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Science

9th

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Grade 9: Atoms, molecules and compounds

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12 questions

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  • 1. Multiple Choice
    5 minutes
    1 pt
    Carbon dioxide is abbreviated as CO2 because it is made up of 1 carbon atom and 2 oxygen atoms. Carbon dioxide is a/an...
    Colloid because it has carbon in it
    Compound because it is a molecule with more than one type of atom
    Atom because it is the smallest unit of carbon dioxide that exists
    Element because carbon and oxygen are both in the periodic table of elements
  • 2. Multiple Choice
    5 minutes
    1 pt
    Iron is a metal that is mined from the earth. Iron metal is used to make many different things, including buildings and soup cans. Iron is made of only 1 type of atom. Iron is a/an...
    Atomic number
    Compound
    Element
    Atomic weight
  • 3. Multiple Choice
    30 seconds
    1 pt
    Atoms are made up of : 
    water
    protons neutrons and electons
    electrons and protons
    energy
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