Combustion & Flame

1. Cheap,large amount of heat and no pollutant produced
5. source of heat energy
8. When substances vapourise during burning Carbonmonooxide Incomplete combustion produces this gas
10. Material suddenly burst into flames
14. Calorific Value of fuel efficiency
17. On the head of the matchstick and burns
18. which combust easily.
20. Caused by increased concentration of carbon dioxide
22. dry powder of chemical is used in fire extinguisher
23. Safe fuel, used in automobiles
25. Substance that undergoes combustion.
26. Large amount of gas, heat and light produced
27. lowest temperature at which a substance catch fire

2. combustible Material which do not combust easily
3. Quick burning with lot of heat and light
4. Unburnt carbon particles are present
6. complete combustion takes place
7. Substances which catch fire at very low temperature
9. Used for fire due to electricity or oil
11. Oxides of sulphur and nitrogen dissolves in rainwater Sun produce heat and light by nuclear reaction
12. Amount of energy produced on complete combustion of 1kg of fuel
13. fuel for the body
15. Required for burning
16. Does not produce flame
18. A chemical process in which substance react with oxygen
19. Most corrosive gas
21. the most common fire extinguisher
24. best extinguisher