Chapter 15 Energy Changes

Question 1

What is an endothermic reaction or process?

Answer 1

It a reaction or process which absorbs heat from its surrounding

Question 2

What does an endothermic reaction do?

Answer 2

Absorbs heat from surroundings, surrounding loses heat and the temperature of surrounding decreases

Question 3

Examples of endothermic reaction

Answer 3

1. Photosynthesis
2. Thermal decomposition
3. Melting
4. Boiling/ Evaporation
5. Bond breaking
6. Action of light on silver bromide in photographic films

Question 4

What is an exothermic reaction?

Answer 4

Exothermic reaction release heat to its surrounding, surrounding gains heat and the temperature of surrounding increases.

Question 5

Example of exothermic reaction?

Answer 5

1. Combustion
2. Respiration
3. Rusting
4. Neutralisation
5. Freezing
6. Condensation
7. Formation of bonds