A(n) ________________ makes the formation of a certain amount of product take longer.

____________ help your body convert food to fuel, build bone and muscle tissue, and convert extra energy to fat.

A chemical reaction begins with substances called ______________ and ends with substances called ___________.

Most chemical reactions ______________ when temperature increases.

Most chemical reactions _____________ when concentration increases.

The fire in a fireplace is an example of an exothermic reaction. Explain what happens in an exothermic reaction.

_____________ slows down most chemical reactions.

The _________________ is the speed at which products form or reactants disappear.

_____________ is(are) needed to break bonds in chemical reactions.

Catalysts are always ______________.

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