AP Classroom Questions - only for use by fellow teachers with accredited access to AP Classroom. Please respect.
6.6 MC Questions
1. 2 H2S(g) + 3 O2(g) → 2 H2O(l) + 2 SO2(g) ΔH° = −1120 kJ/molrxn
Based on the reaction represented by the chemical equation shown above, what is
the amount of heat released when 4.00 mol of H2S(g) reacts with 9.00 mol of O2(g) ?
A − 560 kJ B − 1120 kJ O
C − 2240 kJ D − 3360 kJ
2. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
The chemical equation shown above represents the reaction between Mg(s) and
HCl(aq). When 12.15g of Mg(s) is added to 500.0mL of 4.0M HCl(aq), 95kJ of heat is
released.
The experiment is repeated with 24.30g of Mg(s) and 500.0mL of 4.0M HCl(aq).
Which of the following gives the correct value for the amount of heat released by
the reaction?
A 380 kJ O
B 190 kJ C 95 kJ D 48 kJ
3. HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq) ΔH° = −57.1 kJ/molrxn
The chemical equation above represents the reaction between HCl(aq) and NaOH(aq).
When equal volumes of 1.00 M HCl(aq) and 1.00 M NaOH(aq) are mixed, 57.1kJ of
heat is released. If the experiment is repeated with 2.00 M HCl(aq), how much heat
would be released?
A 28.6 kJ O
B 57.1 kJ C 85.7 kJ D 114 kJ
4. K(s) + ½ Cl2(g) → KCl(s) ΔH° = -437kJ/molrxn
The elements K and Cl react directly to form the compound KCl according to the
equation above.
How much heat is released or absorbed when 0.050 mol of Cl2(g) is formed from
KCl(s)?
A 87.4 kJ is released B 43.7 kJ is released
C O 43.7 kJ is absorbed D 87.4 kJ is absorbed
ISPS Chemistry Nov 2022 page 22 Thermochemistry Questions
, AP Classroom Questions - only for use by fellow teachers with accredited access to AP Classroom. Please respect.
5. HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
A student is trying to determine the heat of reaction for the acid-base neutralisation
reaction represented above. The student uses 0.50 M NaOH and 0.50 M HCl solutions.
Which of the following situations, by itself, would most likely result in the LEAST error in
the calculated value of the heat of reaction?
O
A The thermometer was incorrectly calibrated and read 0.5 Celsius degree too high
during the procedure.
B The volume of the acid solution added to the calorimeter was actually 1.0 mL less
than what was recorded.
C The calorimeter was poorly insulated, and some heat escaped to the atmosphere
during the procedure.
D The actual molarity of the base solution was 0.53 M but was recorded as 0.50 M.
E The final temperature of the mixture was taken before the contents of the
calorimeter had reached thermal equilibrium.
6. K(s) + ½ Cl2(g) → KCl(s) ΔH° = -437kJ/molrxn
The elements K and Cl react directly to form the compound KCl according to the
equation above.
Which of the values of ΔH° for a process in the table is (are) less than zero
(i.e., indicate(s) an exothermic process) ?
A z only B O y and z only
C x, y, and z only D w, x, y, and z
ISPS Chemistry Nov 2022 page 23 Thermochemistry Questions
6.6 MC Questions
1. 2 H2S(g) + 3 O2(g) → 2 H2O(l) + 2 SO2(g) ΔH° = −1120 kJ/molrxn
Based on the reaction represented by the chemical equation shown above, what is
the amount of heat released when 4.00 mol of H2S(g) reacts with 9.00 mol of O2(g) ?
A − 560 kJ B − 1120 kJ O
C − 2240 kJ D − 3360 kJ
2. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
The chemical equation shown above represents the reaction between Mg(s) and
HCl(aq). When 12.15g of Mg(s) is added to 500.0mL of 4.0M HCl(aq), 95kJ of heat is
released.
The experiment is repeated with 24.30g of Mg(s) and 500.0mL of 4.0M HCl(aq).
Which of the following gives the correct value for the amount of heat released by
the reaction?
A 380 kJ O
B 190 kJ C 95 kJ D 48 kJ
3. HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq) ΔH° = −57.1 kJ/molrxn
The chemical equation above represents the reaction between HCl(aq) and NaOH(aq).
When equal volumes of 1.00 M HCl(aq) and 1.00 M NaOH(aq) are mixed, 57.1kJ of
heat is released. If the experiment is repeated with 2.00 M HCl(aq), how much heat
would be released?
A 28.6 kJ O
B 57.1 kJ C 85.7 kJ D 114 kJ
4. K(s) + ½ Cl2(g) → KCl(s) ΔH° = -437kJ/molrxn
The elements K and Cl react directly to form the compound KCl according to the
equation above.
How much heat is released or absorbed when 0.050 mol of Cl2(g) is formed from
KCl(s)?
A 87.4 kJ is released B 43.7 kJ is released
C O 43.7 kJ is absorbed D 87.4 kJ is absorbed
ISPS Chemistry Nov 2022 page 22 Thermochemistry Questions
, AP Classroom Questions - only for use by fellow teachers with accredited access to AP Classroom. Please respect.
5. HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
A student is trying to determine the heat of reaction for the acid-base neutralisation
reaction represented above. The student uses 0.50 M NaOH and 0.50 M HCl solutions.
Which of the following situations, by itself, would most likely result in the LEAST error in
the calculated value of the heat of reaction?
O
A The thermometer was incorrectly calibrated and read 0.5 Celsius degree too high
during the procedure.
B The volume of the acid solution added to the calorimeter was actually 1.0 mL less
than what was recorded.
C The calorimeter was poorly insulated, and some heat escaped to the atmosphere
during the procedure.
D The actual molarity of the base solution was 0.53 M but was recorded as 0.50 M.
E The final temperature of the mixture was taken before the contents of the
calorimeter had reached thermal equilibrium.
6. K(s) + ½ Cl2(g) → KCl(s) ΔH° = -437kJ/molrxn
The elements K and Cl react directly to form the compound KCl according to the
equation above.
Which of the values of ΔH° for a process in the table is (are) less than zero
(i.e., indicate(s) an exothermic process) ?
A z only B O y and z only
C x, y, and z only D w, x, y, and z
ISPS Chemistry Nov 2022 page 23 Thermochemistry Questions
