Key Area 3: Energy from Fuels

Question 1

A reaction that releases heat energy is described as

Answer 1

exothermic

Question 2

A reaction or process that takes in heat energy is described as

Answer 2

endothermic

Question 3

In combustion a substance reacts with

Answer 3

oxygen (releasing energy)

Question 4

Hydrocarbons and alcohols burn in plentiful supply of oxygen to produce

Answer 4

carbon dioxide and water

Question 5

Equations can be written for the

Answer 5

complete combustion of hydrocarbons and alcohol

Question 6

Fuels burn releasing

Answer 6

different quantities of energy

Question 7

The quantity of heat energy released can be determined by

Answer 7

Eh = cm^T

Question 8

Calculations can involve heating substances other than

Answer 8

water

Question 9

100 cm3 = 100g = ?

Answer 9

0.1 kg

Question 10

Eh (energy) in

Answer 10

kJ

Question 11

c = the specific heat capacity of the water

Answer 11

4.18 kJ

Question 12

m = the mass

Answer 12

in kg of the water being heated (if you know the volume you know the mass)

Question 13

^T = the rise in temperature in

Answer 13

degrees celsius

Question 14

If fuel is burned with limited supply of oxygen what is produced??

Answer 14

Carbon monoxide

Question 15

Explain why only the results of the 2nd and 3rd tires are used to calculate this average?

Answer 15

Because they are concordant. The first one is rough (not concordant)