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Chemical reactions that absorb energy A. often occur spontaneously. B. will not occur without a source of energy. C. always require catalysts. D. are often explosive.
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Chemical reactions that absorb energy

A. often occur spontaneously.
B. will not occur without a source of energy.
C. always require catalysts.
D. are often explosive.

User Olshansky
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4 votes
It is b because you need to have energy
User Floby
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