Which substance is one that cannot be separated or broken down into simpler substances by chemical means? (Element, pure) table salt (NaCl)
gold wire (Au)
candle wax (CH2O)
water vapor (H2O)

gold wire (Au)

Explanation:

A substance that cannot be separated or broken down into simpler substances by chemical means is an element.

Between the given options only gold wire is an element, Au.

A way of knowing that it is an element is noticing that its formula is a single symbol which corresponds to an element found in the periodic table, unlike a combination of said symbols (like NaCl or H₂O).

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