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4. For a reaction to occur, energy must be_ __ to break chemical bonds.
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4. For a reaction to occur, energy must be_
__ to break chemical bonds.

User Mohammad Fallah
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Answer:

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Step-by-step explanation:

You have to put energy into a molecule to break its chemical bonds. The amount needed is called the bond energy. After all, molecules don't spontaneously break.

User DaszuOne
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