Chemistry, 25.10.2019 12:43 izabellabyan

Two substances, a and z, are to be identified. substance a can not be broken down by a chemical change. substance z can be broken down by a chemical change. what can be concluded about these substances?
(1) both substances are elements.
(2) both substances are compounds.
(3) substance a is an element and substance z is a compound.
(4) substance a is a compound and substance z is an element.

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