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the blackish-red stuff that forms on ketchup bottles is a chemical change because things that change colour are mostly chemical reactions i think that's the reason why but i am not sure , but i hope i helped whoever is reading this.

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13y ago

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Is that blackish red stuff that forms on old kectup bottles a physical change?

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Is the blackish-red stuff that forms on old ketchup bottles chemical change or physical change?

The blackish-red stuff that forms on old ketchup bottles is typically a result of oxidation and microbial growth, which indicates a chemical change. This change alters the chemical composition of the ketchup, leading to the formation of new substances. In contrast, physical changes do not involve changes in chemical identity. Therefore, this phenomenon is a chemical change.


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