2006-08-29 01:25:08 · 6 answers · asked by zo shirazi 1 in Science & Mathematics ➔ Chemistry
letting off a firework is a chemical reaction that also changes the physic of the reactants.
A purely physical change would be like pushing a spring, as it goes back and the microsturcture of the metal in the spring is unchanged.
Its a chemical reaction as there is a chemical reaction, its also irreversible and exothermic, releasing a lot of energy.
2006-08-29 03:50:59 · answer #1 · answered by harsh 2 · 0⤊ 0⤋
Both! as the chemical elements inside react to heat they, alter their chemical composition (ie burn). In doing this they release kinetic energy (the means of propulsion to the firework) from a previously stored potential energy state. Therefore a physical change occurs
2006-08-29 01:52:07 · answer #2 · answered by teaghee 2 · 0⤊ 1⤋
it's a chemical reaction. then a firework goes of, there is an explosion which is very similar to burning and makes a flame.
2006-08-29 01:36:20 · answer #3 · answered by CH4 3 · 0⤊ 0⤋
all the fireworks are chemical reaction, because the burning accures, and the oxygen in air contributes in reaction.
2006-08-29 01:44:39 · answer #4 · answered by aahs137 3 · 0⤊ 0⤋
It is a chemical reaction because the powder burns in the air (oxydation) and it is (irreversably) not powder any more.
2006-08-29 01:37:25 · answer #5 · answered by Bax 2 · 1⤊ 0⤋
chemical. the explosion is a chemical reaction.
2006-08-29 07:04:59 · answer #6 · answered by shiara_blade 6 · 0⤊ 0⤋