Which one of the following is NOT a factor that affects the speed of reactions?

For ______ reactions to take place the reactants must hit one another with enough energy

When liquid or gas reactants are crowded close together we say they are ______.

Concentrated reactants produce _____ reactions.

When reactants move _____, they hit with more force, which speeds up the reaction.

When _____ reactants are crowded close together only those on the surface can come in contact with the other reactants.

A _______ is a chemical that speeds up a reaction but is not part of the reaction.

If the reactants are spaced far apart, we say they are _____ (the opposite of concentrated).

Reactions with dilute reactants are _____.

Which of these does NOT speed up a chemical reaction?

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