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Which substance contains elements chemically combined in a fixed proportion?(1) manganese (2) metha

NYC Regents Exam Jan 2023


Which substance contains elements chemically combined in a fixed proportion? (1) manganese

(2) methane (3) silicon

(4) strontium


Solution: Compound is a substance that contains elements chemically combined in a fixed proportion. Manganese, silicon and strontium are all elements (can be found on the Periodic Table). Methane is the only compound and is therefore the correct answer 2.

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