3.3 Calculating and explaining energy change

Question 1

What are exothermic reactions?

Answer 1

Reactions that transfer energy to the surroundings

Question 2

What are endothermic reactions?

Answer 2

Reactions that take in energy from the surroundings

Question 3

What happens during a chemical reaction?

Answer 3

Energy is transferred to or from the surroundings

Question 4

Combustion is an example of what type of reaction?

Answer 4

Exothermic

Question 5

Thermal decomposition is an example of what type of reaction?

Answer 5

An endothermic reaction

Question 6

In the laboratory, how can you tell if a reaction is exothermic?

Answer 6

There is usually a temperature rise in the solution or the surroundings

Question 7

What name is given to a small metal can used to hold water that is heated by a chemical reaction?

Answer 7

Calorimeter

Question 8

What is the biggest source of error in calorimetry experiments?

Answer 8

Heat loss is the biggest source of error in calorimetry experiments. It is important to use the thermometer carefully, but it is rarely the source of a large amount of error.