Science

8th

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Elements, Compounds and Mixtures

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15 questions

  • 1. Multiple Choice
    30 seconds
    1 pt

    Which of the following is an example of the formation of a mixture?

    Rust forming on an iron nail.

    Sugar crystals dissolving in water.

    Sodium and chlorine forming table salt.

    Hydrogen and oxygen reacting to produce oxygen.

  • 2. Multiple Choice
    30 seconds
    1 pt

    Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?

    Oxygen is more reactive than air.

    Oxygen has a higher density than air.

    Oxygen goes under a phase change, whereas air is always a gas.

    Oxygen contains only one substance, but air contains several substances.

  • 3. Multiple Choice
    30 seconds
    1 pt

    Which of the following is an example of of a container filled with a pure substance rather than with a mixture?

    A tire filled with air.

    A jar filled with salt water.

    A balloon filled with helium.

    A glass filled with chocolate milk.

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