CHEM 101 EXAM 2023

What is ΔS° for the following reaction?
SiCl4(g) + 2Mg(s) → 2MgCl2(s) + Si(s)
Substance SiCl4(g) Mg(s) MgCl2(s) Si(s)
S°(J/K • 330.73 32.68 89.62 18.83
mol)
Select one:

a. –254.96 J/K • mol

b. –198.02 J/K • mol



c. +198.02 J/K • mol

d. +254.96 J/K • mol

e. +471.86 J/K • mol

Question 2

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A spontaneous endothermic reaction always
Select one:

a. causes the surroundings to get colder.



b. bursts into flame.

c. requires a spark to initiate it.

d. releases heat to the surroundings.

, Question 3

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Ozone (O3) in the atmosphere can react with nitric oxide (NO) as follows.
O3(g) + NO(g) → NO2(g) + O2(g). ΔH°rxn = –199 kJ/mol, ΔS°rxn = –4.1 J/K • mol
What is ΔG°rxn for this reaction at 25°C?
Select one:

a. 1020 kJ/mol

b. –1.22 × 103 kJ/mol

c. 2.00 × 103 kJ/mol

d. –1.42 × 103 kJ/mol

e. –198 kJ/mol



Question 4

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When the following equation is balanced with the lowest whole number coefficients, the

coefficients are:

, Cu(s) + H+(aq) + NO3–(aq) → NO(g) + H2O(l) + Cu2+(aq)
Select one:

a. 1, 2, 1, 1, 1, 1

b. 3, 2, 1, 1, 1, 3

c. 3, 2, 4, 2, 4, 3

d. 1, 8, 2, 2, 4, 1

e. 3, 8, 2, 2, 4, 3



Question 5

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Based on the following electrochemical cell, which statement is true?




Half-
E° (V)
Reaction
Al3+(aq)
–1.66
+ 3e– → Al(s)
Cd2+(aq)
–0.40
+ 2e → Cd(s)
–


Select one: