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8.6E Law of Conservation of Matter

Quiz by Gregorio Martinez

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14 questions
Show answers
  • Q1
    In the balanced chemical equation 2H2 + O2 -> 2H2O, how many oxygen atoms are present in the products?
    2
    4
    1
    0
    30s
  • Q2
    In the balanced chemical equation 4NH3 + 5O2 -> 4NO + 6H2O, how many oxygen atoms are present in the reactants?
    8
    5
    6
    10
    30s
  • Q3
    In the balanced chemical equation 2Al + 3Cl2 -> 2AlCl3, how many chlorine atoms are present in the products?
    6
    2
    4
    3
    30s
  • Q4
    In the balanced chemical equation 6H2 + 2N2 -> 4NH3, how many nitrogen atoms are present in the products?
    6
    4
    1
    2
    30s
  • Q5
    In the balanced chemical equation 5C4H10 + 13O2 -> 10CO2 + 10H2O, how many carbon atoms are present in the reactants?
    15
    10
    5
    20
    30s
  • Q6
    In the balanced chemical equation 2K + Br2 -> 2KBr, how many bromine atoms are present in the products?
    1
    2
    4
    3
    30s
  • Q7
    In the chemical equation 2Na + Cl2 -> 2NaCl, how many chlorine atoms are there in the products?
    1
    4
    2
    3
    30s
  • Q8
    In the equation 4Fe + 3O2 -> 2Fe2O3, how many iron atoms are present in the reactants?
    3
    4
    2
    6
    30s
  • Q9
    In the equation 2C4H10 + 13O2 -> 8CO2 + 10H2O, how many carbon atoms are present in the products?
    6
    8
    10
    4
    30s
  • Q10
    What does the law of conservation of matter state?
    Matter cannot be created or destroyed in a chemical reaction
    Matter can be destroyed but not created
    Matter can be created during chemical reactions
    Matter can change into energy without any loss
    30s
  • Q11
    Which of the following best illustrates the law of conservation of matter?
    Burning wood which turns into ash and smoke
    A chemical reaction where reactants combine to form products with the same total mass
    Dissolving sugar in water that completely disappears
    Cooking an egg where the original egg disappears
    30s
  • Q12
    In a closed system, if 50 grams of reactants undergo a chemical reaction, what will be the total mass of the products?
    100 grams
    25 grams
    75 grams
    50 grams
    30s
  • Q13
    If a sealed bag of popcorn is heated and pops, what happens to the total mass of the popcorn and the gas released?
    The total mass remains the same before and after popping
    The mass decreases because it turns into steam
    The mass becomes unpredictable after popping
    The mass increases due to added air
    30s
  • Q14
    When hydrogen and oxygen combine to form water, how does this relate to the law of conservation of matter?
    Some mass is lost when water is formed
    Only hydrogen or oxygen is used up in the process
    Water is formed by creating additional hydrogen and oxygen
    The total mass of hydrogen and oxygen equals the mass of the water produced
    30s

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