Y8 Science Chemical Reactions

Question 1

Word equation to show combustion

Answer 1

Fuel + oxygen -> carbon dioxide + water

Question 2

Show combustion with a balanced symbol equation

Answer 2

CH4 + O2 -> CO2 + H2O

Question 3

Is combustion endothermic or exothermic?

Answer 3

Exothermic because it gives off heat to the surroundings

Question 4

Name different types of fuel

Answer 4

Natural gas, diesel and petroleum, ethanol and methanol, as well as hydrogen or other gases.

Question 5

What is thermal decomposition?

Answer 5

A chemical reaction in which a solid is heated to create another solid and a gas.

Question 6

Example of thermal decomposition

Answer 6

Calcium carbonate -> calcium oxide + carbon dioxide

Question 7

What are the elements of the fire triangle?

Answer 7

Fuel, heat and oxygen

Question 8

Define oxidation

Answer 8

When oxygen is added to a chemical in a reaction

Question 9

Define reduction

Answer 9

When oxygen is removed from a chemical in a reaction

Question 10

Why don’t metals react with oxygen without fuel?

Answer 10

Oxygen is lower in reactivity series and there is no catalyst.