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A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. The fact that they aren't changed by participating in a reaction distinguishes catalysts from substrates, which are the reactants on which catalysts work. Enzymes catalyze biochemical reactions.
The one with higher mass has a higher density because it fits more mass into the same amount of space (volume).
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Sodium Hydroxide turns blue litmus red .