Question

1. catalysts (3.2) define catalyst and explain how enzymes catalyze reactions. include a graph to explain activation energy.

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the reaction. Enzymes are biological catalysts. They catalyze reactions by binding to specific substrates at their active - sites, forming an enzyme - substrate complex. This lowers the activation energy of the reaction. Activation energy is the minimum amount of energy that reactant molecules must have to start a chemical reaction. A graph of activation energy would have the energy on the y - axis and the progress of the reaction on the x - axis. The uncatalyzed reaction would have a higher activation energy peak compared to the catalyzed reaction.

Answer:

A catalyst is a substance that speeds up a chemical reaction without being used up. Enzymes catalyze reactions by binding to substrates at active - sites and lowering activation energy. A graph of activation energy shows a higher peak for an uncatalyzed reaction compared to a catalyzed one.