Reaction 1:

CuO(s)→Cu(s)+12O2(g)ΔG°=155kJ/molrxn


A chemist wants to produce Cu(s) from a sample of pure CuO(s) according to reaction 1, represented by the equation above.


(a) Using the data in the following table, calculate the value of the standard entropy change, ΔS°, for the reaction.


Substance Absolute Entropy at298 K (JK−1mol−1)

Cu(s) 33

O2(g) 205

CuO(s) 43


(b) Given that ΔG° for reaction 1 is positive (155kJ/molrxn), what must be true about the sign of ΔH° for the reaction? Justify your answer.


The decomposition of CuO(s) into Cu(s) and O2(g) is not a thermodynamically favored reaction. However, to produce Cu(s) from CuO(s), the chemist decides to pass H2(g) gas over the CuO(s) as it is heated strongly, as represented below.


Reaction 2:

CuO(s)+H2(g)−----heat→ Cu(s)+H2O(g)


(c) Reaction 2 is what type of chemical reaction? Justify your answer.


A third chemical reaction is represented below.


Reaction 3:

H2(g)+12O2(g)→H2O(g)ΔG°=−229kJ/molrxn


(d) Show how a combination of reaction 1 and reaction 3 can be used to produce reaction 2.


(e) Determine the value of ΔG° for reaction 2.


The chemist takes the Cu(s) produced from reaction 2 and uses it to make an electrode in a galvanic cell, as shown in the following diagram.


The figure presents a diagram of a galvanic cell consisting of two solutions in beakers, two metal electrodes, a salt bridge, and a wire. The half-cell on the left shows a copper electrode partially submerged in a solution of 1.0 molar copper sulfate. The half-cell on the right shows a silver electrode partially submerged in a solution of 1.0 molar silver nitrate. A salt bridge connects the two solutions. A wire connects the copper electrode and the silver electrode, and an arrow indicates that the electron flow through the wire is from the copper to the silver.


(f) Using the reduction half-reactions in the table below, write a balanced net-ionic equation representing the overall reaction that takes place as the cell operates.


Half-Reaction E° (volts)

Cu2+(aq)+2e−→Cu(s) 0.337

Ag+(aq)+e−→Ag(s) 0.800


(g) Determine the value of E° for the cell.

(h) Determine the value of ΔG° for the cell reaction.

Answer:

You answered your own question

The solubility of a substance is the amount of the substance that can be dissolved in a given amount of solvent at a specified temperature. Hence, option A is correct.

Solubility of a substance can be defined as the fraction of concentration of the substance which can be dissolved in a particular amount of a solvent at a specified temperature.

Solubility of a substance depends on the bond type, temperature, pressure and presence of impurities if any. If the bond strength is greater, less will be the solubility because, greater energy is needed to weaken the bonds in the salt.

Similarly, for most of the salts, as the temperature increases, solubility increases, but some salt's solubility is independent of the temperature such as for NaCl. Therefore, the correct definition of solubility is option A.

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Answer:

1,2, and 3 are correct.

Explanation:

1 is true because cellular respiration begins in the cytoplasm of a cell. 2 is true because cellular respiration releases energy aerobically which uses glucose and oxygen or anaerobically which just uses glucose. Either way, energy is being released. 3 is true, I don't know how to explain why. Just keep the cellular respiration equation in mind, (C6H12O6 + 6O2 → 6CO2 + 6H2O + Chemical Energy (in ATP)), the chemical reactions are basically summed up into an equation. Hope that helped.

Answer:

6.0 mol LiNO₃

Explanation:

First we need to determine which reactant is the limiting reactant:

We calculate with how many Ca(NO₃)₂ moles would 3.0 moles of Li₃PO₄ react, using the stoichiometric coefficients of the reaction:

There are not as many Ca(NO₃)₂ moles, so Ca(NO₃)₂ is the limiting reactant.

Using the number of moles of the limiting reactant, we calculate how many moles of LiNO₃ would be formed:

Answer:

0.8M

Explanation:

CM=n/V

The molarity is an important method which is used to determine the concentration of a solution. The molarity of potassium nitrate is 0.796 M.

The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is generally expressed in mol / L. The equation used to calculate the molarity is given as:

Molarity = Number of moles of the solute / Volume of the solution in litres

The number of moles is the ratio of the given mass to the molar mass. Here the mass of potassium nitrate is 20.2 g and its molar mass is 101.10 g/mol. Then the number of moles is:

n = 20.2 g / 101.10 g/mol = 0.199 mol

1 L = 1000 mL

250.0 mL = 250.0 / 1000 = 0.25 L

Molarity = 0.199 / 0.25 = 0.796 M

Thus the molarity is 0.796 M.

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Answer:

it's 4-methyl pentane

B. 2-methylpentane is the correct answer

Hence Option B is correct and rest are incorrect

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2 KMnO4 (aq) + 5 H2O2 (aq) + 3 H2SO4 (aq) → 5 O2 (g) + 2 MnSO4 (aq) + K2SO4 (aq) + 8 H2O (l)

Answer:

Sulfuric acid (American spelling) or sulphuric acid (Commonwealth spelling), also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H2SO4. It is a colorless, odorless and viscous liquid that is miscible with water.

Calcium nitrate is produced by applying nitric acid to limestone and then adding ammonia. It is known as a double salt, since it is comprised of two nutrients common in fertilizers which are high in sodium. The processed result also looks crystallized like salt.

Sucrose is common sugar. It is a disaccharide, a molecule composed of two monosaccharides: glucose and fructose. Sucrose is produced naturally in plants, from which table sugar is refined. It has the molecular formula C₁₂H₂₂O₁₁.

Explanation:

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Answer:

C. Endothermic because breaking bonds require energy

Explanation:

The reaction as follows is given in this question:

Cl2(g) → 2Cl(g)

According to this equation, chlorine molecule (Cl2) is broken down into chlorine atoms (2Cl) by breaking the bonds that holds the two atoms in the molecule together. Breaking of chemical bonds require energy input to occur.

An endothermic reaction is a reaction in which energy is absorbed or used up rather than released. Based on this definition, the reaction involving the breaking of bonds in chlorine molecule is an ENDOTHERMIC REACTION because breaking bonds require energy.

Answer:

c. Weak acid

Explanation:

Thus the correct answer is option c. Weak acid.

A strong acid would ionize completely, while a base would give off hydroxide ions (OH⁻).

This is the answer: There have been changes in Earth's life forms over time.

Explanation:

Solubility product is defined as the product of the concentrations or solubilities of the ions each raised to the power their stoichiometric coefficients present in the solution. It is expressed as [tex]K_{sp}[/tex].

(a): CuBr

The chemical equation for the dissociation of CuBr into its ions follows:

[tex]CuBr\rightleftharpoons Cu^++Br^-[/tex]

The expression of [tex]K_{sp}[/tex] for CuBr follows:

[tex]K_{sp}=[Cu^+][Br^-][/tex]

(b): [tex]ZnC_2O_4[/tex]

The chemical equation for the dissociation of [tex]ZnC_2O_4[/tex] into its ions follows:

[tex]ZnC_2O_4\rightleftharpoons Zn^{2+}+C_2O_4^{2-}[/tex]

The expression of [tex]K_{sp}[/tex] for [tex]ZnC_2O_4[/tex] follows:

[tex]K_{sp}=[Zn^{2+}][C_2O_4^{2-}][/tex]

(c): [tex]Ag_2CrO_4[/tex]

The chemical equation for the dissociation of [tex]Ag_2CrO_4[/tex] into its ions follows:

[tex]Ag_2CrO_4\rightleftharpoons 2Ag^{+}+CrO_4^{2-}[/tex]

The expression of [tex]K_{sp}[/tex] for [tex]Ag_2CrO_4[/tex] follows:

[tex]K_{sp}=[Ag^{+}]^2[CrO_4^{2-}][/tex]

(d): [tex]ZnC_2O_4[/tex]

The chemical equation for the dissociation of [tex]Hg_2Cl_2[/tex] into its ions follows:

[tex]Hg_2Cl_2\rightleftharpoons 2Hg^{+}+2Cl^{-}[/tex]

The expression of [tex]K_{sp}[/tex] for [tex]Hg_2Cl_2[/tex] follows:

[tex]K_{sp}=[Hg^{+}]^2[Cl^{-}]^2[/tex]

(e): [tex]AlCl_3[/tex]

The chemical equation for the dissociation of [tex]AlCl_3[/tex] into its ions follows:

[tex]AlCl_3\rightleftharpoons Al^{3+}+3Cl^{-}[/tex]

The expression of [tex]K_{sp}[/tex] for [tex]AlCl_3[/tex] follows:

[tex]K_{sp}=[Al^{3+}][Cl^{-}]^3[/tex]

(f): [tex]ZnC_2O_4[/tex]

The chemical equation for the dissociation of [tex]Mn_3(PO_4)_2[/tex] into its ions follows:

[tex]Mn_3(PO_4)_2\rightleftharpoons 3Mn^{2+}+2PO_4^{3-}[/tex]

The expression of [tex]K_{sp}[/tex] for [tex]Mn_3(PO_4)_2[/tex] follows:

[tex]K_{sp}=[Mn^{2+}]^3[PO_4^{3-}]^2[/tex]

The amount of energy needed to freeze 12.5 grams of water into ice is equals to 14.295 kilo joules.

Energy required to freeze water will be calculated by using the following equation as:

Q = mcT, where

m = mass of water = 12.5g = 0.0125kg

c = specific heat of water = 4.187 kJ/kg.K

T = temperature to freeze = 0 degree C = 273.15 K

On putting values we get,

Q = (0.0125)(4.187)(273.15)

Q = 14.295 kJ

Hence required amount of energy is 14.295 kJ.

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Answer:

major will be propan-2-ol

minor will be propan-1-ol

Answer:

I hope you understand please follow me please

Answer:

B. The substances that are formed

Explanation:

a chemical reaction is a reaction that there's a formation of a new compound or substance.

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Answer:

The correct answer is -

1. Latitude

2. Altitude

3. Bodies of water

4. Wind system

5. Amount of rainfall

Explanation:

Lattitude is the angle from the earth's equator towards the north or south to the poles. This is one of the important factors that lead to different seasons and define the temperature of the area.

Altitude is the elevation from the sea that also helps in affecting the seasons as the higher the altitude cooler the temperature. Water bodies like the sea affect the wind and climate as they are not able to absorb heat faster in comparison to the land.

Wind also affects the seasons and climate of the area as a large amount of warm air cools, it gives off  lots of rain over the land. Precipitation or rainfall determines and influences the climate.

Answer:

D. 6.3 x 10-5 mol/L NaOH

Explanation:

Alizarin yellow is an indicator that is yellow when pH < 10.1. In the same way, thymol blue is blue when pH > 9

That means the pH of the solution is between 9 - 10.1

Any acid as HCl could have a pH of these.

The solution of 3.2x10⁻⁴M NaOH has a pH of:

pOH = -log[OH-] = 3.49

pH = 14-pOH = 10.51. The pH of the solution is not 10.5

Now, the solution of 6.3x10⁻⁵M NaOH has a pH:

pOH = -log[OH-] = 4.2

pH = 14-pOH = 9.8

The pH of the solution could be 9.8. Right option is:

Answer:

Cu

Explanation:

Copper since it is more reactive than Iron. Hence, it can easily displace ions in an iron based compound.

Answer:

0.25 mole of O₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

4Fe₃O₄ + O₂ —> 6Fe₂O₃

From the balanced equation above,

4 moles of Fe₃O₄ reacted with 1 mole of O₂.

Finally, we shall determine the number of mole of O₂ required to react with 1 mole of Fe₃O₄. This can be obtained as follow:

From the balanced equation above,

4 moles of Fe₃O₄ reacted with 1 mole of O₂.

Therefore, 1 mole of Fe₃O₄ will react with = (1/4) = 0.25 mole of O₂.

Thus, 0.25 mole of O₂ is required for the reaction.

Answer:  he basic components or 4'A' s of tourism are as follows:

ATTRACTION: It is the most important element & object that attract people to travel. ...

ACCESSIBILITY: It is important key factor for the development of tourism. ...

ACCOMMODATION: -It includes food & lodging facilities to the guest. ...

AMENITIES:

What are the components of tourism and hospitality?

Accommodations and.

Lodging.

Recreation and.

Entertainment.

Travel Services.

Food and Beverage Services.

Conventions and Event.

Management.

Explanation:

NOT MY WORDS! I HOPE ThIS HELPS!

Answer:

cis-1-Ethyl-2-propylcyclopropane <1-Cyclopropylpentane <cis-1,4-Dimethylcyclohexane <Ethylcyclohexane

Explanation:

The least is the number of additives especially at the position 1,4 of the cyclohexane, the more is the stability.

Hence, the correct order of increasing stability is

cis-1-Ethyl-2-propylcyclopropane <1-Cyclopropylpentane <cis-1,4-Dimethylcyclohexane <Ethylcyclohexane

Answer:

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Answer: The molar mass of the metal is 96.45 g/mol

Explanation:

The fluoride of the metal formed is [tex]MF_3[/tex]

The oxidation half-reaction follows:

[tex]M\rightarrow M^{3+}+3e^-[/tex]

Calculating the theoretical mass deposited by using Faraday's law, which is:

[tex]m=\frac{M\times I\times t(s)}{n\times F}[/tex]       ......(1)

where,

m = actual mass deposited = 1.25 g

M = molar mass of metal = ?

I = average current = 3.86 A

t = time period in seconds = 16.2 min = 972 s            (Conversion factor: 1 min = 60 sec)

n = number of electrons exchanged = [tex]3mol^{-1}[/tex]

F = Faraday's constant = 96500 C

Putting values in equation 1, we get:

[tex]1.25g=\frac{M\times 3.86A\times 972s}{3mol^{-1}\times 96500 C}\\\\M=\frac{1.25g\times 3mol^{-1}\times 96500 C}{3.86A\times 972s}\\\\M=96.45g/mol[/tex]

Hence, the molar mass of the metal is 96.45 g/mol

The molar mass of metal present in MF₃ is calculated by using faraday's law and is equal to 96.45 g/mole.

Molar mass of the metal will be calculated by using the Faraday's law as:

m = (M × I × t(s)) / n × F.

Chemical reaction for the given metal will be represented as:
M → M³⁺ + 3e⁻

And according to the Faraday's law given entities are:

m = given deposited mass = 1.25 g

I = average current = 3.86 A

t = time period in seconds = 16.2 min = 972 s

n = number of electrons exchanged = 3

F = Faraday's constant = 96500 C

M = molar mass of metal = to find?

Putting all these values in the above equation and calculate for M as:

M = (1.25)(3)(96500) / (3.86)(972) = 96.45 g/mole

Hence, the molar mass of metal is 96.45 g/mole.

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The question is incomplete, the complete question is:

A solution of permanganate is standardized by titration with oxalic acid. To react completely with 0.0018 mol of oxalic acid required 22.69 mL of permanganate solution. The unbalanced chemical equation for the reaction in acidic solution is:

[tex]MnO_4^-(aq)+H_2C_2O_4(aq)\stackrel{\mathrm{Acidic}}{\longrightarrow} Mn^{2+}(aq)+CO_2(g)[/tex]

Determine the concentration of the permanganate solution in molarity.

Answer: The molarity of permanganate solution is 0.0317 M

Explanation:

The balanced chemical equation follows:

[tex]2MnO_4^-(aq)+6H^+(aq)+5H_2C_2O_4(aq)\stackrel{\mathrm{Acidic}}{\longrightarrow} 2Mn^{2+}(aq)+8H_2O(l)+10CO_2(g)[/tex]

Given values:

Moles of oxalic acid = 0.0018 moles  

By the stoichiometry of the reaction:

If 5 moles of oxalic acid reacts with 2 moles of permanganate solution

So, 0.0018 moles of oxalic acid will react with = [tex]\frac{2}{5}\times 0.0018=0.00072mol[/tex] of permanganate solution

The formula used to calculate molarity:

[tex]\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{ \text{Volume of solution (mL)}}[/tex] .....(1)

Given values:

Moles of permanganate solution = 0.00072 moles

Volume of solution = 22.69 mL

Putting values in equation 1, we get:

[tex]\text{Molarity of permanganate solution}=\frac{0.00072\times 1000}{22.69}\\\\\text{Molarity of permanganate solution}=0.0317M[/tex]

Hence, the molarity of permanganate solution is 0.0317 M

The concentration of the permanganate solution in molarity is 0.0317 M

We'll begin by calculating the number of mole of permanganate needed to react with 0.0018 mole of oxalic acid.

2MnO₄¯(aq) + 5H₂C₂O₄(aq) + 6H⁺(aq) —> 2Mn²⁺(s) + 10CO₂(g) + 8H₂O(l)

From the balanced equation above,

5 moles of H₂C₂O₄ reacted with 2 moles of MnO₄¯

Therefore,

0.0018 mole of H₂C₂O₄ will react with = (0.0018 × 2) / 5 = 0.00072 mole of MnO₄¯

Mole of MnO₄¯ = 0.00072 mole

Volume = 22.69 mL = 22.69 / 0.02269 L

Molarity = mole / Volume

Molarity of MnO₄¯ = 0.00072 / 0.02269

Therefore, the molarity of the permanganate solution is 0.0317 M

Complete question:

A solution of permanganate is standardized by titration with oxalic acid. To react completely with 0.0018 mol of oxalic acid required 22.69 mL of permanganate solution. The unbalanced chemical equation for the reaction in acidic solution is:

MnO₄¯(aq) + H₂C₂O₄(aq) —> Mn²⁺(s) + CO₂(g)

Determine the concentration of the permanganate solution in molarity.

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Answer:

I will still answer your question!

Explanation:

There is no picture and no I will not steal your points, I will help you! :) Let me know when the picture is uploaded!

Answer:

n = 3.1 moles

Explanation:

Given that,

The volume of a balloon, V = 5.1 L

Pressure, P = 1.1 atm

Temperature, T = 22 K

We need to find the number of moles are required to fill the balloon. We know that,

Gas law, PV = nRT

Where

R is gas constant, R = 0.08206 L-atm/mol-K

So,

[tex]n=\dfrac{PV}{RT}\\\\n=\dfrac{1.1\times 5.1}{0.08206 \times 22}\\\\n=3.1[/tex]

So, there are 3.1 moles of helium are required.

The moles of helium are required to fill a 5.10 L ballon to a pressure of 1.1 atm at 22 Kelvin is 3.1 moles.

Moles of gases will be calculated by using the ideal gas equation as:

PV = nRT, where

P = pressure of gas = 1.1 atm

V = volume of gas = 5.10 L

R = universal gas constant = 0.08206 L-atm/mol-K

T = temperature of gas = 22K

n = moles of gas?

On putting all these values in the above equation and calculate for the value of n as:
n = 1.1 × 5.10 / 0.082 × 22 = 3.1 moles

Hence, the required moles is 3.1 moles.

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Answer:

A

Explanation:

Which technique would you choose for producing a polymer acrylonitrile.

A

Solution :

Given :

Amount of anserine solution = 0.200 M

pH value is = 7.20

Preparation of 0.04 M solution of anserine from the 0.2 M solution.

0.2 M x [tex]x[/tex] = 0.04 M x 1000 ml

[tex]x[/tex] = 200 ml

So the 200 ml of 0.2 M anserine solution is required to prepare0.04 M of anserine.

0.1 M x [tex]x[/tex] = 0.04 x 1000 ml

[tex]x[/tex] = 400 ml

Therefore, 400 ml of HCl is needed.