Given samples of water:Sample 1: 100. grams of water at 10.°C Sample 2: 100. grams of water at 20.°

January 2018 NY Regents Chemistry Exam

40 Given samples of water:

Sample 1: 100. grams of water at 10.°C Sample 2: 100. grams of water at 20.°C

Compared to sample 1, sample 2 contains
(1) molecules with a lower average kinetic energy

(2) molecules with a lower average velocity
(3) less heat energy
(4) more heat energy

Solution: Temperature is the measure of the average kinetic energy. Since the temperature of sample 2 is higher than sample 1, it would have a higher average kinetic energy, eliminating choice 1. It would, however, have more heat energy (thermal energy)

Answer:4

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