combustion and flame

Question 1

combustion

Answer 1

a chemical process in which a substance burns in oxygen to give of heat and light is called combustion.

Question 2

rapid combustion

Answer 2

burns at a rapid rate, producing a very large amount of heat and light in a short period of time. ex) burning of wax

Question 3

spontaneous combustion

Answer 3

when a substance burns on its own without any external heat. ex) forest fires

Question 4

explosive combustion

Answer 4

occurs suddenly with large amounts of gas, heat and light with sound. ex) fire crakers

Question 5

flame

Answer 5

a region of burning gas is called flame

Question 6

innermost region of flame

Answer 6

this zone lacks oxygen so there is little to no combustion there. it appears black and is the least hot region of a flame

Question 7

middle zone

Answer 7

lacks oxygen so it produces carbon particles and carbon monoxide. the unburnt carbon becomes very hot. this is what makes the flame luminous and is the major part

Question 8

outer zone

Answer 8

hotest zone of a flame. it is oxygen rich so it burns at the highest temprature

Question 9

triangle of fire

Answer 9

oxygen, ignition temperature, combustible substances

Question 10

global warming

Answer 10

the rising of the average temperature of earth