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What chemicals do they put in fireworks and flares? Caesium and water? or something like that?
What are the physical and chemical changes that occur infireworks?
They use gunpowder to create the explosion. Gunpowder contains sulphur and potassium nitrate.
O, i see. So the firework is just like a mini rocket i guess. Thx
A firework will popularly use black powder as suggested (or otherwise known as Gun Powder). This is a mix between Potassium Nitrate, Sulphur and Activated Charcoal (KNO3, S and C)
The Caesium and water made me laugh, Caesium is highly dangerous, can you imagine what would happen if the firework was left in a damp enviornment? eg. a shed?
The sparkles and stuff can be made using different metals, eg for a green flame, they would use copper, iron filings in a fire would produce golden sparkles, magnesium would provide a bright, almost blinding white light, titanium has also been used before.
Where I said a firework uses black powder this isnt always strictly true, chinese fireworks have used M80 before and other similar mixtures
WebElements: the periodic table on the WWW [http://www.webelements.com/]