Chemical Reactions Quiz: MCQ Exam!

12 Questions | Total Attempts: 9655

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Chemical Reaction Quizzes & Trivia

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Questions and Answers
  • 1. 
    Which one of the following represents a physical change?
    • A. 

      Iron rusting

    • B. 

      Paper burning

    • C. 

      Water freezing

    • D. 

      Dynamite exploding

  • 2. 
    .O {font-size:149%;} You can tell a chemical reaction because it always produces …
    • A. 

      A different substance

    • B. 

      Reactants

    • C. 

      A change of state

    • D. 

      Water

  • 3. 
    Slide 5 To balance a chemical equation, you should change only the…
    • A. 

      Subscripts

    • B. 

      Coefficients

    • C. 

      Chemical formulas

    • D. 

      Location of the arrow

  • 4. 
    Slide 6 .O {font-size:149%;} If iron combines with oxygen to make iron oxide, the reactants are…
    • A. 

      Iron oxide

    • B. 

      Iron and iron oxide

    • C. 

      Iron and oxygen

    • D. 

      Oxygen and iron oxide

  • 5. 
    Slide 7 How many carbon atoms are there in  C12H22O11?
    • A. 

      6

    • B. 

      12

    • C. 

      18

    • D. 

      45

  • 6. 
    Slide 8 How many oxygen atoms are in the product of this equation: 2H2 + O2 --> 2H2O
    • A. 

      2

    • B. 

      4

    • C. 

      8

    • D. 

      12

  • 7. 
    Slide 9 .O {font-size:149%;} Which one of the following is a chemical equation?
    • A. 

      Ice + heat --> water

    • B. 

      Iron + oxygen --> rust

    • C. 

      CO2

    • D. 

      C + O2 --> CO2

  • 8. 
    .O {font-size:149%;} Balance the following equation: Ag + O2 --> Ag2O
    • A. 

      Put a 2 in front of Ag

    • B. 

      Add a subscript 2 to the end of Ag2O

    • C. 

      Add a 4 in front of Ag and a 2 in front of Ag2O

    • D. 

      Add a 2 in front of Ag and a 1 in front of Ag2O

  • 9. 
    .O {font-size:149%;} In a chemical equation, the arrow means what?
    • A. 

      A reaction is happening.

    • B. 

      The two sides are equal.

    • C. 

      The products flow into reactants.

    • D. 

      The equation is balanced.

  • 10. 
    .O {font-size:149%;} The reactants include 7 grams of C and 4 grams of O. What is the total amount of C and O in the products?
    • A. 

      7 grams

    • B. 

      4 grams

    • C. 

      11 grams

    • D. 

      None

  • 11. 
    .O {font-size:149%;} Who first determined that the masses of the reactants and products must be the same?
    • A. 

      Pasteur

    • B. 

      Archimedes

    • C. 

      Galileo

    • D. 

      Lavoisier

  • 12. 
    .O {font-size:149%;} If you try to balance an equation by changing subscripts you change…
    • A. 

      The number of molecules of product

    • B. 

      The identity of the compound

    • C. 

      The atomic number

    • D. 

      The mass of the reactants