Question

Question asking about how enzymes affect the rate of a reaction. Check all that apply

1. They shift the reaction equilibrium towards the products.

2. They increase the concentration of the reactants.

3. They lower the activation energy of the reaction.

4. They decrease the free energy of a reaction.

5. They promote the formation of a transition state.

I have selected, so far, 2 3 and 5. I know they decrease free energy of activation so I wasn't sure on 4. I also thought 1 was true but then I didn't think it could change Keq for the reaction.

Answer 1

1. I don't think enzymes shift anything. Catalysts don't change Keq.

2. They do not increase the concn of the reactants. This may cause some guessing if they increased concn of PRODUCTS but surely they don't have an impact on reactants.

3. They do this.

4. Isn't decreasing free energy the same thing as changing Keq? Can it do that?

5. I think they do this as a way of lowering the activation energy.

Answer 2

5. Is an odd ball question. From my knowledge, enzymes stabilize the transition state, but they do not form it.

Answer 3

But they do promote the formation of a transition state.

Answer 4

The post answer is "They promote the formation .... and I think this is right. Promoting it and stabilizing it fits in the same ball park I think. The post didn't say it "formed" it; just "promoted" it. To me that means it must be there to make it work but how it works isn't specified.

Answer 5

i thought formed at first, but after rereading it I saw that your initial response was correct: enzymes do promote formation of the transition state.

Answer 6

I do not know please reply anyone

Answer 7

They promote the formation of a transition state
And
They lower the activation energy of the reactants