Question

1. reactions that can not occur spontaneously are ..

oa) exothermic
ob) endothermic
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not graded

1. melting of the ice - cube is an example of ...

oa) exothermic
ob) endothermic
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not graded

1. what type of reaction releases energy and does not require initial energy to occur?

oa) exothermic
ob) endothermic
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1. what type of chemical reaction absorbs energy and requires energy for the reaction to occur?

a) exothermic
b) endothermic
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solutions

Explanation:

Exothermic reactions release energy and can occur spontaneously. Endothermic reactions absorb energy and often require an energy input to occur. Melting of an ice - cube requires heat energy input.

1. Non - spontaneous reactions often need energy input, which are endothermic.
2. Melting an ice cube requires heat absorption, so it is endothermic.
3. Reactions that release energy and occur spontaneously are exothermic.
4. Reactions that absorb energy and require energy input are endothermic.

Answer:

1. B. endothermic
2. B. endothermic
3. A. exothermic
4. B. endothermic