Explosion of a cracker is a chemical change . Explain
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Answer:
Explosion of a cracker is a chemical change because the explosive reactants are transformed into gaseous products along with heat, light and sound which cannot be reversed. Hence, it is a chemical change
#CHEMICAL CHANGE....
Combustion, slow or explosively fast, is always a combination of physical change and basic chemical reactions. You can burn a firecracker or set it off so let’s cover both. When a firecracker doesn’t go off, many will break it open and ignite the powder. There is usually no explosion. The first thing that happens is heat from the ignition source starts the decomposition of an oxidizer like potassium chlorate (KClO3). Then the combustibles like aluminum power and sulfur ignite. Now we’re into chemistry. The released oxygen produces aluminum oxide, sulfur dioxide, heat and light. The sulfur can combine with some of the potassium (K) to form potassium sulfide that gives that characteristic firecracker aroma (or bad smell if your not a chemist). Less common gunpowder firecrackers use potassium nitrate (KNO3), sulfur (S) and carbon (C) to produce gases and solids.
Now that the chemistry is done, we have light, heat, smoke (oxide particles and potassium compounds) and that’s more about physics. The light and some of the heat as infrared is radiated away as electromagnetic radiation and this is in the realm of physics. But if we exploded the firecracker, all of the same phenomena would occur with the addition of fracturing the casing and producing a sound wave (physics). Additionally, the fuse would ignite but it still a combination of physical change and chemical reactions.