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Which substance can be broken down by chemical means? (1) magnesium (3) mercury (2) manganese (4) carbon dioxide

Which substance can be broken down by chemical means? (1) magnesium (3) mercury (2) manganese (4) carbon dioxide
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Which substance can be broken down by chemical means?

(1) magnesium (3) mercury
(2) manganese (4) carbon dioxide

User IROEGBU
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1 Answer

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answer is (4). elements/ atoms can't be broken down by chemical means but molecules can.

1, 2 and 3 are elements but 4 is a molecule because it is made of more than one element; in this case, it is made of CARBON and OXYGEN.
User Ethouris
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