Science

8th

grade

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Chemistry

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  • Multiple Choice
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    30 seconds
    1 pt
    What is a pure substance that cannot be broken down into any other substance by physical or chemical means. Ex: Gold, Silver, Oxygen, & Nitrogen
    element
    compound
    mixture
    salad
  • Multiple Choice
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    30 seconds
    1 pt
    What is a  pure substance made of two or more elements chemically combined in a set ratio. Ex: CO2 has a set ratio of 1:2, meaning for every one carbon atom there are two oxygen atoms.
    element
    compound
    mixture
    salad
  • Multiple Choice
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    30 seconds
    1 pt
    What is an atom which has gained or last electrons called?
    isotope
    atom
    ion
    balanced
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