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Ch 14 and 15 Test

Quiz by Tracy

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35 questions
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  • Q1
    What is the most important indicator that a chemical change has occurred?
    it gives off heat
    it changes color
    it changes phases
    a new substance is formed
    30s
  • Q2
    How many carbon atoms in brown sugar? (C12H22O11)
    22
    12
    1
    11
    30s
  • Q3
    Which of the following is a covalent bond?
    Copper and Zinc
    Potassium and Chlorine
    sodium and chlorine
    hydrogen and oxygen
    30s
  • Q4
    How many carbon atoms in this formula? 3C12H22O11
    12
    15
    11
    36
    30s
  • Q5
    What is melting crayons an example of?
    chemical change
    nuclear change
    physical change
    chemical reaction
    30s
  • Q6
    What makes chemical bonds break?
    substances are combined in a solution
    molecules bump into each other with a lot of energy
    liquid dissoliving solids
    temperature change
    30s
  • Q7
    Is the following equation balanced?
    Question Image
    Yes
    No
    30s
  • Q8
    What is an example of a physical change
    leaves changing colors
    fireworks exploding
    phase change
    burning a match
    30s
  • Q9
    How do chemical bonds break?
    making a solution
    when molecules have enough energy, bump into each other and break
    forming a precipitate
    lowering the temperature
    30s
  • Q10
    What is the charge of an ionic compound?
    0
    3
    1
    2
    30s
  • Q11
    Which of the following is an ionic compound?
    MgO
    Cl2
    O2
    CH4
    30s
  • Q12
    How many oxygen atoms are present in the equation 4Mg + 3(O2) ----- 2(Mg2O3)
    4
    6
    2
    3
    30s
  • Q13
    What would decrease the rate of a chemical reaction?
    adding a catalyst
    increasing the surface area of a substance
    adding an inhibitor
    increasing the temperature
    30s
  • Q14
    Which of the following is a catalyst?
    lowers the activation enery of a reaction
    changes the reaction permenantly
    slows the rate of reaction
    stops a reaction
    30s
  • Q15
    What is the law of conservation of mass?
    the reactants have more mass than the products
    atoms are never gained or lost in a reaction
    atoms are created and destroyed
    the products will have more mass than the reactants
    30s

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