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29 December, 00:02

Which substance cannot be broken down by a chemical change? (1) ammonia (2) mercury (3) propane (4) water

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  1. 29 December, 04:00
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    Mercury is the correct answer. Mercury is an element, meaning it's the smallest piece of a substance that is still that substance. Ammonia, propane, and water are all compounds/molecules, which can be broken down into elements.
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