6. Energy Changes

Question 1

1. What is the name given to reactions that take in energy?

Answer 1

1. Endothermic

Question 2

2. What is the name given to reactions that give out energy?

Answer 2

2. Exothermic

Question 3

3. In exothermic reactions what has more energy – the product or the reactant?

Answer 3

3. Reactant

Question 4

4. In an exothermic reaction what happens to the temperature of the surroundings?

Answer 4

4. Increases

Question 5

5. What is an example of an exothermic reaction?

Answer 5

5. Combustion, oxidation, neutralisation

Question 6

6. What is an example of an endothermic reaction?

Answer 6

6. Thermal decomposition

Question 7

7. Draw the reaction profile for an exothermic reaction. Label the activation energy and total energy change.

Answer 7

Question 8

8. What is the activation energy?

Answer 8

8. Minimum energy particles must have to start a reaction.