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depends upon what the catalyst is used on such as H2SO4 is used generally for substitution reactions which require sulfuric acid to convert and supplement hydrogen into the reaction for the product to take place.

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14y ago
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12y ago

Enzymes are catalysts:

Substances that retain their original chemical composition while bringing about a change in a substrate.

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12y ago

manganese dioxide can make a good catalyst.

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Q: What elements make good catalysts?
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