P3- Energy From Fuels

Question 1

Fuel

Answer 1

Substance that contains stored energy in its chemical bonds
Stored energy released when burned

Question 2

Combustion

Answer 2

Scientific name for burning
Fuel combines with oxygen gas to produce heat and light energy
Exothermic reaction

Question 3

Exothermic reaction

Answer 3

Energy is given out to the surroundings

Question 4

Endothermic reaction

Answer 4

Energy taken in from surroundings

Question 5

Complete combustion

Answer 5

Plentiful supply of air in the air
Carbon dioxide and water are produced

Question 6

Incomplete combustion

Answer 6

Insufficient air supply
Carbon monoxide and water are produced

Question 7

Energy released from fuels formula

Answer 7

Eh=cm/\t
Eh- energy gained by water
c- specific heat capacity of water (4.18KJ)
m- mass of water in kg
/- change in temperature of water

Question 8

Gas tests

Answer 8

Oxygen- relights a glowing splint
Hydrogen- burns with a pop
Carbon dioxide- turns limewater from colourless to cloudy