1. Answers
(2) D, E (13) C (3) A (14) A (4) A (15) B (5) B (16) D (6) C (17) A (7) A (18) B (8) B (19) B (9) D (20) A (10) A (21) D (11) C (22) C (12) B

2. The burning of magnesium involves the conversion of
iRespond Question F
Multiple Choice
A.) heat energy to light energy
B.) light energy to heat energy
C.) light energy to chemical energy
D.) chemical energy to light energy
E.) chemical energy to heat energy

3. F
Multiple Choice
iRespond Question
A student observed that the temperature of water increased when a salt was dissolved in it. The student should conclude that dissolving the salt caused
A.) an exothermic reaction
C.)
B.) an endothermic reaction
D.)
E.)

4. NaOH(s) + H2O(l)  NaOH(aq) + heat
What change occurs when pellets of NaOH are added to water and stirred?
NaOH(s) + H2O(l)  NaOH(aq) + heat
iRespond Question F
Multiple Choice
A.) The water temperature increases as chemical energy is converted to heat energy.
B.) The water temperature increases as heat energy is stored as chemical energy.
C.) The water temperature decreases as chemical energy is converted to heat energy.
D.) The water temperature decreases as heat energy is stored as chemical energy.
E.)

5. The average kinetic energy of water molecules is greatest in which of these samples?
iRespond Question F
Multiple Choice
A.) 10 g of water at 35°C
B.) 10 g of water at 55°C
C.) 100 g of water at 25°C
D.) 100 g of water at 45°C
E.)

6. F
Multiple Choice
iRespond Question
Which change in the temperature of a 1-gram sample of water would cause the greatest increase in the average kinetic energy of its molecules?
A.) 1oC to 10oC
B.) 10oC to 1oC
C.) 50oC to 60oC
D.) 60oC to 50oC
E.)

7. Two samples of gold that have different temperatures are placed in contact with one another. Heat will flow spontaneously from a sample of gold at 60oC to a sample of gold that has a temperature of
iRespond Question F
Multiple Choice
A.) 50oC
B.) 60oC
C.) 70oC
D.) 80oC
E.)

8. Solid X is placed in contact with solid Y
Solid X is placed in contact with solid Y. Heat will flow spontaneously from X to Y when
iRespond Question F
Multiple Choice
A.) X is 20oC and Y is 20oC
B.) X is 10oC and Y is 5oC
C.) X is -25oC and Y is -10oC
D.) X is 25oC and Y is 30oC
E.)

9. Several cubes of ice are added to a warm drink to make the drink cold
Several cubes of ice are added to a warm drink to make the drink cold. This is because
iRespond Question F
Multiple Choice
A.) ice is a good conductor of heat.
B.) ice is a poor conductor of heat.
C.) ice releases coldness when it melts.
D.) ice absorbs heat when it melts.
E.)

10. gone and the temperature of the drink is
Several cubes of ice are added to a warm drink. After a few minutes the ice is almost
gone and the temperature of the drink is
iRespond Question F
Multiple Choice
A.) lower than before the ice was added to it.
B.) higher than before the ice was added to it.
C.) the same as that of the ice.
D.) impossible to tell.
E.)

11. Which Kelvin temperature is equal to -73°C?
iRespond Question F
Multiple Choice
A.) 100 K
B.) 173 K
C.) 200 K
D.) 346 K
E.)

12. Which Celcius temperature is equivalent to 300 K?
iRespond Question F
Multiple Choice
A.) 0 ºC
B.) 27 ºC
C.) 300 ºC
D.) 573 ºC
E.)

13. C.) Both received the same amount of heat energy
100 mL of water at 25°C and 100 mL of alcohol at 25°C are both heated at the same rate under identical conditions. After 3 minutes the temperature of the alcohol is 50°C. Two minutes later the temperature of the water is 50°C. Which liquid received more heat as it warmed to 50°C?
iRespond Question F
Multiple Choice
A.) The water
B.) The alcohol
C.) Both received the same amount of heat energy
D.) It is impossible to tell from the information given
E.)

14. The specific heat of silver is 0. 24 J/gºC
The specific heat of silver is 0.24 J/gºC. How much heat is needed to warm 4.37 g of silver from 25.0ºC to 27.5ºC?
iRespond Question F
Multiple Choice
A.) 2.62 J
B.) 0.14 J
C.) 45.5 J
D.) J
E.)

15. What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312 g sample by 15ºC
iRespond Question F
Multiple Choice
A.) cal/gºC
B.) 0.33 cal/gºC
C.) 0.99 cal/gºC
D.) 1.33 cal/gºC
E.)

16. Which information about a chemical reaction is provided by a potential energy diagram?
iRespond Question F
Multiple Choice
A.) the oxidation states of the reactants and products
B.) the average kinetic energy of the reactants and products
C.) the change in solubility of the reacting substances
D.) the energy released or absorbed during the reaction
E.)

17. In a potential energy diagram, the difference between the potential energy of the products and the potential energy of the reactants is equal to the
iRespond Question F
Multiple Choice
A.) heat of reaction
B.) entropy of the reaction
C.) activation energy of the forward reaction
D.) activation energy of the reverse reaction
E.)

18. Which arrow represents the potential energy of the reactants?
Given the potential energy diagram of a chemical reaction: (see image)
Which arrow represents the potential energy of the reactants?
iRespond Question F
Multiple Choice
A.)
B.)
C.)
D.)
E.)

19. Which statement correctly describes an endothermic chemical reaction?
iRespond Question F
Multiple Choice
A.) The products have a higher potential energy than the reactants and ΔH is negative
B.) The products have a higher potential energy than the reactants and ΔH is positive
C.) The products have a lower potential energy than the reactants and ΔH is negative
D.) The products have a lower potential energy than the reactants and ΔH is positive
E.)

20. Which statement is true about energy in this reaction?
CH4 + 2 O2  2 H2O + CO2 + heat
Which statement is true about energy in this reaction?
iRespond Question F
Multiple Choice
A.) The reaction is exothermic because it releases heat.
B.) The reaction is exothermic because it absorbs heat.
C.) The reaction is endothermic because it releases heat.
D.) The reaction is endothermic because it absorbs heat.
E.)

21. Calculate the energy required to produce 7 moles of Cl2O7
2Cl2 + 7 O kJ  2 Cl2O7
Calculate the energy required to produce 7 moles of Cl2O7
iRespond Question F
Multiple Choice
A.) kJ
B.) kJ
C.) kJ
D.) kJ
E.)

22. Na2O + 2 HI  2 NaI + H2O ΔH = -120.00 kcalF
Multiple Choice
iRespond Question
Na2O + 2 HI  2 NaI + H2O
ΔH = kcal
Calculate the energy released when 24.8 g Na2O reacts in the equation above.
A.) kcal
B.) 2.42 kcal
C.) 48.0 kcal
D.) 300 kcal
E.)