Energy Changes

Question 1

What is exothermic reaction

Answer 1

Energy transferred to the surroundings so the temperature of the surroundings increase

Question 2

Name some exothermic reaction

Answer 2

Combustion
Oxidation
Naturalization

Question 3

What is an endothermic reaction

Answer 3

Energy is transferred from the surroundings so the temperature in the surroundings decreases

Question 4

Name some types of endothermic reactions

Answer 4

Thermal decomposition
The reaction of citric acid and sodium hydrogencarbonate


Question 5

How can chemical reactions occur

Answer 5

Chemical reactions can only occur when re-creating particles collide with each other and with sufficient energy.

Question 6

The minimum amount of energy that particles must have to react is called

Answer 6

Activation energy

Question 7

During chemical reactions what happens

Answer 7

Energy must be supplied to break bonds in the reactants then energy is released when the bonds in the products are formed