Science

9th

grade

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ATOMS AND MOLECULES

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  • 1. Multiple Choice
    30 seconds
    1 pt

    combination of atoms of same elements is known as

    molecule

    element

    compound

    atom

  • 2. Multiple Choice
    30 seconds
    1 pt

    symbol of potassium

    pb

    Na

    Fe

    k

  • 3. Multiple Choice
    30 seconds
    1 pt

    What does conservation of matter mean?

    Matter cycles through an ecosystem and 10% is lost as you move through each trophic level.

    Matter cannot be created, but can be destroyed.

    Matter cannot be created nor destroyed, and cycles through ecosystems.

    Matter and energy both move through ecosystems with 100% efficiency.

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