Chemical Reactions

Question 1

Do chemical reactions just go one way?

Answer 1

No, they are constantly going in both ways, though the flow can be greater in one direction depending on the conditions.

Question 2

Weaker Bonds vs. Stronger Bonds

Answer 2

Weaker bonds are less stable, and therefore contain more free energy. Stronger bonds are more stable, and therefore have lower potential energy.

Question 3

Exergonic Reaction

Answer 3

Release of energy that can do work in the cell. Cell respiration. Catabolism. ATP-> ADP

Question 4

Endergonic Reaction

Answer 4

Requires input of energy to proceed. Active transport. Cell movements. Anabolism. ADP->ATP

Question 5

ATP in this context.

Answer 5

Very unstable bond between last phosphate group and ADP. Therefore there is a lot of energy but it is not super stable.

Question 6

Coupled Reactions

Answer 6

reactions where energy from an exergonic reaction goes into an endergonic reaction.

Question 7

How do you overcome Activation Energy?

Answer 7

By heat or by enzymes. Enzymes make the reaction happen faster.

Question 8

How do enzymes work to lower Activation Energy?

Answer 8

1. Bring reactants into close proximity 2. Bind to reactant to cause physical strain 3. transfer charge, changing shape or reactivity