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

Respuesta :

JavierCollante
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.
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