Test 2 Review Questions

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1. In a chemical reaction, a catalyst provides an alternate reaction pathway that *

A) increases the concentration of the reactants

B) has a higher activation energy

C) has a lower activation energy

D) decreases the concentration of the products

2. What occurs when a catalyst is added to a chemical reaction? *

A) an alternate reaction pathway with a higher activation energy

B) the same reaction pathway with a higher activation energy

C) an alternate reaction pathway with a lower activation energy

D) the same reaction pathway with a lower activation energy

3. Which one of the following expressions represents the heat of reaction for a chemical change in terms of potential energy, PE? *

4. Given the reaction at 101.3 kilopascals and 298 K below. This reaction is classified as *

A) endothermic, because heat is released

B) endothermic, because heat is absorbed

C) exothermic, because heat is released

D) exothermic, because heat is absorbed

5. Which one of the following statements describes characteristics of an endothermic reaction? *

A) The sign of ΔH is negative, and the products have less potential energy than the reactants.

B) The sign of ΔH is positive, and the products have more potential energy than the reactants.

C) The sign of ΔH is negative, and the products have more potential energy than the reactants.

D) The sign of ΔH is positive, and the products have less potential energy than the reactants

6. According to the table I , what is the total amount of energy released in the formation of one mole of H2O(g)? *

A) 571.6 kJ

B) 285.8 kJ

C) 55.8 kJ

D) 241.8 kJ

7. Based on the table I, how many kilojoules of heat are given off when 0.500 mole of Al2O3 (s) is formed from its elements? *

A) 1,676 kJ

B) 3,351 kJ

C) 13,404 kJ

D) 838 kJ

8. As the temperature rises above 0°C, which phase change occurs? *

A) H2O(s) → H2O(ℓ), endothermic

B) H2O(s) → H2O(ℓ), exothermic

C) H2O(ℓ) → H2O(s), exothermic

D) H2O(ℓ) → H2O(s), endothermic

9. When NH4NO3 is dissolved in water, the temperature of the water decreases. When NaOH is dissolved in a separate water sample, the temperature of the water increases. Based on these observations, it can be concluded that the dissolving of

A) NH4NO3 is exothermic and the dissolving of NaOH is endothermic

B) both salts are endothermic

C) NH4NO3 is endothermic and the dissolving of NaOH is exothermic

D) both salts are exothermic

Clear selection

10. Given the potential energy diagram representing a reversible reaction, the activation energy for the reverse reaction is represented by *

A) C + D

B) A + B

C) B + D

D) B + C

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