Rate Of Chemcial Reaction

Question 1

Activation Energy

Answer 1

The minimum energy required to start a chemical reaction.

Or

The energy required to form the activated complex.

Question 2

Activated complex

Answer 2

A high energy, unstable temporary transition state between the reactants and the products

Question 3

A catalyst

Answer 3

A substance that increases the rate of chemical reaction but remains unchanged at the end of the reaction

Question 4

The reaction rate of a chemical reaction

Answer 4

The change in concentration per unit time of either a reactant or product

Question 5

Heat of reaction (Delta H)

Answer 5

The net change in chemical potential energy of the system. Delta H > 0 for endothermic reactions and Delta H < 0 for exothermic reactions

Question 6

Exothermic reactions

Answer 6

Reactions which transform chemical potential energy into thermal energy

Question 7

Endothermic reactions

Answer 7

Reactions which transform thermal energy into chemical potential energy