As written in book: Define a system and it\'ssurroundings and give the direction

Question

As written in book:

Define a system and it'ssurroundings and give the direction of heat transfer for thefollowing:

1) Propane is burning in a Bunsen burner in the laboratory.
2) After you have a swim, water droplets on your skinevaporate.
3) Water, originally at 25°C, is places in the freezingcompartment of a refrigerator.
4) Two chemicals are mixed in a flask on a laboratory bench. Areaction occurs and heat is evolved. As written in book:

Define a system and it'ssurroundings and give the direction of heat transfer for thefollowing:

1) Propane is burning in a Bunsen burner in the laboratory.
2) After you have a swim, water droplets on your skinevaporate.
3) Water, originally at 25°C, is places in the freezingcompartment of a refrigerator.
4) Two chemicals are mixed in a flask on a laboratory bench. Areaction occurs and heat is evolved.

Explanation / Answer

1. system = propane, heat transfer out of system 2. system = water droplets, heat transfer into system 3. system = water, heat transfer out of system 4. system= the two chemicals, heat out of system

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