Chemistry multiple choice questions

Question 1  (.8 points)

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Find the false statements about oxides, as investigated in the
laboratory:

i) MgO dissolved in an acid, proving it is a basic oxide.

ii) Lithium hydroxide was formed when metallic lithium reacted with
water.

iii) Yellow sulfur burned in oxygen, producing a basic oxide.

iv) Dissolving copper oxide in sulfuric acid produced hydrogen gas.

v) Since phosphorus is a nonmetal, it forms an acidic oxide.

e. i, ii, v  

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Question 2  (.8 points)

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In a thermochemistry experiment the reaction of 0.0857 g of an unknown
metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the
volume of an ice/water mixture. Calculate the enthalpy of this reaction
per 1 g of metal reacted. Needed data:

density of water at 273 K = 1.00 g/ml

density of ice at this temperature = 0.917 g/mL

ice enthalpy of fusion = 333 J/g

e. +0.723 kJ  

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Question 3  (.9 points)

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Arrange the following pure substances in order of increasing molar
entropy at 298 K:

(1) acetone, (2) carbon monoxide, (3) methanol, (4) sodium acetate.

e. 2 < 4 < 3 < 1  

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Question 4  (.9 points)

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When the equilibrium constant constant K at 25oC for

CO(g) + H2O(g) = H2(g) + CO2(g)

is calculated using data from Appendix B of Silberberg, the value
obtained is

e. ) 3.4 x 1059  

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Question 5  (.8 points)

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A certain amount of heat, 5.21 kJ, is released during the reversible
freezing of one mole of a substance at a constant temperature of -8.72
oC. Calculate the entropy change of the substance associated with the
freezing process (in J/mole/K, with three significant figures). Do not
enter the units. Think about the sign!

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Question 6  (.9 points)

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Which of the following processes is (are) spontaneous at P = 1atm?

e. Ba2+(aq) + SO42-(aq)  BaSO4(s) + H2O at 25oC.  

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Question 7  (.8 points)

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Calculate Sfor the combustion of propane.

C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)

Substance C3H8(g) O2(g) CO2(g) H2O(g)



S(J/Kmol) 269.9 205.138 213.74 188.825



e. 877.5 J/K  

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Question 8  (.8 points)

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G for the reaction of ammonia with fluorine.

2NH3(g) + 5F2(g)  N2F4(g) + 6HF(g)

Substance NH3(g) F2(g) N2F4(g) HF(g)



G f (kJ/mol) -16.4 0 79.9 -275.4



e. none of the above  

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Question 9  (.8 points)

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When the following redox equation is balanced with the smallest whole
number coefficients, what is the coefficient for chlorine gas?

KmnO4 + KCl + H2SO4 = MnSO4 + K2SO4 + H2O + Cl2

e. ) 10  

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Question 10  (.8 points)

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Consider the following reaction:

2Bi(OH)3(s) + 3Sn(OH)3-(aq) + 3OH-(aq) = 2 Bi(s) + 3 Sn(OH)62-(aq).

Identify the matching pairs below.





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Question 11  (.8 points)

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Which is most easily reduced - under standard conditions?

d. ) Mn  

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Question 12  (.9 points)

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Consider the electrochemical cell:

Cr | Cr(NO3)3(aq)|| NiSO4(aq) | Ni.

Identify the false statement(s):

e. The concentration of Cr3+(aq) decreases as the reaction proceeds.

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Question 1  (.8 points)

Top of Form

Find the false statements about oxides, as investigated in the
laboratory:

i) MgO dissolved in an acid, proving it is a basic oxide.

ii) Lithium hydroxide was formed when metallic lithium reacted with
water.

iii) Yellow sulfur burned in oxygen, producing a basic oxide.

iv) Dissolving copper oxide in sulfuric acid produced hydrogen gas.

v) Since phosphorus is a nonmetal, it forms an acidic oxide.

e. i, ii, v  

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Question 2  (.8 points)

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In a thermochemistry experiment the reaction of 0.0857 g of an unknown
metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the
volume of an ice/water mixture. Calculate the enthalpy of this reaction
per 1 g of metal reacted. Needed data:

density of water at 273 K = 1.00 g/ml

density of ice at this temperature = 0.917 g/mL

ice enthalpy of fusion = 333 J/g

e. +0.723 kJ  

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Question 3  (.9 points)

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Arrange the following pure substances in order of increasing molar
entropy at 298 K:

(1) acetone, (2) carbon monoxide, (3) methanol, (4) sodium acetate.

e. 2 < 4 < 3 < 1  

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Question 4  (.9 points)

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When the equilibrium constant constant K at 25oC for

CO(g) + H2O(g) = H2(g) + CO2(g)

is calculated using data from Appendix B of Silberberg, the value
obtained is

e. ) 3.4 x 1059  

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Question 5  (.8 points)

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A certain amount of heat, 5.21 kJ, is released during the reversible
freezing of one mole of a substance at a constant temperature of -8.72
oC. Calculate the entropy change of the substance associated with the
freezing process (in J/mole/K, with three significant figures). Do not
enter the units. Think about the sign!

Answer:Bottom of Form

Question 6  (.9 points)

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Which of the following processes is (are) spontaneous at P = 1atm?

e. Ba2+(aq) + SO42-(aq)  BaSO4(s) + H2O at 25oC.  

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Question 7  (.8 points)

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Calculate Sfor the combustion of propane.

C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g)

Substance C3H8(g) O2(g) CO2(g) H2O(g)



S(J/Kmol) 269.9 205.138 213.74 188.825



e. 877.5 J/K  

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Question 8  (.8 points)

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G for the reaction of ammonia with fluorine.

2NH3(g) + 5F2(g)  N2F4(g) + 6HF(g)

Substance NH3(g) F2(g) N2F4(g) HF(g)



G f (kJ/mol) -16.4 0 79.9 -275.4



e. none of the above  

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Question 9  (.8 points)

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When the following redox equation is balanced with the smallest whole
number coefficients, what is the coefficient for chlorine gas?

KmnO4 + KCl + H2SO4 = MnSO4 + K2SO4 + H2O + Cl2

e. ) 10  

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Question 10  (.8 points)

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Consider the following reaction:

2Bi(OH)3(s) + 3Sn(OH)3-(aq) + 3OH-(aq) = 2 Bi(s) + 3 Sn(OH)62-(aq).

Identify the matching pairs below.





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Question 11  (.8 points)

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Which is most easily reduced - under standard conditions?

d. ) Mn  

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Question 12  (.9 points)

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Consider the electrochemical cell:

Cr | Cr(NO3)3(aq)|| NiSO4(aq) | Ni.

Identify the false statement(s):

e. The concentration of Cr3+(aq) decreases as the reaction proceeds.

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