chpt 2 lesson 4.txt
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what happens to chemical bonds during chemical reactions?
during chemical reactions bonds break in the reactants and new bonds form in the product.
describe the role of energy in chemical reactions.
chemical reactions that release energy often occur spontaneosly and chemical reactions that absorb energy will occur only with a source of energy.
the energy needed to start a chemical reaction.
what are enzymes and how are they important to living things?
enzymes are proteins that act as biological catalysts. Enzymes speed up chemical reactions that take place in a cell.
How do enzymes work?
like other catalysts, enzymes act by lowering the activation energy.
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