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Counting atoms

Quiz by Farkhunda

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30 questions
Show answers
  • Q1
    How many hydrogen atoms are in one molecule of water (H2O)?
    1
    2
    3
    4
    30s
  • Q2
    What is the total number of atoms in a molecule of carbon dioxide (CO2)?
    4
    2
    3
    5
    30s
  • Q3
    In a molecule of ammonia (NH3), how many nitrogen atoms are present?
    3
    4
    1
    2
    30s
  • Q4
    How many total atoms are in a glucose molecule (C6H12O6)?
    22
    24
    18
    20
    30s
  • Q5
    How many chlorine atoms are found in a molecule of calcium chloride (CaCl2)?
    4
    2
    1
    3
    30s
  • Q6
    What is the total number of atoms in a molecule of sulfuric acid (H2SO4)?
    5
    7
    6
    8
    30s
  • Q7
    How many oxygen atoms are in a molecule of ozone (O3)?
    2
    1
    4
    3
    30s
  • Q8
    How many carbon atoms are there in a molecule of methane (CH4)?
    2
    1
    4
    3
    30s
  • Q9
    What is the total number of atoms in a molecule of ethylene (C2H4)?
    6
    4
    5
    7
    30s
  • Q10
    How many nitrogen atoms are there in a molecule of dinitrogen tetroxide (N2O4)?
    2
    4
    3
    1
    30s
  • Q11
    Which of the following statements is true about physical changes?
    They always release energy.
    They result in a chemical reaction.
    They change the composition of the substance.
    They do not create new substances.
    30s
  • Q12
    Which of the following best represents a physical change?
    Boiling water
    Rusting metal
    Digesting food
    Baking bread
    30s
  • Q13
    Which of the following is an example of a chemical change?
    Dissolving sugar in water
    Melting ice
    Rust forming on iron
    Chopping wood
    30s
  • Q14
    What happens during a chemical change?
    New substances are formed.
    Energy is absorbed but no new substances are created.
    The substance changes shape only.
    The substance changes color but remains the same.
    30s
  • Q15
    Which of the following is NOT a sign of a chemical change?
    The substance changes shape.
    Heat is released or absorbed.
    Gas is produced.
    A color change occurs.
    30s

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