combustion and flame

Question 1

combustion definition

Answer 1

chemical reaction in which a substance reacts with oxygen to produce heat.

Question 2

necessary conditions for flame

Answer 2

oxygen, fuel, heat

Question 3

lowest temperature at which a substance can catch flame

Answer 3

ignition temperature

Question 4

combustible/inflammable substance

Answer 4

a substance that undergoes the process of combustion, easily, with low ignition temperature

Question 5

incombustible substance

Answer 5

high ignition temperature

Question 6

types of combustion

Answer 6

rapid combustion, explosive combustion, spontaneous combustion

Question 7

spontaneous combustion

Answer 7

combustion where a material suddenly bursts into flames without the application of any apparent cause

Question 8

rapid combustion

Answer 8

combustion where gas burns rapidly with large amounts of heat and light, within a short period of time

Question 9

explosive combustion

Answer 9

sudden reation with the evolution of heat, light, and sound, generating and releasing large amounts of gas

Question 10

spontaneous combustion examples

Answer 10

a reaction where a material bursts into flames without the application of an apparent cause

Question 11

rapid combustion examples

Answer 11

stoves,

Question 12

explosive combustion examples

Answer 12

fireworks,

Question 13

parts of a flame

Answer 13

luminous zone, non luminous zone,

Question 14

luminous zone

Answer 14

the middle, brightest part of a flame that is characterized by a yellow or orange glow

Question 15

non luminous zone

Answer 15

outermost part of a flame, where complete combustion occurs as it is completely exposed to oxygen.

Question 16

how water helps control fire

Answer 16

1. water helps reduce the temperature of the combustible substance, bringing it below its ignition temperature- prevents the fire from spreading
2. water vapour surrounds the flame, cutting off the oxygen supply to the flame

Question 17

complete combustion

Answer 17

takes place when oxygen is sufficient, when a hydrocarbon reacts with oxygen and burns completely, only leaving water and carbon dioxide as byproducts

Question 18

incomplete combustion

Answer 18

combustion reaction that occurs when a fuel is not burned in the presence of enough oxygen, producing carbon monoxide, water, and particulate carbon(soot) as byproducts