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A particle model of chemical reactions

Quiz by Oak National Academy: KS3 Science (2)

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6 questions
Show answers
  • Q1
    Match the word with its definition.
    Users link answers
    Linking
    30s
  • Q2
    In a chemical reaction, what happens to the atoms?
    Some atoms are destroyed.
    They are rearranged.
    New atoms are created.
    30s
  • Q3
    In the chemical equation 2H₂ + O₂ → 2H₂O, what are the reactants?
    O₂ only
    H₂O and O₂
    H₂ only
    H₂O
    H₂ and O₂
    30s
  • Q4
    Which of the following is a characteristic of a chemical reaction?
    Loss of atoms
    Changes in state
    Gain of atoms
    formation of new substances
    30s
  • Q5
    After the reaction 2H₂ + O₂ → 2H₂O, what happens to the total number of atoms?
    Different reaction conditions would lead to different answers.
    It increases.
    It decreases.
    Not enough information is known, so it cannot be determined.
    It remains the same.
    30s
  • Q6
    In the equation 2Na + Cl₂ → 2NaCl, what is the simplest ratio of sodium (Na) atoms to chlorine (Cl) atoms in the reactants?
    1:2
    2:1
    2:2
    1:1
    3:1
    30s

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