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Pure substances and mixtures Knowledge-Based Practice

Chemistry · Matter · Chemistry · Classification of Matter

1 Chemistry practice questions on Pure substances and mixtures. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which of the following statements correctly distinguishes a pure substance from a mixture?

    • A) A pure substance can be separated into simpler components by physical methods such as filtration or distillation.
    • B) A mixture has sharp, fixed melting and boiling points that remain constant during phase changes.
    • C) A pure substance has a definite and uniform chemical composition throughout, whereas a mixture has variable composition.
    • D) A mixture consists of elements chemically bonded together in a fixed, definite ratio by mass.

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