Which of the following best defines a pure substance in the context of chemical…

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Problem

Which of the following best defines a pure substance in the context of chemical classification? (a)

\text{A uniform material whose composition may vary from one sample to another}

(b)

\text{A material composed of atoms of two or more elements combined in variable mass ratios}

(c)

\text{A material composed of only one type of particle that cannot be separated into other substances by physical means}

(d)

\text{Any solid that has a constant melting point regardless of its composition}