Answer:
[tex]H_{rxn}=-34.36\frac{kJ}{mol}[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to realize that the heat released by the reaction is used up to heat up the mixture, which means we can write:
[tex]-Q_{rxn}=Q_{sol}[/tex]
Whereas the Q of solution is given by the total mass (3.644+42.054), the specific heat of the solution and the change in temperature; thus, we obtain:
[tex]-Q_{rxn}=(3.644g+42.054g)*4.18\frac{J}{g\°C}*(36.2\°C-27.8\°C)\\\\ Q_{rxn}=-1604.55J[/tex]
Next, by computing the moles of the solute, we can proceed to compute the kJ/mol for the enthalpy of reaction (dissolution):
[tex]n=\frac{3.644g}{78.01g/mol}=0.0467mol\\\\H_{rxn}=\frac{Q_{rxn}}{n}\\\\ H_{rxn}=\frac{-1604.55J}{0.0467mol}*\frac{1kJ}{1000J}\\\\ H_{rxn}=-34.36\frac{kJ}{mol}[/tex]
Best regards!
If the temperatures were raised slowly under the same conditions, would ice made from fresh water or sea water melt first? Which would boil first? Which of these would allow the temperature of an ice cream maker to drop below 0°C? Which requires colder temperatures to freeze, unsalted roads or salted roads? Which requires more heat to boil, pure water or a sugar solution used for making candy?
Answer:
1.sea water 2.fresh water 3. Salt and ice
4.salted roads 5. Sugar solution used for making candy
Explanation:
Because Truck
Answer:
salted roads
sugar something
pure water
Explanation:
trust me bro
7. Which of the following is a proof that light travels in a straight line?
A. Formation of clouds
C. Formation of rainbows
B. Formation of colors
D. Formation of shadow
Answer:
formation of shadow is right
Answer:
correct answer is D
Explanation:
When you see a shadow, it is directly behind the object.
help now im not trying to fail
Answer:
i cant see the whats in the picture
The analysis in this experiment assumes that CO2 is an ideal gas. Select the answer below that best explains if CO2 is an ideal gas and why. Group of answer choices CO2 is an ideal gas; this is because it is polar. CO2 is not an ideal gas; while it is nonpolar, the molecules do attract and repel each other, they also take up space- two characteristics that an ideal gas does not have. CO2 is not an ideal gas; it is polar, the molecules strongly attract and repel each other, they also take up space- two characteristics that an ideal gas does not have. CO2 is an ideal gas; this is because it is nonpolar.
What are 2 comparisons between organisms and music?
Help me fast I put 98 points pls help me no links I am serious.
3rd repost
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
Answer:
0.917 L
Explanation:
Step 1: Given data
Molar concentration of the solution (M): 0.530 M (0.530 mol/L)Mass of Ca(OH)₂ (solute): 36.0 gStep 2: Calculate the moles corresponding to 36.0 g of Ca(OH)₂
The molar mass of Ca(OH)₂ is 74.09 g/mol.
36.0 g × 1 mol/74.09 g = 0.486 mol
Step 3: Calculate the volume of the solution
Molarity is equal to the moles of solute divided by the liters of solution.
M = moles of solute / liters of solution
liters of solution = moles of solute / M
liters of solution = 0.486 mol / (0.530 mol/L) = 0.917 L
Answer:
0.917 liters
Hope this helps! :D
Explanation:
5.
(08.02 MC)
A 0.530 M Ca(OH)2 solution was prepared by dissolving 36.0 grams of Ca(OH)2 in enough water. What is the total volume of the solution thus formed? (4 points)
Which of the following chemical reactions will produce a precipitate?
3 KBr + AlPO4 → K3PO4 + AlBr3
Na2CO3 + CaCl2 → CaCO3 + 2 NaCl
NH4OH + KCl → KOH + NH4Cl
ZnCl2 + Mg2SO4 → ZnSO4 + MgCl2
Answer:
Na2CO3 + CaCl2 → CaCO3 + 2 NaCl
Explanation:
A double displacement reaction is a type of metathesis reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions usually involve reacting two soluble salts in aqueous solution resulting in the formation of two products: a soluble salt and an insoluble salt that is produced as a precipitate.
If the reaction of two soluble compounds does not produce a precipitate, the reaction does not result in the formation of a product as basically, all the ions are mixed together in the reaction vessel.
From the given reactions above:
1. 3 KBr + AlPO4 → K3PO4 + AlBr3
The reaction does not proceed to product formation as the two products are all soluble salts.
2. Na2CO3 + CaCl2 → CaCO3 + 2 NaCl
The reaction occurs as one of the products, CaCO3 is insoluble as is produced as a precipitate.
3. NH4OH + KCl → KOH + NH4Cl
The reaction does nott occuras the products are all soluble in water.
4. ZnCl2 + Mg2SO4 → ZnSO4 + MgCl2
The reaction does not occur as the products are all soluble in water.
What is the maximum number of electrons that can be identified with each of following sets of quantum numbers? If there are none, enter 0.
5. The following are energy releasing phase changes EXCEPT
A. Condensation B. Freezing C. Deposition D. Sublimation
Answer: All are energy releasing phase changes EXCEPT sublimation.
Explanation:
When molecules with high energy start to lose their energy and begin to settle down then heat energy is released in this process. Hence, this change is exothermic in nature.
When molecules with low energy absorb heat and start moving randomly from one place to another then molecules move to high energy level. Hence, this change is endothermic in nature.
Condensation - The conversion of gas phase into liquid phase is called condensation. Energy is released in this process.
Freezing - The conversion of liquid phase into solid phase is called freezing. Energy is released in this process.
Deposition - The conversion of gas phase into solid phase is called deposition. Energy is released in this process.
Sublimation - The conversion of a solid phase into gas phase without undergoing liquid phase is called sublimation. Energy is absorbed in this process.
Thus, we can conclude that out of the given options all are energy releasing phase changes EXCEPT sublimation.
The aforementioned options are energy releasing phase changes except: D. Sublimation.
What is a phase change?A phase change can be defined as the change in the state (phase) of matter of a given chemical compound or substance such as:
Gas to solidSolid to liquidLiquid to gasLiquid to solidIn Science, a change in the state (phase) of matter that results in the release of energy is known as an exothermic reaction such as:
CondensationFreezingDepositionIn conclusion, sublimation is not an energy releasing phase change because it is an endothermic reaction.
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How many protons, neutrons, and electrons does potassium-38 have?
Answer:
19 protons, 20 neutrons and 18 electrons.
Explanation:
How many moles of NaCl are contained in 50.0 mL of 2.50 M NaCl?
Answer: 0.144 moles. :)
Explanation:
The number of moles of NaCl that are contained in 50.0 mL of 2.50 M NaCl is 0.125 moles
Using this formula
Molarity=Moles of solute/Liters of solution
First step is to convert 50.0 mL to Liters
Litres=50.0 ml×1 L/1000 ml
Litres=0.05 L
Now let determie the number of moles of NaCl
2.50M=moles/0.05
moles=2.50M(0.05)
moles = 0.125 moles of NaCl
Inconclusion The number of moles of NaCl that are contained in 50.0 mL of 2.50 M NaCl is 0.125 moles
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Aqueous sodium bromide reacts with chlorine gas to form aqueous sodium chloride and liquid bromine .
Write a balanced chemical equation for this reaction.
Answer:
2 NaBr(aq) + Cl₂(g) ⇒ 2 NaCl(aq) + Br₂(l)
Explanation:
Let's consider the unbalanced equation that occurs when aqueous sodium bromide reacts with chlorine gas to form aqueous sodium chloride and liquid bromine. This is a single displacement reaction.
NaBr(aq) + Cl₂(g) ⇒ NaCl(aq) + Br₂(l)
We will start balancing Cl atoms by multiplying NaCl by 2.
NaBr(aq) + Cl₂(g) ⇒ 2 NaCl(aq) + Br₂(l)
Then, we get the balanced equation by multiplying NaBr by 2.
2 NaBr(aq) + Cl₂(g) ⇒ 2 NaCl(aq) + Br₂(l)
After you compute the
of titrant
NaOH, you will copy that value into the row of the
data table for the
of analyte HCI.
Answer:
The first one is moles and so is the second one.
Explanation:
Answer:
1) Moles
2) Moles
Explanation:
On Edge
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Please answer ALL THREE if u can, thank you so so so so much!!!
Answer:
Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Explanation:
17.4. A gas is found to have a density of 8.00 g/L. Find the volume of the gas in a balloon that
has a mass of 24 grams.
A. 192 liters
B. 3 liters
C. 0.3 liters
D. 32 liters
what is the answer?
Answer:
3 litersExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
We have
[tex]volume = \frac{24}{8} = 3 \\ [/tex]
We have the final answer as
3 litresHope this helps you
A mixture of NO2 and N2O4 gas is at equilibrium in a closed container. These gases react with the equation 2NO2 ⇌ N2O4. What will happen if the size of the container is increased?
Answer:
Equilibrium will shift leftwards towards NO2.
Explanation:
Hello there!
In this case, according to the Le Cha telier's principle, it is possible to realize that the increase of the volume turns out in the shift towards the most of the gaseous moles are in; in such a way, for the given chemical reaction, we can notice how NO2 (reactant side) has the most of the moles (2 moles in comparison to 1 mole of N2O4); and therefore, by increasing the volume, the equilibrium will shift to it, it means leftwards.
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In the following SO3 is the Lewis ____ reaction.
SO3(g) + 02-(aq) → 02-(aq) → SO42-(aq)
Answer: acid
Explanation:
Answer:
A) Acid
Explanation:
I got the same question and answered correctly
[80 POINTS] Which reaction will most likely take place based on the activity series?
Answer:
Li + ZnCO3
Explanation:
Li is higher than Zn on the activity series so Ln is more easily oxidized and prefers to be in a compound. For the rest of the reactions, the element that is higher on the activity series is already in the compound, so the reactions wouldn't happen.
Answer:
C. Li + ZnCO3
Explanation:
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A correct statement of Henry's law is: a. The concentration of a gas in solution is inversely proportional to temperature. b. The concentration of a gas in solution is directly proportional to the mole fraction of solvent. c. The concentration of a gas in solution is independent of pressure. d. The concentration of a gas in a solution is inversely proportional to pressure. e. None of these.
Answer:
e. None of these.
Explanation:
Hey there!
In this case, since the Henry's law is defined in terms of pressure, henry's constant and pressure, as shown below:
[tex]C=K_H*P[/tex]
Whereas C is the concentration, KH the Henry's constant and P the pressure, we infer that the concentration of a gas solution is directly proportional to the pressure, which is not the group choices, therefore, the answer is e. None of these.
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d. What do all of the molecules in the table have in common?
Answer:
They all have a certain amount of protons electrons and neutrons.
Joan performed a shadow puppet play for her younger brother by shining a flashlight on paper cutouts behind a curtain. What happens to the light from the flashlight?
Answer:
The light is transmitted through the curtain.
Explanation:
I believe this might be the answer, please comment if it’s incorrect
Consider the following scenario
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations
What is the main selective pressure in this scenario?
Oleg length
Odrought
Ofish population
Oinsect population
Answer: b
Explanation: jk
Which of these actions is an example of erosion caused by gravity?
A.
Constant freezing and thawing water forming a hole in an asphalt road
B.
Pieces of rock breaking off and falling from a mountain top
C.
Chemicals in the air dissolve minerals in a marble statue
D.
Plant roots widening cracks in a large granite rock
Answer:
The answer is a
Explanation:because yes
Answer: The answer is B.
Explanation: The rocks falling off is caused by gravity. Other options don't include effects of gravity; Therefore, B is correct.
KFell Fe"(CN), + e + Nat → KNaFe'Fe(CN)6
Fe'l. [Fe(CN)6]z + 4e + 4Na+ Na Fe",[Fe''(CN)613
2NH3 + 60H
N2 + 6H2O + 6e
->
What are the reactants in this reaction? What are the products?
Answer:
Most common oxidation states: +2, +3
M.P. 1535º
B.P. 2750º
Density 7.87 g/cm3
Characteristics: Iron is a gray, moderately active metal.
Characteristic reactions of Fe²⁺ and Fe³⁺
The [Fe(H2O)6]3+ ion is colorless (or pale pink), but many solutions containing this ion are yellow or amber-colored because of hydrolysis. Iron in both oxidation states forms many complex ions.
Aqueous Ammonia
Aqueous ammonia reacts with Fe(II) ions to produce white gelatinous Fe(OH)2, which oxidizes to form red-brown Fe(OH)3:
Fe2+(aq)+2NH3(aq)+3H2O(l)↽−−⇀Fe(OH)2(s)+2NH+4(aq)(1)
Fe3appt.gif
Aqueous ammonia reacts with Fe(III) ions to produce red-brown Fe(OH)3:
Fe3+(aq)+3NH3(aq)+3H2O(l)↽−−⇀Fe(OH)3(s)+3NH+4(aq)(2)
Fe3bppt.gif
Both precipitates are insoluble in excess aqueous ammonia. Iron(II) hydroxide quickly oxidizes to Fe(OH)3 in the presence of air or other oxidizing agents.
Sodium Hydroxide
Sodium hydroxide also produces Fe(OH)2 and Fe(OH)3 from the corresponding oxidation states of iron in aqueous solution.
Fe2+(aq)+2OH−(aq)↽−−⇀Fe(OH)2(s)(3)
Fe4appt.gif
Fe3+(aq)+3OH−(aq)↽−−⇀Fe(OH)3(s)(4)
Fe4bppt.gif
Neither hydroxide precipitate dissolves in excess sodium hydroxide.
Potassium Ferrocyanide
Potassium ferrocyanide will react with Fe3+ solution to produce a dark blue precipitate called Prussian blue:
K+(aq)+Fe3+(aq)+[Fe(CN)6]4−(aq)↽−−⇀KFe[Fe(CN)6](s)(5)
Fe5a1ppt.gif
With Fe2+ solution, a white precipitate will be formed that will be converted to blue due to the oxidation by oxygen in air:
2Fe2+(aq)+[Fe(CN)6]4−(aq)↽−−⇀Fe2[Fe(CN)6](s)(6)
Fe5a2ppt.gif
Many metal ions form ferrocyanide precipitates, so potassium ferrocyanide is not a good reagent for separating metal ions. It is used more commonly as a confirmatory test.
Potassium Ferricyanide
Potassium ferricyanide will give a brown coloration but no precipitate with Fe3+. With Fe2+, a dark blue precipitate is formed. Although this precipitate is known as Turnbull's blue, it is identical with Prussian blue (from Equation 5).
K+(aq)+Fe+2(aq)+[Fe(CN)6]3−(aq)↽−−⇀KFe[Fe(CN)6](s)(7)
Fe5b.gif
Potassium Thiocyanate
KSCN will give a deep red coloration to solutions containing Fe3+:
Fe+3(aq)+NCS−(aq)↽−−⇀[FeNCS]+2(aq)(8)
Fe5cppt.gif
No Reaction
Cl−, SO2−4
4. The following occurs when heat energy is removed: Gas --A-> Liquid-B--> Solid.
What would be the phase change for A and B respectively?
A. Condensation, freezing
C. Condensation, melting
B. Melting, evaporation
D. Sublimation, deposition
Answer: The phase change for A and B respectively is condensation, freezing.
Explanation:
A process in which gaseous state of a substance converts into liquid state is called condensation.
For example, conversion of steam into water.
A process in which liquid state of a substance converts into solid state is called freezing.
For example, conversion of liquid water into ice.
Thus, we can conclude that the phase change for A and B respectively is condensation and freezing.
Condensation and freezing would be the phase change for A and B respectively.
What is Freezing?This is the process in which a liquid becomes solid and is mostly caused by exposure to cool temperatures.
Gaseous substances also have the ability to become liquids through the process known as Condensation. This therefore makes option A the most appropriate choice.
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PLEASE HELP WILL MARK BRAINLEST!!!
Answer:
C. i don't kow
Explanation:
Question 6 (1 point)
"When two or more objects collide, there will be the same amount of momentum before the collision as after" is
a) Momentum Rule
b) Law of Collisions
c) Law of Conservation of Momentum
d) The Law of Before and After
S- 2500m
112
VODO
4. Two waves are traveling in the same medium with a speed of 340 m/s. What is the difference in
frequency of the waves if the one has a wavelength of 5.0 m and the other has a wavelength of
0.2 m?
Answer:
1632 Hz
Explanation:
We'll begin by calculating the frequency of each wave. This can be obtained as follow:
1st wave:
Velocity (v) = 340 m/s.
Wavelength 1 (λ₁) = 5 m
Frequency 1 (f₁) =?
v = λ₁f₁
340 = 5 × f₁
Divide both side by 5
f₁ = 340 / 5
f₁ = 68 Hz
2nd wave:
Velocity (v) = 340 m/s.
Wavelength 2 (λ₂) = 0.2 m
Frequency 2 (f₂) =?
v = λ₂f₂
340 = 0.2 × f₂
Divide both side by 0.2
f₂ = 340 / 0.2
f₂ = 1700 Hz
Finally, we shall determine the difference in the frequency of both waves.
This can be obtained as follow:
Frequency 1 (f₁) = 68 Hz
Frequency 2 (f₂) = 1700 Hz
Difference =?
Difference = f₂ – f₁
Difference = 1700 – 68
Difference = 1632 Hz
What is the reducing agent in the following reaction?
2 Br−(aq) + H2O2(aq) + 2 H+(aq) → Br2(aq) + 2 H2O(l)
Answer:
the reducing agent is Bromine
The oxidation state of an element is calculated by subtracting and the total sum of oxidation states of all the individual atom (excluding the one that has to be calculated) from total charge on the molecule. Bromine is the reducing agent in the following reaction.
What is oxidation state?Oxidation state of an element is a number that is assigned to an element in a molecule that represents the number of electron gained or lost during the formation of that molecule or compound.
The ionic equation is given as
2 Br⁻(aq) + H[tex]_2[/tex]O[tex]_2[/tex](aq) + 2 H⁺(aq) → Br[tex]_2[/tex](aq) + 2 H[tex]_2[/tex]O(l)
The oxidation state of bromine on reactant side is -1 while on product side it is 0 so, oxidation state of bromine has increased by 1 so, bromine is oxidized. If it is oxidized that means it must have reduced someone. So, bromine is acting as a reducing agent.
Therefore, bromine is the reducing agent in the given reaction.
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Which of the below is not a characteristic of a liquid?
Has a definite volume
Particles are spread far apart
Particles move at a medium speed
Takes the shape of its container
