid:
0.80 moles CH₃COOH x (1 mole CO₂ / 1 mole CH₃COOH) = 0.80 moles CO₂
About sodium bicarbonate:
0.65 moles NaHCO₃ x (1 mole CO₂ / 1 mole NaHCO₃) = 0.65 moles CO₂
As 0.65 moles of CO₂ are fewer than 0.80 moles of CO₂, sodium bicarbonate is the limiting reactant. Just 0.65 moles of CO₂ can be produced as a result.
Dimensional analysis:
0.80 moles CH₃COOH x (1 mole CO₂ / 1 mole CH₃COOH) x (44.01 g CO₂ / 1 mole CO₂) = 35.21 g CO₂
0.65 moles NaHCO₃ x (1 mole CO₂ / 1 mole NaHCO₃) x (44.01 g CO₂ / 1 mole CO₂) = 28.61 g CO₂
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Benzoic acid (C6H5COOH) and aniline (C6H5NH2) are both derivatives of benzene. Benzoic acid is an acid with Ka=6.3×10^(−5) and aniline is a base with Kb=4.3×10^(−10) .What is the value of the equilibrium constant for the following equilibrium? C6H5COOH(aq)+C6H5NH2(aq)⇌C6H5COO− (aq) +C6H5NH3(aq)
i want an accurate answer
Answer:
Explanation:
The equilibrium constant expression for the given reaction is:
K = ([C6H5COO-][C6H5NH3+])/([C6H5COOH][C6H5NH2])
We can use the acid dissociation constant (Ka) for benzoic acid and the base dissociation constant (Kb) for aniline to solve for the equilibrium constant (K) of the reaction.
Ka = [C6H5COO-][H3O+]/[C6H5COOH]
[H3O+] = Ka*[C6H5COOH]/[C6H5COO-]
Kb = [C6H5NH3+][OH-]/[C6H5NH2]
[OH-] = Kb*[C6H5NH2]/[C6H5NH3+]
Substituting [H3O+] and [OH-] into the equilibrium constant expression and simplifying, we get:
K = (Ka*Kb)/([H3O+][OH-])
K = (6.3×10^(-5))(4.3×10^(-10))/((KaC6H5NH2)(KbC6H5COOH))
K = (6.3×10^(-5))*(4.3×10^(-10))/(1.00×10^(-14))
K = 2.73×10^(-2)
Therefore, the equilibrium constant for the given reaction is 2.73×10^(-2).
A 7.95 L
container holds a mixture of two gases at 25 °C.
The partial pressures of gas A and gas B, respectively, are 0.352 atm
and 0.715 atm.
If 0.240 mol
of a third gas is added with no change in volume or temperature, what will the total pressure become?
The total pressure in the container will become 4.02 atm when 0.240 mol of a third gas is added.
How to find the total pressureIn accordance with Dalton's law of partial pressures:
P_total = P_A + P_B = 0.352 atm + 0.715 atm = 1.067 atm
When 0.240 mol of a third gas is further introduced, the overall number of moles of gas in the vessel jumps to:
n_total = n_A + n_B + n_3 = (P_A * V)/(R * T) + (P_B * V)/(R * T) + n_3
for no change in volume
n_total = (P_total * V)/(R * T) + n_3
P_total = (n_total - n_3) * (R * T)/V
Substituting the given value:
P_total = (0.352 + 0.715 + 0.240) * (0.0821 * (25 + 273.15))/7.95
P_total = 1.307 x 3.079
P_total = 4.024 atm
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A solution containing 113. g of KCl in 270. g of H2O at 50 ∘C is cooled to 20 ∘C . It goes to 34 degrees Celsius when cooled down.
The solution of KCl in water will undergo precipitation of KCl crystals as the temperature decreases from 50 °C to 20 °C and then to 34 °C due to the decreasing solubility of KCl in water.
What happens to a solution of KCl in water when cooled from 50 °C to 20 °C and then to 34 °C?
When the solution of KCl in water is cooled from 50 °C to 20 °C, the solubility of KCl in water decreases. As a result, some of the KCl will start to come out of the solution and form solid crystals.
Then, when the temperature of the solution is further decreased from 20 °C to 34 °C, the solubility of KCl in water decreases even further, causing more KCl to come out of the solution and form solid crystals. This is known as precipitation.
The amount of KCl that will come out of the solution depends on the solubility of KCl at the respective temperatures. The solubility of KCl in water is about 34 g/100 mL at 20 °C and about 42 g/100 mL at 34 °C. Therefore, when the solution is cooled from 50 °C to 20 °C, some KCl will come out of solution until the concentration in solution reaches about 34 g/100 mL. Further cooling to 34 °C will cause more KCl to come out of solution until the concentration in solution reaches about 42 g/100 mL.
The exact amount of KCl that will come out of solution can be calculated using thermodynamic models and experimental data on the solubility of KCl in water at different temperatures.
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How do you calculate the mass of an atom of silver? Need to have this answer in 7th grade terms,
Answer:
To calculate the mass of an atom of silver, we need to know the number of protons and neutrons in the nucleus of the atom. The atomic number of silver is 47, which means it has 47 protons in its nucleus. The mass number of silver is 108, which means that the total number of protons and neutrons in its nucleus is 108. Therefore, the mass of an atom of silver is approximately 108 times the mass of a single proton or neutron. This is because the mass of an electron is much smaller than the mass of a proton or neutron and can be neglected. The mass of a single proton or neutron is approximately 1 atomic mass unit (amu), so the mass of an atom of silver is approximately 108 amu.
Help pls!!
20 points and I’ll mark brainliest!
Calculate the boiling and freezing points of a 36.0 % by mass Na3PO4 solution.
Consider the equilibrium of methanol vapor and the liquid.
CH₂OH(1) CH₂OH(g)
What is the vapor pressure of the methanol at -30 °C?
What is the vapor pressure of the methanol at 40 °C?
Thermodynamic Table at 25 °C
Substance AH; (kJ/mol) S (J/mol-K) AG; (kJ/mol)
CH₂OH(1)
126.8
CH₂OH(g)
239.9
Pvap 5
Pap
=
=
-239.2
-201.0
-166.6
-162.3
atm
atm
The vapor pressure of methanol at 40°C is 0.234 atm.
What distinguishes ethanol from methanol?Only two types of alcohol are methanol and ethanol. Ethanol, sometimes referred to as ethyl alcohol, has a chemical composition of two carbon atoms. Methanol, sometimes referred to as methyl alcohol, is made up of just one carbon atom.
ln(P2/P1) = (ΔHvap/R) x (1/T1 - 1/T2)
ΔGvap = -RTln(Pvap/P) = ΔHvap - TΔSvap
ΔGvap = -RTln(Pvap/P) = -166.6 kJ/mol
ΔSvap = S(g) - S(l) = 239.9 J/mol-K - 126.8 J/mol-K = 113.1 J/mol-K
ΔHvap = ΔGvap + TΔSvap = -166.6 kJ/mol + (298.15 K)(113.1 J/mol-K) = -134.6 kJ/mol
Now we can use the Clausius-Clapeyron equation to find the vapor pressure of methanol at -30°C and 40°C.
At -30°C, we have:
T1 = 25°C + 273.15 = 298.15 K
T2 = -30°C + 273.15 = 243.15 K
ΔHvap = -134.6 kJ/mol
R = 8.314 J/mol-K
ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/243.15 K)
P2 = 0.0038 atm
Therefore, the vapor pressure of methanol at -30°C is 0.0038 atm.
At 40°C, we have:
T1 = 25°C + 273.15 = 298.15 K
T2 = 40°C + 273.15 = 313.15 K
ΔHvap = -134.6 kJ/mol
R = 8.314 J/mol-K
ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/313.15 K)
P2 = 0.234 atm
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If I have 6.5 liters of a gas in a ballon at a pressure, of
1.35 atm and compess the gas until its volume is 4.6,
what will the new pressure inside the ballon be?
Round your answer to 2 decimal places!
The new pressure inside the balloon will be 1.91 atm after the gas is compressed to a volume of 4.6 L.
What is the formula for the pressure law?The scientist Robert Boyle discovered this empirical relationship in 1662, which asserts that under constant temperature, the pressure (p) of a given quantity of gas changes inversely with its volume (v). As a result, the equation pv = k, a constant, is produced.
P1 x V1 = P2 x V2
where the starting pressure and volume are P1 and V1, and the ultimate pressure and volume are P2 and V2.
Plugging in the given values, we get:
1.35 atm x 6.5 L = P2 x 4.6 L
Solving for P2, we get:
P2 = (1.35 atm x 6.5 L) / 4.6 L
P2 = 1.91 atm
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The [H3O+] of a solution with pH = 9.7 is
A solution with a pH of 9.7 contains the hydronium ion. [tex]1x10^-9.7[/tex]M, which is equivalent to approximately [tex]2.01x10^-10 M.[/tex]
Is pH a measure of Hydronium ion?You must be aware of the hydronium ion concentration expressed in moles per litre (molarity) in order to calculate the pH of an aqueous solution. The pH is then calculated using the equation pH = - log [H3O+].
Why pH is only 1 to 14?At the far end, there are no more than 1M hydrogen ions, which leads to a pH of no more than 0. The pH value is limited to 14, whereas the other end contains no more than 1M of hydroxide ions.
Question:
[tex]The [H3O+] of a solution with pH = 9.7 is 9.7 M O 1x 109.7M O2 x 10-10 M O 5 x 10-5M 09.7 x 10-1 M The [H3O+] of a solution with pH = 9.7 is 09.7 M O 1x 109.7 M 2 x 10-10 M. 0 5x 10-5m 09.7 10-1 M.[/tex]
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What is the percent composition of each element in Prussian Blue?
The percent composition of iron, carbon, and nitrogen in Prussian Blue is approximately 56.27%, 15.38%, and 28.35%, respectively. The exact percentage of hydrogen depends on the value of x in the formula.
What proportion of each ingredient is there?When evaluating a chemical complex, knowing the percentage composition of a certain element inside it may be helpful. The formula for percent composition is 100 times the product of the element's mass and its molecular mass.
What proportion of Fe is present in siderite?It is free of sulphur and phosphorus and contains 48% iron. Siderite-smithsonite, siderite-magnesite, and siderite-rhodochrosite are solid solutions formed when zinc, magnesium, and manganese are substituted for iron.
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what volume of a 60.0% solution by mass is made with 45.0g of solute
The volume of a 60% solution by mass that is prepared with 45 grams of a particular solute is 75 mL.
How do you calculate the volume of a 60.0% solution made with 45.0g of solute?Firstly, to calculate the volume of the solution, we need to know the density of the solution. Since it is not mentioned in the question, we can assume it to be 1 g/ml.
Next, we can use the formula:
mass of solute = (mass of solution) x (percent by mass)
Here, the mass of solution is the mass of solute plus the mass of solvent.
Or, the mass of solute + the mass of solvent = the mass of solution
Therefore,
The mass of solvent = the mass of solution - the mass of solute
Substituting the values provided in the question, we get:
mass of solvent = (45) / (0.6) - 45 (since the solution is 60%)
mass of solvent = 75 - 45 = 30 g
Thus, mass of the solvent = 30g
Since volume = mass / density
The volume of the 60% solution = mass of solution / density
volume of solution = (45 + 30) / (1)
volume of solution = 75 mL
Thus, 75 mL of the 60% solution by mass is made with 45g of solute.
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Name four types of physical weathering. How are they similar?
for 13 points
The four types of physical weathering are:
1.) Frost action or freeze-thaw weathering
2.) Exfoliation or unloading
3.) Thermal expansion and contraction
4.) Abrasion
These types of weathering are similar in that they all involve physical processes that break down rocks and other geological materials without the involvement of chemical reactions.
Frost action occurs when water seeps into cracks in rocks and freezes, causing the water to expand and exert pressure on the surrounding rock. This process repeats over time and can cause the rock to fracture and break apart.
Exfoliation occurs when rocks that were once buried deep beneath the earth's surface are exposed to lower pressures as overlying rocks erode away. As the pressure decreases, the rocks expand and crack, causing outer layers of rock to peel away like layers of an onion.
Thermal expansion and contraction occurs when rocks are repeatedly subjected to heating and cooling cycles. This can cause the rock to expand and contract, leading to the development of cracks and fractures.
Abrasion occurs when rocks and other geological materials are subjected to repeated rubbing or grinding by other materials, such as wind-blown sand, water, or other rocks. This process can cause rocks to wear down and break apart over time.
In summary, these four types of physical weathering are similar in that they all involve physical processes that break down rocks and other geological materials, but each type operates under different conditions and results in different forms of weathering.
Answer:
below
Explanation:
The four types of physical weathering are:
1. Freeze-thaw weathering
2. Exfoliation
3. Abrasion
4. Thermal expansion and contraction
These types of physical weathering are similar in that they all involve the breakdown of rocks and other geological features due to physical forces rather than chemical reactions. In each case, the physical stress causes the rock to crack or break apart. Additionally, they all can occur in various types of climates and environmental conditions.
5.82 x 10^6 atoms of water, H₂O, reacts with Na2O2, how many liters of sodium hydroxide,
NaOH can be formed?
5.82 x 10⁶ atoms of H₂O can produce 72800 L of NaOH.
What happens when H₂O₂ and NaOH react?An exothermic mist from the commencement of high temperatures and heat from the breakdown of incompatible combinations can emerge from the reaction of NaOH with H₂O₂, which creates a powerful oxidant known as Na₂O₂ and poses a serious thermal danger.
5.82 x 10⁶ atoms / 3 atoms per mole = 1.94 x 10⁶ moles of H₂O
1.94 x 10⁶ moles of H₂O x (4 moles of NaOH / 2 moles of H₂O) = 3.88 x 10⁶ moles of NaOH
To convert moles of NaOH to liters, we need to use the density of NaOH and its molar mass. The molar mass of NaOH is:
23 g/mol (for Na) + 16 g/mol (for O) + 1 g/mol (for H) = 40 g/mol
The density of NaOH is 2.13 g/mL. Using these values, we can calculate the volume of NaOH produced:
3.88 x 10⁶ moles of NaOH x 40 g/mol = 1.55 x 10⁸ g of NaOH
1.55 x 10⁸ g / 2.13 g/mL = 7.28 x 10⁷ mL
7.28 x 10⁷ mL / 1000 mL/L = 72800 L
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I need help with this
As a result, the ideal gas law is applied, and the pressure of the gas in the container is 1.44 atm.
How does Charles Law compute pressure?The Kelvin temperature and hence the volume are going to be in direct proportion when the pressure on a sample of a dry gas is held constant, according to the definition of the Charles Law Formula. PV = k is the law's equation, and k might be a constant.
This issue can be resolved by applying the ideal gas law:
PV = nR
T = -52 °C + 273.15 = 221.15 K
n = 0.642 mol
V = 8.6 L
T = 221.15 K
[tex]R = 0.0821 L·atm/mol·K (gas constant for ideal gases)[/tex]
PV = nRT
P = nRT/V
P = (0.642 mol)(0.0821 L·atm/mol·K)(221.15 K)/(8.6 L)
P = 1.44 atm
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Someone help me do a CER on A lunar eclipse that can be photographed sometimes when Earth is in between the sun and the Moon. 5 sentences
No definitions
No Go*gle
Answer: A terrestrial phenomenon commonly referred to as lunar eclipse transpires during an astronomical event wherein the Earth traverses its orbit between the Sun and the Moon, resulting in an obstruction and projection of its shade onto the lunar surface. During a lunar eclipse, the moon may exhibit a crimson tint owing to the Earth's atmosphere refracting sunlight towards the moon. This phenomenon is commonly referred to as a "blood moon" in academic discourse. The acquisition of photographic images of lunar eclipses necessitates the utilization of a camera and a tripod. However, it is imperative to exercise care with respect to exposure duration and ISO settings to facilitate the capture of the subdued illumination emitted by the eclipsed moon. An upcoming celestial phenomenon, which is anticipated to be observable from Earth, is the occurrence of a lunar eclipse on May 16, 2022.
Explanation:
a ___ weather front forms when a warm air mass pushes into a cooler air mass
a) cold
b) warm
c) stationary
Answer:
b) warm
Explanation:
A warm weather front forms when a warm air mass pushes into a cooler air mass. Therefore, the answer is b) warm.
I'm sorry to bother you but can you please mark me BRAINLEIST if this ans is helpfull
0.4800 g of a mixture that is 80.0% by mass sodium carbonate and 20.0% by mass sodium hydroxide reacts with 35.00 ml of hydrochloric acid. carbon dioxide is detected as one of the products. a) what is the normality of the hydrochloric acid? b) what is the molarity of the hydrochloric acid?
Formula for lead (lll)oxide
Answer:Pb2O3
Explanation:
lead (III) has a +3 charge
Oxygen has a -2 charge
You need 2 Pb to balance with the 3
Whales have one of the longest gestation periods of any mammal. According to a website, the mean gestation period for a whale is 15 months. Assume the distribution of gestation periods is Normal with a standard deviation of 1.1
months
a. Find the standard score associated with a gestation period of 13.9 months.
b. Using the Empirical Rule and your answer to part a, what percentage of whale pregnancies will have a gestation period between 13.9 and 15 months?
c. Would it be unusual for a whale to have a gestation period of 19 months? Why or why not?
a. A gestation period of 13.9 months has a standard score of -1.36.
b. Approximately 99.7% will fall within three standard deviations of the mean.
c. A gestation period of 19 months is very unlikely to occur in a normal distribution, and it would be considered unusual.
What is standard score?
a. To find the standard score associated with a gestation period of 13.9 months, we use the formula:
z = (x - μ) / σ
where x is the gestation period, μ is the mean gestation period, and σ is the standard deviation. Plugging in the values given, we get:
z = (13.9 - 15) / 1.1 = -1.36
Therefore, a gestation period of 13.9 months has a standard score of -1.36.
Empirical Rule:
b. Using the Empirical Rule, we know that approximately 68% of the gestation periods will fall within one standard deviation of the mean, approximately 95% will fall within two standard deviations of the mean, and approximately 99.7% will fall within three standard deviations of the mean.
Since we found the standard score in part a, we can use it to calculate the percentage of whale pregnancies that will have a gestation period between 13.9 and 15 months. This gestation period range is within one standard deviation of the mean, so we can say that approximately 68% of whale pregnancies will fall within this range.
What is gestation period?
c. A gestation period of 19 months is more than three standard deviations away from the mean gestation period of 15 months. Using the Empirical Rule, we can say that approximately 99.7% of the gestation periods will fall within three standard deviations of the mean. Therefore, a gestation period of 19 months is very unlikely to occur in a normal distribution, and it would be considered unusual.
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Which of the following is true about a compound and its elements?
The same components always present the same ratios in a compound. Water always has two hydrogen atoms for oxygen, and carbon dioxide always contains two oxygen atoms for every one of carbon.
Which of the following claims regarding an element is untrue?Considering that each of them is composed of two similar atoms, elements include hydrogen, oxygen, and nitrogen. Water is not an element since it only contains two hydrogen atoms and one oxygen atom.
Do elements and compounds both consist of pure substances?Pure substances include both elements and compounds. Substances made up of many atom types are known as compounds. The simplest compounds are called elements because they only contain one kind of atom.
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Match the label to the correct description.
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
ball-and-stick model advantage
ball-and-stick model disadvantage
space-filling model advantage
space-filling model disadvantage
We can see here that matching the label to the correct description, we will have to have a complete part of the description and have a full understanding of what ball-and-stick model is all about.
A specific kind of molecular model called the ball-and-stick model uses balls to represent atoms and sticks to represent the connections connecting them to depict the three-dimensional structure of molecules.
It is a physical model that enables researchers to see the configuration of atoms within a molecule and comprehend their interrelationships.
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In a standard Normal distribution, if the area to the left of a z-score is about 0. 1500, what is the approximate z-score?
Draw a sketch of the Normal curve, showing the area and z-score
Z=
(Round to two decimal places as needed.)
The value of (approximate) z-score for an area of 0.1500 to the left of the z-score in a standard normal distribution is approximately -1.04.
How do you arrive at the standard normal distribution?If the area to the left of a z-score is 0.15 this means that 15% of the area under the standard normal distribution curve is to the left of the z-score. To find the approximate z-score, we can use a table of standard normal probabilities or a calculator that has a normal distribution function.
Using a standard normal distribution table, we can look up the closest probability to 0.15 in the table, which is 0.1492. The corresponding z-score is approximately -1.04.
This is how you arrive at the approximate z-score for an area of 0.1500 to the left of the z-score in a standard normal distribution which is approximately -1.04.
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what subshell has quantum numbers n =2 and l = 2?
The subshell with quantum numbers n=2 and l=2 is the 2D subshell.
What is quantum number?The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers.
There are four known quantum numbers, and they include:
principal, azimuthal, magnetic and spin quantum numbers.The principal quantum number (n) indicates the energy level or shell of an electron, while the azimuthal quantum number (l) indicates the shape of the electron cloud or subshell.
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show work please energy units conversion
The answers to the given questions are; 58 Joules = 13.86 Calories, 230 Calories = 962.32 Joules, 230 Calories = 0.96 kJ, and 3.2 kJ = 0.7648 kCal.
(i) We know that, 4.184 Joules = 1 Calorie
==> 1 Joule = 1 / 4.184 Calories
Therefore, 58 Joules = [ (1 / 4.184) * 58 ] Calories
= 13.86 Calories (Approx.)
(ii) We know, 1 Calorie = 4.184 Joules
Then, 230 Calories = 4.184 * 230 Joules
= 962.32 Joules
(iii) We know, 230 Calories = 962.32 kJ(from previous question)
and, 1000Joules = 1 kJ
==> 1 Joule = (1 / 1000) kJ
Therefore, 230 Calories i.e., 962.32 Joules = [ (1 / 1000) * 962.32 ] kJ
= 0.96kJ (Approx.)
(iii) We know, 4.184 Joules = 1 Calorie
==> 1 Joule = (1 / 4.184) Calorie
==> 1000Joules i.e, 1 kJ = (1 / 4.184) * 1000 Calories
Therefore, 3.2 kJ = [ { ( 1 / 4.184 ) * 1000 } * 3.2 ] Calories
= 764.82 Calories(Approx.)
Since, 1000 Calories = 1 kCal
764.81 Calories = [(1 / 1000) * 764.82 ] kCal
i.e., 3.2 kJ = 0.7648 KCal (Approx.)
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A student calculates the density of five different pieces of aluminum, each having a different volume.
Which graph best represents this relationship?
AN
KLEO
Volume
(A)
Volume
(B)
Volume
(C)
Volume
(D)
A student calculates the density of five different pieces of aluminum, each having a different volume Volume vs Density graph best represents this relationship.
What is Volume?Volume is the measure of an object's three-dimensional space. It is often referred to as the capacity of a container, or the amount of space an object occupies. Volume is measured in cubic units such as cubic centimeters (cm3), cubic meters (m3), or cubic feet (ft3). Volume is an important concept in mathematics and is used to calculate the amount of material an object is made from, the capacity of a container, and the amount of space a figure occupies. Volume is also used to calculate the amount of liquid, gas, or other material that can fit into a container.
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