Grade 8 Chapter 6 Physical Science

20 Questions | Total Attempts: 90

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Grade 8 Chapter 6 Physical Science

Chapter Six deals with Chemical Reactions


Questions and Answers
  • 1. 
    Chemistry is...
    • A. 

      A characteristic of a substance that can be observed without changing the substance into another substance.

    • B. 

      The study of matter and how matter changes.

    • C. 

      Anything that has mass and takes up space.

    • D. 

      A rapid reaction between oxygen and a substance called a fuel.

  • 2. 
    What type of reaction is FeS + 2HCl à Fe Cl2 + H2S?
    • A. 

      A synthesis reaction.

    • B. 

      A decomposition reaction

    • C. 

      A single displacement reaction

    • D. 

      A double displacement reaction

  • 3. 
    Which of the following is NOT a correct inference that you can make about the  burning of gasoline?
    • A. 

      Chemical bonds are broken and others are formed.

    • B. 

      The reaction is a physical change.

    • C. 

      New substances are produced.

    • D. 

      Energy is released.

  • 4. 
    A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be...
    • A. 

      Balanced

    • B. 

      Unbalanced

    • C. 

      An incomplete reaction

    • D. 

      A replacement reaction

  • 5. 
    Anything that has mass and takes up space is considered...
    • A. 

      Matter

    • B. 

      Energy

    • C. 

      Chemistry

    • D. 

      Endothermic

  • 6. 
    What happens when chemical bonds break and new bonds form?
    • A. 

      A physical change.

    • B. 

      A chemical change.

    • C. 

      Matter is destroyed.

    • D. 

      Surface area increases

  • 7. 
    CaCO3   represents a chemical ...
    • A. 

      Symbol.

    • B. 

      Formula.

    • C. 

      Subscript.

    • D. 

      Reaction.

  • 8. 
    The only sure evidence for a chemical reaction is...
    • A. 

      The formation of a gas.

    • B. 

      A color change.

    • C. 

      The production of one or more new substances.

    • D. 

      Changes in properties.

  • 9. 
    A shorter, easier way to show chemical reactions, using symbols instead of words, is called a...
    • A. 

      Chemical equation

    • B. 

      Chemical formula

    • C. 

      Symbol

    • D. 

      Subscript

  • 10. 
    The substances listed on the left side of a chemical equation are the...
    • A. 

      Products

    • B. 

      Coefficients.

    • C. 

      Precipitates

    • D. 

      Reactants

  • 11. 
    In chemical reactions, what does the principle of conservation of matter mean?
    • A. 

      Matter is not created or destroyed.

    • B. 

      The total mass of the reactants is greater than the total mass of the products.

    • C. 

      The total mass of the reactants is less than the total mass of the products.

    • D. 

      Matter is not changed.

  • 12. 
    Which of the following is a balanced equation?
    • A. 

      H2O ---> H2O + O2

    • B. 

      2Fe2O3 + 3C --> 4Fe + 3CO2

    • C. 

      SO2 + O2 + 2H2O --> 4H2SO4

    • D. 

      2Mg + HCl --> MgCl2 + H2

  • 13. 
    Which two processes could be considered opposites?
    • A. 

      A decomposition reaction and a single replacement reaction.

    • B. 

      A single replacement reaction and a double replacement reaction.

    • C. 

      A precipitate reaction and a synthesis reaction

    • D. 

      A synthesis reaction and a decomposition reaction

  • 14. 
    A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a ....
    • A. 

      Synthesis reaction

    • B. 

      Decomposition reaction

    • C. 

      Replacement reaction

    • D. 

      Precipitate reaction

  • 15. 
    A chemical reaction that absorbs energy in the form of heat is described as...
    • A. 

      Endothermic

    • B. 

      Exothermic

    • C. 

      Combustion

    • D. 

      Unbalanced

  • 16. 
    Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide?
    • A. 

      2Na + O2 --- Na2O

    • B. 

      NOT THIS ONE

    • C. 

      NOT THIS ONE

    • D. 

      NOT THIS ONE

  • 17. 
    When a chemical reaction takes place in an open system....
    • A. 

      Matter can enter from or escape to the surroundings.

    • B. 

      Matter is not allowed to enter from or escape to the surroundings.

    • C. 

      Matter can enter from the surroundings, but can not escape to the surroundings.

    • D. 

      Matter can not move at all.

  • 18. 
    In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the...
    • A. 

      Number of atoms in each molecule in the reaction.

    • B. 

      Number of elements in the reaction.

    • C. 

      Number of molecules or atoms of each substance in the reaction.

    • D. 

      Number of molecules in each atom in the reaction.

  • 19. 
    Chemicals that act as biological catalysts by speeding up reactions in living things are...
    • A. 

      Inhibitors

    • B. 

      Enzymes

    • C. 

      Fuels

    • D. 

      Reactants

  • 20. 
    The number placed below an element's symbol in a chemical formula is called a....
    • A. 

      Subscript

    • B. 

      Coefficient

    • C. 

      Reactant

    • D. 

      Product

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