CHEMISTRY STRAIGHTERLINE EXAM 2025 LATEST UPDATED 400
ACTUAL EXAM QUESTIONS WITH 100% RATED CORRECT ANSWERS
100% VERIFIED GET A+
An endothermic reaction causes the surroundings to:
A. warm up
B. become acidic
C. condense
D. decrease in temperature
E. release CO2 - (Correct Answer)D
An exothermic reaction causes the surroundings to:
心的坚强决定了我们的命运。当
A. warm up
我们面对挫折时，是一颗不屈的
B. become acidic
心让我们勇敢前行
C. expand
D. decrease its temperature
E. release CO2 - (Correct Answer)A
Copper metal has a specific heat of 0.385 J/g•oC and has a melting point of 1083oC.
calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0oC to
875oC.
A. 1.97 10 ─ 5 J
B. 1.0 10 ─ 2 J
C. 329 J
D. 7.51 kJ
E. 10.5 kJ - (Correct Answer)D
,Calculate the amount of heat necessary to raise the temperature of 12.0 kg of water from 15.4oC
to 93.0oC.
A. 0.027 kJ B. 324 kJ C. 389 kJ D. 931 kJ
E. 3890 kJ - (Correct Answer)E
How much heat is required to raise the temperature of 1500 g of water from 25oC
to 52oC?
A. 1500 kJ B. 169 kJ C. 6.27 kJ D. 40.5 J E. 40.5 kJ - (Correct Answer)B
How many degrees of temperature rise will occur when a 25.0 g block of aluminum absorbs 10
kJ of heat? The specific heat of Al is 0.900 J/g•oC.
A. 0.44oC B. 22.5oC C. 225oC D. 360oC E. 444oC - (Correct Answer)E
心的坚强决定了我们的命运。当
If 325 g of water at 4.2oC absorbs 12.28 kJ, then what is the final temperature of the water?
我们面对挫折时，是一颗不屈的
A. 4.21oC B. 4.8oC C. 9.0oC D. 13.2oC E. 2938oC - (Correct Answer)D
心让我们勇敢前行
A glass containing 200 g of H2O at 20oC was placed into a refrigerator. The water loses 11.7 kJ
as it cools to a constant temperature. What is its new temperature?
A. 0.013oC B. 4oC C. 6oC D. 14oC E. 34oC - (Correct Answer)C
A piece of copper with a mass of 218 g has a heat capacity of 83.9 J/oC. What is the specific heat
of copper?
A. 0.385 J/g•oC B. 1.83 ´ 104 J/g•oC C. 2.60 J/g•oC D. 1.32 J/g•oC
E. 24.5 J/g•oC - (Correct Answer)A
The specific heat of gold is 0.129 J/g•oC. What is the molar heat capacity of gold (unit is
J/mol•oC)?
A. 0.039 J/mol•oC
B. 0.129 J/mol•oC
,C. 25.4 J/mol•oC
D. 39.0 kJ/mol•oC
E. 197 J/mol•oC - (Correct Answer)C
When 0.7521 g of benzoic acid was burned in a calorimeter containing 1000 g of water, a
temperature rise of 3.60oC was observed. What is the heat capacity of the bomb calorimeter,
excluding water? The heat of combustion of benzoic acid is ─26.42 kJ/g.
A. 15.87 kJ/oC
B. 4.18 kJ/oC
C. 5.52 kJ/oC
D. 1.34 kJ/oC
E. 752.1 kJ/oC - (Correct Answer)D
心的坚强决定了我们的命运。当
Naphthalene combustion can be used to determine the heat capacity of a bomb calorimeter. The
heat of combustion of naphthalene我们面对挫折时，是一颗不屈的
is 40.1 kJ/g. When 0.8210 g of naphthalene was combusted in
a calorimeter containing 1000 g of心让我们勇敢前行
water a temperature rise of 4.21oC was observed. What is the
heat capacity of the bomb calorimeter excluding the water?
A. 32.9 kJ/oC
B. 7.8 kJ/oC
C. 1.76 kJ/oC
D. 1.76 kJ/oC
E. 15.3 kJ/oC - (Correct Answer)C
Which of the following processes is endothermic?
a. O2(g) + 2H2(g) 2H2O(g)
b. H2O(g) H2O(l)
c. 3O2(g) + 2CH3OH(g) 2CO2(g) + 2H2O(g)
d. H2O(s) H2O(l) - (Correct Answer)D
, A 100 mL sample of 0.200 M aqueous hydrochloric acid is added to 100 mL of 0.200 M aqueous
ammonia in a calorimeter whose heat capacity is 480 J K ─ 1. The following reaction occurs
when the two solutions are mixed.
HCl(aq) + NH3(aq) NH4Cl(aq)
The temperature increase is 2.34oC. Calculate ΔH per mole of HCl neutralized.
A. 154 kJ B. 44.5 kJ C. 22.5 kJ D. ─22.5 kJ E. ─56.2 kJ - (Correct Answer)E
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The Htotal heat
capacity of the calorimeter plus water was 5760 J/oC. If the temperature rise of the calorimeter
with water was 0.570oC, calculate the enthalpy of combustion of magnesium.
Mg(s) + 1/2O2(g) MgO(s)
A. ─3280 kJ/mol B. ─24.8 kJ/mol C. 435 kJ/mol
D. 106 kJ/mol E. ─602 kJ/mol - (Correct Answer)E
心的坚强决定了我们的命运。当
Which one of the following reactions occurring at 25oC does the symbol ΔHof[H2SO4(l)] refer
我们面对挫折时，是一颗不屈的
to?
心让我们勇敢前行
A. 2H(g) + S(g) + 4O(g) H2SO4(l)
B. H2(g) + S(g) + 2O2(g) H2SO4(l)
C. H2SO4(l) H2(g) + S(s) + 2O2(g)
D. H2SO4(l) 2H(g) + S(s) + 4O(g)
E. H2(g) + S(s) + 2O2(g) H2SO4(l) - (Correct Answer)E
Which one of the following reactions occurring at 25oC does the symbol ΔHof[HNO3(l)] refer
to?
A. H(g) + N(g) + O3(g) HNO3(l)
B. 1/2H2(g) + 1/2N2(g) + 3/2O2(g) HNO3(l)
C. HNO3(l) 1/2H2(g) + 1/2N2(g) + 3/2O2(g)
D. HNO3(l) H(g) + N(g) + 3O(g)
E. H2(g) + N2(g) + O3(g) HNO3(l) - (Correct Answer)B
ACTUAL EXAM QUESTIONS WITH 100% RATED CORRECT ANSWERS
100% VERIFIED GET A+
An endothermic reaction causes the surroundings to:
A. warm up
B. become acidic
C. condense
D. decrease in temperature
E. release CO2 - (Correct Answer)D
An exothermic reaction causes the surroundings to:
心的坚强决定了我们的命运。当
A. warm up
我们面对挫折时，是一颗不屈的
B. become acidic
心让我们勇敢前行
C. expand
D. decrease its temperature
E. release CO2 - (Correct Answer)A
Copper metal has a specific heat of 0.385 J/g•oC and has a melting point of 1083oC.
calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0oC to
875oC.
A. 1.97 10 ─ 5 J
B. 1.0 10 ─ 2 J
C. 329 J
D. 7.51 kJ
E. 10.5 kJ - (Correct Answer)D
,Calculate the amount of heat necessary to raise the temperature of 12.0 kg of water from 15.4oC
to 93.0oC.
A. 0.027 kJ B. 324 kJ C. 389 kJ D. 931 kJ
E. 3890 kJ - (Correct Answer)E
How much heat is required to raise the temperature of 1500 g of water from 25oC
to 52oC?
A. 1500 kJ B. 169 kJ C. 6.27 kJ D. 40.5 J E. 40.5 kJ - (Correct Answer)B
How many degrees of temperature rise will occur when a 25.0 g block of aluminum absorbs 10
kJ of heat? The specific heat of Al is 0.900 J/g•oC.
A. 0.44oC B. 22.5oC C. 225oC D. 360oC E. 444oC - (Correct Answer)E
心的坚强决定了我们的命运。当
If 325 g of water at 4.2oC absorbs 12.28 kJ, then what is the final temperature of the water?
我们面对挫折时，是一颗不屈的
A. 4.21oC B. 4.8oC C. 9.0oC D. 13.2oC E. 2938oC - (Correct Answer)D
心让我们勇敢前行
A glass containing 200 g of H2O at 20oC was placed into a refrigerator. The water loses 11.7 kJ
as it cools to a constant temperature. What is its new temperature?
A. 0.013oC B. 4oC C. 6oC D. 14oC E. 34oC - (Correct Answer)C
A piece of copper with a mass of 218 g has a heat capacity of 83.9 J/oC. What is the specific heat
of copper?
A. 0.385 J/g•oC B. 1.83 ´ 104 J/g•oC C. 2.60 J/g•oC D. 1.32 J/g•oC
E. 24.5 J/g•oC - (Correct Answer)A
The specific heat of gold is 0.129 J/g•oC. What is the molar heat capacity of gold (unit is
J/mol•oC)?
A. 0.039 J/mol•oC
B. 0.129 J/mol•oC
,C. 25.4 J/mol•oC
D. 39.0 kJ/mol•oC
E. 197 J/mol•oC - (Correct Answer)C
When 0.7521 g of benzoic acid was burned in a calorimeter containing 1000 g of water, a
temperature rise of 3.60oC was observed. What is the heat capacity of the bomb calorimeter,
excluding water? The heat of combustion of benzoic acid is ─26.42 kJ/g.
A. 15.87 kJ/oC
B. 4.18 kJ/oC
C. 5.52 kJ/oC
D. 1.34 kJ/oC
E. 752.1 kJ/oC - (Correct Answer)D
心的坚强决定了我们的命运。当
Naphthalene combustion can be used to determine the heat capacity of a bomb calorimeter. The
heat of combustion of naphthalene我们面对挫折时，是一颗不屈的
is 40.1 kJ/g. When 0.8210 g of naphthalene was combusted in
a calorimeter containing 1000 g of心让我们勇敢前行
water a temperature rise of 4.21oC was observed. What is the
heat capacity of the bomb calorimeter excluding the water?
A. 32.9 kJ/oC
B. 7.8 kJ/oC
C. 1.76 kJ/oC
D. 1.76 kJ/oC
E. 15.3 kJ/oC - (Correct Answer)C
Which of the following processes is endothermic?
a. O2(g) + 2H2(g) 2H2O(g)
b. H2O(g) H2O(l)
c. 3O2(g) + 2CH3OH(g) 2CO2(g) + 2H2O(g)
d. H2O(s) H2O(l) - (Correct Answer)D
, A 100 mL sample of 0.200 M aqueous hydrochloric acid is added to 100 mL of 0.200 M aqueous
ammonia in a calorimeter whose heat capacity is 480 J K ─ 1. The following reaction occurs
when the two solutions are mixed.
HCl(aq) + NH3(aq) NH4Cl(aq)
The temperature increase is 2.34oC. Calculate ΔH per mole of HCl neutralized.
A. 154 kJ B. 44.5 kJ C. 22.5 kJ D. ─22.5 kJ E. ─56.2 kJ - (Correct Answer)E
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The Htotal heat
capacity of the calorimeter plus water was 5760 J/oC. If the temperature rise of the calorimeter
with water was 0.570oC, calculate the enthalpy of combustion of magnesium.
Mg(s) + 1/2O2(g) MgO(s)
A. ─3280 kJ/mol B. ─24.8 kJ/mol C. 435 kJ/mol
D. 106 kJ/mol E. ─602 kJ/mol - (Correct Answer)E
心的坚强决定了我们的命运。当
Which one of the following reactions occurring at 25oC does the symbol ΔHof[H2SO4(l)] refer
我们面对挫折时，是一颗不屈的
to?
心让我们勇敢前行
A. 2H(g) + S(g) + 4O(g) H2SO4(l)
B. H2(g) + S(g) + 2O2(g) H2SO4(l)
C. H2SO4(l) H2(g) + S(s) + 2O2(g)
D. H2SO4(l) 2H(g) + S(s) + 4O(g)
E. H2(g) + S(s) + 2O2(g) H2SO4(l) - (Correct Answer)E
Which one of the following reactions occurring at 25oC does the symbol ΔHof[HNO3(l)] refer
to?
A. H(g) + N(g) + O3(g) HNO3(l)
B. 1/2H2(g) + 1/2N2(g) + 3/2O2(g) HNO3(l)
C. HNO3(l) 1/2H2(g) + 1/2N2(g) + 3/2O2(g)
D. HNO3(l) H(g) + N(g) + 3O(g)
E. H2(g) + N2(g) + O3(g) HNO3(l) - (Correct Answer)B
