Chapter Test 5 - Chemical Bonds (30questions)

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Chapter Test 5 - Chemical Bonds (30questions)

The following questions and clipart are being used for educational purposes.   The test will correlate with VA SOLs PS. 2f; P4c; PS. 5a,c; PS. 6a,b,c. *Reference for questions: Prentice Hall Science Explorer, 2004Reference Clipart question 1-Hydrogen Peroxide: Ref. For educational purpose only: https://www. Snopes. Com/medical/homecure/peroxide. Asp Reference: Clipart, question 3, H2O: Free Gifs and Animation, https://www. Fg-a. Com Reference: Cartoons, questions3, 4      https://www. Usoe. K12. Ut. Us/curr/science/sciber00/8th/matter/sciber/chem type. Htm                                                       


Questions and Answers
  • 1. 
    What type of reaction occurs when a bottle of hydrogen peroxide eventually turns into a bottle of water and oxygen?   It breaks down!                                       * H2O2 is the formula for hydrogen peroxide.       (Remember the 2's should be smaller, a subscript, which drops below          the symbols).                                       
    • A. 

      Precipitate reaction

    • B. 

      Synthesis reaction

    • C. 

      Decomposition reaction

    • D. 

      Replacement reaction

  • 2. 
    What type of  chemical reaction is between copper oxide and carbon that produces copper and carbon dioxide:                                  (CuO + C    yields     Cu + CO2)*Look carefully at the location of  oxygen (0) on both sides of the chemical equation.  Study the cartoon below to get a clearer concept of what takes place in this chemical reaction:                   Notice, the guy in the orange shirt steals the date of the other guy. So, a part of one of the reactants trades places and is in a different place among the products. The girl is now dancing with the guy in the orange shirt, being swung up in the air.                         
    • A. 

      Replacement

    • B. 

      Synthesis

    • C. 

      Decompostion

    • D. 

      Precipitation

  • 3. 
    What is the process, for example A + B = AB, called when two or more substances combine to make a more complex compound?                                                                                                                                                                                                                                    In the cartoon, the skinny bird (reactant) and                 H2 + O   =   H2Othe worm (reactant) combine to make one product, a fat bird.                                                                                               (Water is also called dihydration monoxide)                                                                                                                                                                                                                                       
    • A. 

      Decomposition reaction

    • B. 

      Replacement reaction

    • C. 

      Precipitate reaction

    • D. 

      Synthesis reaction

  • 4. 
    What are the chemicals that act as biological catalysts by speeding up reactions in living things?
    • A. 

      Reactants

    • B. 

      Fuels

    • C. 

      Inhibitor

    • D. 

      Enzymes

  • 5. 
    Which of these is NOT one of the three things necessary to start and maintain a fire?                                    
    • A. 

      Carbon dioxide

    • B. 

      Oxygen

    • C. 

      Fuel

    • D. 

      Heat

  • 6. 
      What is the minimum amount of energy that has to be added to start a reaction?  
    • A. 

      Exothermic energy

    • B. 

      Number of particles

    • C. 

      Activation energy

    • D. 

      Energy

  • 7. 
    All of the folowing answers are evidence of a chemical change, but what is sure evidence of a chemical reaction?
    • A. 

      A color change as in leaves

    • B. 

      The production of a new material as ash from a burnt log

    • C. 

      Changes in properties

    • D. 

      The formation of a gas

  • 8. 
    A reaction that absorbs energy in the form of heat is described as
    • A. 

      Exothermic reaction

    • B. 

      Endothermic reaction

    • C. 

      Combustion

    • D. 

      Unbalanced

  • 9. 
    In a chemical reaction
    • A. 

      There is "no change" in energy

    • B. 

      Energy is "always absorbed"

    • C. 

      Energy is "always released"

    • D. 

      Energy is "either absorbed or released"

  • 10. 
    Which process changes matter into one or more new substances?      
    • A. 

      Physical change

    • B. 

      Chemical change

    • C. 

      Conservation

    • D. 

      Freezing

  • 11. 
    Water vapor in the air turns to liquid water in the form of rain.  This is an example of a      
    • A. 

      Chemical formula

    • B. 

      Chemical equation

    • C. 

      Chemical change

    • D. 

      Physical change

  • 12. 
    Every chemical reaction involves a change in
    • A. 

      Mass

    • B. 

      Energy

    • C. 

      Concentration

    • D. 

      State

  • 13. 
    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

  • 14. 
    A solid that forms from solution during a chemical reaction is called a
    • A. 

      Bond

    • B. 

      Reactant

    • C. 

      Chemical

    • D. 

      Precipitate

  • 15. 
    A shorter, easier way to show chemical reactions using symbols instead words, is called a
    • A. 

      Chemical formula

    • B. 

      Chemical equation

    • C. 

      Symbol

    • D. 

      Subscript

  • 16. 
    Symbols of elements are used to write the formula of compounds much like
    • A. 

      Numbers used to write coefficients

    • B. 

      Products are used to make reactants

    • C. 

      Letters are used to write words

    • D. 

      Numbers are used to balance equations

  • 17. 
    What type of energy releases heat?
    • A. 

      Endothermic reaction

    • B. 

      Molecular reaction

    • C. 

      High heat

    • D. 

      Exothermic reaction

  • 18. 
    In chemical reactions, what does the principle of conservation of mass mean?
    • A. 

      Matter is not changed

    • B. 

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

    • C. 

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

    • D. 

      Matter is not created or destroyed

  • 19. 
    What is a material used to decrease the rate of a chemical reaction?
    • A. 

      Inhibitor

    • B. 

      Catalyzt

    • C. 

      Enzyme

    • D. 

      Fuel

  • 20. 
    What is the best way to put out a small kitchen fire?
    • A. 

      Blow it out

    • B. 

      Use a garden hose

    • C. 

      Turn off appliances

    • D. 

      Use a home fire extinguisher

  • 21. 
    In what way can a fire be brought under control?
    • A. 

      Add fuel

    • B. 

      Add oxygen

    • C. 

      Remove oxygen

    • D. 

      Remove carbon dioxide

  • 22. 
    What is a rapid reaction between oxygen and a fuel is known as          
    • A. 

      Heat

    • B. 

      Combustion

    • C. 

      Activation

    • D. 

      Decomposition

  • 23. 
    How does water most affect fires?
    • A. 

      Increasing the temperature

    • B. 

      Producing carbon dioxide and removing fuel

    • C. 

      Decreasing activation energy

    • D. 

      Cooling the fire and preventing contact between oxygen and fuel

  • 24. 
    To balance the chemical equation in which hydrogen and oxygen are combined to yield water (H2 +  O2   yields   H2O), one would need to
    • A. 

      Change the coefficient of H2 to 2

    • B. 

      Change only the coefficient of O2 to 2

    • C. 

      Change the coefficient of both H2 and H2O to 2

    • D. 

      Change the coefficient of both O2 and H2O to 2

  • 25. 
    • A. 

      Increasing the concentration

    • B. 

      Increasing the surface area

    • C. 

      Adding a catalyst which increases the rate of reaction, but lowers the activation energy

    • D. 

      Increasing the mass

  • 26. 
    Which of the following is a balanced chemical equation? **You must write and show how you have worked each answer below on your answer sheet or it will not be counted correctly with just the "letter" or "equation". Tell if each is balanced or not balanced.  Write neatly!!!!!Remember: H2+ O     yields    H2O                                      H = 2                      H= 2                   O= 1                       O=1      Balanced                          
    • A. 

      H2O2 yields H2O + O2

    • B. 

      2 Fe2O3 + 3 C yields 4 Fe + 3 CO2

    • C. 

      SO2 + O2 + 2 H2O yields 4 H2SO4

    • D. 

      2 Mg + HCl yields MgCl2 + H2