Chapter 17

Question 1

What is an exothermic change?

Answer 1

A change in which heat is given out to the surroundings.

Question 2

What is an endothermic change?

Answer 2

A change in which heat is absorbed from the surroundings.

Question 3

What is enthalpy change?

Answer 3

The enthalpy change represents the difference in energy content of the reactants and products.

Question 4

What does overall enthalpy change equal to?

Answer 4

total energy absorbed for bond breaking - total energy released for bond making

Question 5

In an exothermic reaction, total energy absorbed for bond breaking is (…) than the total energy released for bond making.

Answer 5

less

Question 6

In an endothermic reaction, the total energy absorbed for bond breaking is (…) than the total energy released for bond making.

Answer 6

more

Question 7

What is activation energy?

Answer 7

The minimum amount of energy that reactant particles must possess in order for a chemical reaction to occur.