Review Questions
These questions test vocabulary and simple concepts.
For each of the following, define a system and its surroundings and give the direction of heat transfer:
(a) Propane is burning in a Bunsen burner in the laboratory.
(b) After you have a swim, water droplets on your skin evaporate.
(c) Water, originally at 25 °C, is placed in the freezing compartment of a refrigerator.
(d) Two chemicals are mixed in a flask on a laboratory bench. A reaction occurs and heat is evolved.
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