Unit 5

Question 1

What is an exothermic energy transfer?

Answer 1

transfer to the surroundings

Question 2

What is an endothermic energy transfer?

Answer 2

transfer from the surroundings

Question 3

What is a reaction profile?

Answer 3

diagram showing how the energy changes in a reaction

Question 4

What is the activation energy?

Answer 4

minimum amount of energy required before a collision will result in a reaction

Question 5

What is bond energy?

Answer 5

the energy required to break a bond or the energy released when a bond is formed

Question 6

In terms of bond breaking and making, what is an exothermic reaction?

Answer 6

less energy is required to break the bonds than is released when making the bonds

Question 7

In terms of bond breaking and making, what is an endothermic reaction?

Answer 7

more energy is required to break the bonds than is released when making the bonds

Question 8

How are chemical cells made?

Answer 8

connect two different metals (electrodes) in a solution (electrolyte)