Practice Quiz

MCAT Biology

Category - Chemistry

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Which of the following statements describes a difference between a mixture and a pure substance?
  1. A mixture tends to be homogenous, while a pure substance tends to be heterogeneous.
  2. A mixture has a specific melting point, while the melting point
    of a pure substance can vary.
  3. The density of a mixture can change with temperature, but the density of a pure substance cannot change.
  4. The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same.
Explanation
Answer: D - The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same.
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