Question

Examples of pure substances are elements and _________.
A mixtures
B compounds
Iron and aluminum are examples of _____________.
A pure substances
B compounds
A ____________ is a physical combination of things that can be separated.
A mixture
B compound
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Answer 1

1) B — compounds.
2) A — pure substances. (Iron and aluminum are elements, which are pure substances.)
3) A — mixture. (A mixture is a physical combination that can be separated by physical means.)