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. Topic 9 – Kinetics and Equilibrium
5. Energy and chemical reaction: Relating energy to change in temperature of reactions
1. What type of a chemical reaction will cause an increase in the temperature of the surrounding in
which the reaction is taking place?
1) Exothermic, because heat will be released
2) Exothermic because heat will be absorbed
3) Endothermic because heat will be released
4) Endothermic because heat will be absorbed
2. When an endothermic reaction occurs in a solution, the temperature of the solution
1) Increases because heat energy is given off by the reaction
2) Increases because heat energy is absorbed by the reaction
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Teacher Preview Copy
3) Decreases because heat energy is given off by the reaction
4) Decreases because heat energy is absorbed by the reaction
3. When an exothermic process occurs in water, the temperature of the water will
1) Increase because heat energy is given off by the reaction
2) Increase because heat energy is absorbed by the reaction
3) Decrease because heat energy is given off by the reaction
4) Decrease because heat energy is absorbed by the reaction
4. When a substance is dissolved in water, the temperature of the water increases. This process is best
described as
1) Endothermic, with a release of energy
2) Endothermic, with an absorption of energy
3) Exothermic, with a release of energy
4) Exothermic with an absorption of energy
5. Salt A and salt B were each dissolved in separate beakers of water at 21 C. The temperature of salt A
o
solution decreased, and the temperature of salt B solution increased.
Based on these results, which conclusion is correct?
1) The water gained energy from both salt A and salt B
2) The water lost energy to both salt A and salt B
3) The water gained energy from salt A and lost energy to salt B
4) The water lost energy to salt A and gained energy from salt B
6. Solid X and solid Y were dissolved in separate 100 ml beakers of water. The water temperatures
were recorded as shown in the table below.
Salt X Salt Y
o
o
Initial water temperature 40.3 C 40.3 C
o
o
Final water temperature 34.5 C 46.1 C
Which statement is the best conclusion from the above information?
1) The dissolving of only Salt X was exothermic
2) The dissolving of only Salt Y was endothermic
3) The dissolving of both Salt X and Salt Y was exothermic
4) The dissolving of Salt X was endothermic and the dissolving of Salt Y was exothermic
270 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
5. Energy and chemical reaction: Relating energy to change in temperature of reactions
1. What type of a chemical reaction will cause an increase in the temperature of the surrounding in
which the reaction is taking place?
1) Exothermic, because heat will be released
2) Exothermic because heat will be absorbed
3) Endothermic because heat will be released
4) Endothermic because heat will be absorbed
2. When an endothermic reaction occurs in a solution, the temperature of the solution
1) Increases because heat energy is given off by the reaction
2) Increases because heat energy is absorbed by the reaction
Teacher Preview Copy
Teacher Preview Copy
3) Decreases because heat energy is given off by the reaction
4) Decreases because heat energy is absorbed by the reaction
3. When an exothermic process occurs in water, the temperature of the water will
1) Increase because heat energy is given off by the reaction
2) Increase because heat energy is absorbed by the reaction
3) Decrease because heat energy is given off by the reaction
4) Decrease because heat energy is absorbed by the reaction
4. When a substance is dissolved in water, the temperature of the water increases. This process is best
described as
1) Endothermic, with a release of energy
2) Endothermic, with an absorption of energy
3) Exothermic, with a release of energy
4) Exothermic with an absorption of energy
5. Salt A and salt B were each dissolved in separate beakers of water at 21 C. The temperature of salt A
o
solution decreased, and the temperature of salt B solution increased.
Based on these results, which conclusion is correct?
1) The water gained energy from both salt A and salt B
2) The water lost energy to both salt A and salt B
3) The water gained energy from salt A and lost energy to salt B
4) The water lost energy to salt A and gained energy from salt B
6. Solid X and solid Y were dissolved in separate 100 ml beakers of water. The water temperatures
were recorded as shown in the table below.
Salt X Salt Y
o
o
Initial water temperature 40.3 C 40.3 C
o
o
Final water temperature 34.5 C 46.1 C
Which statement is the best conclusion from the above information?
1) The dissolving of only Salt X was exothermic
2) The dissolving of only Salt Y was endothermic
3) The dissolving of both Salt X and Salt Y was exothermic
4) The dissolving of Salt X was endothermic and the dissolving of Salt Y was exothermic
270 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
