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

a) exothermic
b) 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

Explanation:

Exothermic reactions release energy and can occur spontaneously. Endothermic reactions absorb energy and may not occur spontaneously. Melting of ice requires heat (absorbs energy), so it's endothermic. A reaction that releases energy and doesn't need initial energy to occur is exothermic, and a reaction that absorbs energy and requires energy to occur is endothermic.

Answer:

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