Why rusting a chemical change and reversible change?
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Answer:
In a chemical reaction, the molecules of one substance break apart and join together with those of another substance to create a different compound (combination of molecules). Many chemical reactions are NON-REVERSIBLE CHANGES .You cannot turn a baked cake back into its raw ingredients. Some chemical reactions can be reversed, and re-formed into the original substances. These are REVERSIBLE CHANGES.
When the iron and magnesium in a firework burn, they react with oxygen and produce ash and smoke. They also release spectacular heat, light, and noise. Chemical changes produce new materials. They also usually give out or take in energy such as heat or light because chemical bonds have been broken and made.
When iron rusts, it reacts with oxygen in water or in air to create a new compound called iron oxide (rust). As in every chemical reaction, no mass is lost or gained. The same atoms from the original material are in the new materials, but in different places. If you weighed the iron oxide in this rusting ship, it would weigh the same as the original iron and oxygen.
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