Combustion And Flame

Question 1

Combustion

Answer 1

Reaction of substance with oxygen to give heat

Question 2

Fuel

Answer 2

A substance which can combust

Question 3

Ignition temperature

Answer 3

Lowest temperature at which a substance can combust

Question 4

Matchstick ignition

Answer 4

Friction between the glass and head which converts red phosphorus into white phosphorus which reacts with potassium chlorate which in turn makes heat which causes the antimony trisulphide to ignite

Question 4

Matchstick ignition

Answer 4

Friction between the glass and head which converts red phosphorus into white phosphorus which reacts with potassium chlorate which in turn makes heat which causes the antimony trisulphide to ignite

Question 5

Egyptian matchsticks

Answer 5

Pinewood dipped in sulphur

Question 6

Victorian matchsticks

Answer 6

Antimony trisulphide + potassium chlorate + White phosphorus (unsafe) + glue

Question 7

Inflammable substances

Answer 7

Thing that combust on low temperature

Question 8

Fire extinguisher

Answer 8

Substance which help cut off one or more of the requirements for combustion. E.g., Oxygen, heat or both

Question 9

CO2 extinguisher

Answer 9

For electrical fires and oil related fires.

Reduces temperature and oxygen

Question 10

Water extinguisher

Answer 10

For wood and paper related fires. If used for an electrical fire it will conduct electricity and harm the person
If used for oil fires it will sink as water has less density than oil

Question 11

Rapid combustion

Answer 11

When substance burn rapidly and gives out heat and light

Question 12

Spontaneous combustion

Answer 12

When substance combusts without any apparant reason

Question 13

Explosion

Answer 13

Sudden combustion resulting in a great deal of heat light and sound

Question 14

Flame

Answer 14

Combustion of vapourised fuels

Question 15

Non luminous zones

Answer 15

Hottest part, zone of complete combustion, least amount of unburnt carbon

Question 16

Luminous zones

Answer 16

Less hot than non luminous zones, zone of incomplete combustion, more amounts of unburnt carbon particles than non luminous zones

Question 17

Dark zones

Answer 17

Least amount of heat, zone of least combustion, most amount of unburnt carbon particles

Question 18

Fuel

Answer 18

Combustible substance

Question 19

Ideal fuel

Answer 19

Readily available, cheap, burn at low temperature, gives a lot of heat, doesn’t produce pollution

Question 20

Calorific value

Answer 20

Amount of energy produced by complete combustion of 1kg fuel

Question 21

Cow dung cakes

Answer 21

6000-8000 KJ/Kg

Question 22

Wood

Answer 22

17000-22000 KJ/Kg

Question 23

Coal

Answer 23

25000-33000 KJ/Kg

Question 24

Biogas

Answer 24

35000-40000 KJ/Kg

Question 25

Petrol, Diese, kerosene

Answer 25

45000 KJ/Kg

Question 26

CNG, methane

Answer 26

50000 KJ/kg

Question 27

LPG

Answer 27

55000 KJ/Kg

Question 28

Hydrogen

Answer 28

150000 KJ/Kg

Question 29

Carbon fuels

Answer 29

Coal, wood, petroleum etc., Produce unburnt carbon particles Causes respiratory disorders

Question 30

Incomplete combustion

Answer 30

Produces CO which kills human by reducing oxygen carrying capacity of blood

Question 31

Global warming

Answer 31

Caused by excess of CO2, melting of polar ice caps etc.

Question 32

Sulphur oxides

Answer 32

Caused by diesel and coal, highly corrosive and suffocating, causes acid rain

Question 33

Nitrous oxides

Answer 33

Caused by petrol, produce acid rain

Question 34

CNG

Answer 34

Clean fuel