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Science, Chemistry

9th

grade

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Chemistry

9
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10 questions

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  • 1. Multiple Choice
    20 seconds
    1 pt

    1. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

    (i) Increasing pressure on hydrogen contained in a closed container

    (ii) Some hydrogen gas leaking out of the container

    iii) Increasing the volume of the container of hydrogen gas

    iv) Adding more hydrogen gas to the container without increasing the volume of the container

    (a) (i) and (iii)

    (b) (i) and (iv)

    (c) (ii) and (iii)

    (d) (ii) and (iv)

  • 2. Multiple Choice
    20 seconds
    1 pt

    2. When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

    (a) Air is heavier than bromine

    b) Both air and bromine have the same density

    (c) Bromine is heavier than air

    d) Bromine cannot be heavier than air because it is going upwards against gravity

  • 3. Multiple Choice
    20 seconds
    1 pt

    Which one of the following statements is not true?

    a) The molecules in a solid vibrate about a fixed position

    b) The molecules in a liquid are arranged in a regular pattern

    c) The molecules in a gas exert negligibly small forces on each other, except during collisions

    d) The molecules of a gas occupy all the space available

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