41 The temperature of a sample of water
changes from 10°C to 20°C 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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