Question

what triggers a chemical reaction? - kareem jarrah
ted ed
the hole represents the product,
or result of the reaction.
multiple-choice question
when the hill goes up, energy must
be ________, when the hill goes down,
energy is ________.
□ released, added
□ added, released
□ released, released
□ added, added
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Explanation:

In chemical reactions (and using the golf - ball - on - a - hill analogy), to get over an energy "hill" (activation energy barrier), energy must be added (like a golf ball needing energy to go up a hill). When the reaction proceeds down the energy "hill" (forming products), energy is released (similar to a golf ball releasing energy as it rolls down a hill). So when the hill goes up, energy must be added, and when the hill goes down, energy is released.

Answer:

B. added, released