Chemistry - January 2011

41 The temperature of a sample of water changes from 10C to 20C when the sample absorbs 418 joules of heat. What is the mass of the sample?

(1) 1 g      (3) 100 g
(2) 10 g    (4) 1000 g

42 Given the reaction at 101.3 kilopascals and 298 K:


(1) endothermic, because heat is absorbed
(2) endothermic, because heat is released
(3) exothermic, because heat is absorbed
(4) exothermic, because heat is released

43 Given the equation:

44 The graph below represents the uniform heating of a sample of a substance starting as a solid below its melting point.

Which statement describes what happens to the energy of the particles of the sample during time interval DE?

(1) Average kinetic energy increases, and potential energy remains the same.
(2) Average kinetic energy decreases, and potential energy remains the same.
(3) Average kinetic energy remains the same, and potential energy increases.
(4) Average kinetic energy remains the same, and potential energy decreases.

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