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Law of conservation of matter

Quiz by Susan Coffey

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10 questions
Show answers
  • Q1
    A student asks why the ashes from a fire have a much lower mass than the wood that was burned. Which is the correct answer to the student’s question?
    Gases are released into the air.
    Water inside the wood solidifies.
    Atoms in the wood are destroyed.
    Heat causes molecules to lose density.
    30s
  • Q2
    The reaction below shows potassium oxide being produced (KO₂) by combining oxygen (O₂) with potassium (K). The mass of potassium is 50 g and the mass of oxygen is 12 g. What is the mass of the product KO₂? O₂ + K ------> KO₂
    50 grams
    62 grams
    12 grams
    160 grams
    45s
  • Q3
    Iron (Fe) reacts with Oxygen (O) to form iron oxide (FeO) which is commonly called rust. 2Fe + 3O₂---> 2FeO₃ Which chemical formula shown below is the product of this reaction?
    a. Iron (Fe)
    3O₂
    2FeO₃
    Iron dioxide
    45s
  • Q4
    A balanced chemical equation reflects the idea that the mass of the products--
    equals the mass of the reactants
    is not related to the mass of the reactants
    is greater than the mass of the reactants
    is less than the mass of the reactants
    45s
  • Q5
    The law of conservation of mass can be demonstrated by a chemical reaction. Which of the models in the graphic best represents the law of conservation of matter?
    Question Image
    B
    C
    D
    A
    45s
  • Q6
    How many total atoms are on the reactant side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
    4
    0
    5
    3
    45s
  • Q7
    How many hydrogens are on the reactant side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
    0
    1
    3
    2
    45s
  • Q8
    How many chlorines are on the product side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
    1
    2
    0
    3
    45s
  • Q9
    How many total atoms are on the product side of this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
    0
    5
    4
    3
    45s
  • Q10
    What are the names of the elements involved in this chemical reaction? Zn + 2HCl ---> ZnCl₂ + H₂
    hydrogen, zinc, and carbon
    zinc, chlorine & helium
    carbon, hydrogen, & zirconium
    zinc, hydrogen, & chlorine
    45s

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