Adding a catalyst to a reaction will: I. increase the amount...

Adding a catalyst to a reaction will: I. increase the amount of product produced II. make the reaction occur faster by III. lowering the energy of the products relative to the reactants IV. lowering the activation energy V. providing an alternate pathway for the reaction to occur I, III, and IV I, III, and V I, IV, and V II, III, and IV II, III, and V II, IV, and V

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00:02 Hi there.

00:03 This question is about catalysts.

00:09 And catalysts speed up chemical reactions.

00:14 So there are substances that can be added or that are present that speed up chemical reactions without themselves being part of the reaction.

00:28 So therefore they are unchanged in the reaction.

00:31 Because they don't act as a reactant, they don't act as a product.

00:35 They just help speed up the chemical reaction without being a reactant or a product, without reactant.

00:41 In themselves.

00:47 Therefore, many catalysts can be used over and over and over again.

00:52 Living things use catalysts, and catalysts in living things, are called enzymes.

00:58 And they're very important because they speed up biological reactions that otherwise would be too slow to keep the organism alive.

01:06 So enzymes are very important, as many of them serve as catalysts in biological reactions.

01:12 All right, but let's talk about how catalyst speed up these reactions.

01:17 Well, what they're going to do is lower that amount of energy required to start the reaction.

01:23 So they're going to lower the activation energy.

01:31 And they can do this by giving an alternate pathway for the reaction, one that requires less energy.

01:50 Okay, so this is a summary of a catalyst...

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