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Chemical pollution happens when certain compounds are improperly disposed of. This can affect the environment by disrupting the processes of the ecosystem. Chemical pollution happens when certain compounds are improperly disposed of. This can affect the environment by disrupting the processes of the ecosystem.
Wiktionary (0.00 / 0 votes) Rate this definition: chemical (Noun). Any specific chemical element or chemical compound. chemical (Noun). An artificial chemical compound. I color my hair with henna, not chemicals. chemical (Noun). An addictive drug.