Question

which statement best explains how enzymes speed up a chemical reaction? enzymes are not changing as a result of a chemical reaction enzymes remove heat from a chemical reaction enzymes lower the activation energy of a chemical reaction question 2 enzymes are sensitive to changes in their surroundings such as temperature and ph. true false question 3 how do enzymes lower the activation energy? they bring molecules together making it easier for reactions to occur they increase the temperature of a reaction

Explanation:

• For Question 1: Enzymes are biological catalysts that speed - up reactions by lowering the activation energy, the minimum energy required for a reaction to occur. The fact that they are not changed in the reaction (while true) does not explain how they speed up reactions. Removing heat does not speed up reactions and is not what enzymes do.
• For Question 2: Enzymes have an optimal temperature and pH range. Deviations from these optimal conditions can denature the enzyme, altering its structure and function, so they are sensitive to temperature and pH changes.
• For Question 3: Enzymes lower activation energy by bringing substrates (reactant molecules) together in the correct orientation and proximity, facilitating the reaction. They do not increase the temperature of a reaction.

Answer:

Question 1: Enzymes lower the activation energy of a chemical reaction
Question 2: True
Question 3: They bring molecules together making it easier for reactions to occur