Question

Consider each of the three processes below to be the system. For which of the following would the sign of q for the system be negative1. burning of wood 2. an exothermic reaction 3. melting of iceGroup of answer choicesall three1 and 21 and 32 and 3

Answer 1

Look at the next drawing please:

The three situations will be analyzed according to the drawing above:

1. Burning of wood is an exothermic reaction, therefore, it frees heat to the surroundings. => q (-)

2. An exothermic reaction releases heat, therefore is equal to 1. => q (-)

3. Melting of ice consumes heat. => endothermic => q (+)

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Answer: 1 and 2