Atom, Elements, and Compound Quiz

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Check your mastery on this topic right away! Only takes 5 minutes and you surely do great on your exam.

Quiz Questions

• 1.
  Which of these is the smallest particle?

  • A.
    An atom

    (Correct Answer)

    Explanation: The smallest particle is an atom
  • B.
    A molecule
  • C.
    A speck of dust
• 2.
  Which of these is the correct symbol for magnesium?

  • A.
    MG
  • B.
    mg
  • C.
    Mg

    (Correct Answer)

    Explanation: The symbol for Magnesium is Mg. When two letters are used, the first letter is always upper case.
• 3.
  Which statement about atoms and molecule is correct?

  • A.
    Elements always exist as separate atoms
  • B.
    Elements always exist as pairs of atoms called molecules
  • C.
    Elements and compounds can exist as molecules

    (Correct Answer)

    Explanation: Elements and compounds can exist as molecules
• 4.
  How many different atoms are there in a compound?

  • A.
    One
  • B.
    Always two
  • C.
    Two or more

    (Correct Answer)

    Explanation: There are two or more atoms in a compound
• 5.
  Approximately, how many elements are there?

  • A.
    100

    (Correct Answer)

    Explanation: There are approximately 100 elements listed on the periodic table.
  • B.
    40
  • C.
    1,000,000
• 6.
  Which one is a compound?

  • A.
    Water

    (Correct Answer)

    Explanation: Water is compound because it is made from hydrogen and oxygen.
  • B.
    Hydrogen
  • C.
    Helium
• 7.
  Which of these contains two carbon atoms and six hydrogen atoms?

  • A.
    CH4
  • B.
    C2H6

    (Correct Answer)

    Explanation: C2H6 contains six atoms of hydrogen.
  • C.
    C2H4
• 8.
  Which of these contains four hydrogen atoms?

  • A.
    CH3OH

    (Correct Answer)

    Explanation: CH3OH contains four hydrogen atoms.
  • B.
    H2O
  • C.
    H2O2
• 9.
  How many atoms are there in total in a molecule of sulfur trioxide, SO3?

  • A.
    Two
  • B.
    Three
  • C.
    Four

    (Correct Answer)

    Explanation: There are four atoms in total in a molecule of sulfur trioxide.
• 10.
  Why does air not have a definite formula?

  • A.
    It contains different amounts of water depending on where you are
  • B.
    It depends on the temperature
  • C.
    It is not a compound

    (Correct Answer)

    Explanation: Air is a mixture, so it doesn't have a definite formula.

Quiz Outcomes

• 1.
  0 to 3 correct:

  It is okay.

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  Smile! It's not the end of the world. You can always try again. Nothing is impossible, right? Believe in yourself and retest. I'm 100% sure you can do it better than before.
• 2.
  4 to 7 correct:

  NEVER ENOUGH!

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  Even the moon needs to be in the darkness to shine. You are so much capable than this. Let's try again.
• 3.
  8 to 10 correct:

  Highly Intelligent!

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  There must be something in your DNA that makes you this amazingly smart! You should embrace yourself by learning more about Atom, Elements, and Compound. Who knows you can be the next Marie Curie?