7.2 Heat energy changes in Chemical Reactions

Question 1

Is salt dissolving in water endothermic, exothermic or both?

Answer 1

Both

Question 2

Is a Neutralisation reaction endothermic, exothermic or both?

Answer 2

Exothermic

Question 3

Is a displacement reaction endothermic, exothermic or both?

Answer 3

Both

Question 4

What kind of reaction is a precipitation reaction?

Answer 4

Exothermic

Question 5

Describe an exothermic reaction

Answer 5

.A reaction where energy is transferred to the surroundings so the temperature of the surroundings increases

Question 6

Give an example of an exothermic reaction

Answer 6

.Combustion
.Oxidation reactions
.Neutralisation reactions

Question 7

Give an example of an everyday exothermic reaction

Answer 7

.Self Heating Cans

.Hand Warmers

Question 8

Describe an Endothermic reaction

Answer 8

.A reaction that takes energy in from the surroundings so the temperature of the surroundings decreases

Question 9

Give an example of an endothermic reaction

Answer 9

.The reaction of Citric Acid and Sodium Hydrocarbonate

. Thermal Decomposition

Question 10

What type of reaction are sports injury packs based on?

Answer 10

Endothermic reactions

Question 11

Is the breaking of bonds endothermic or exothermic?

Answer 11

Endothermic as energy must be supplied

Question 12

Is the making of bonds endothermic or exothermic?

Answer 12

Exothermic

Question 13

What is meant by the term activation energy?

Answer 13

The minimum amount of energy required that particles must have to react