Chemical Reactions Test Period 1

20 Questions | Total Attempts: 559

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Chemical Reactions Test Period 1

Chemical Reactions


Questions and Answers
  • 1. 
    When bonds break and rearrange to form new chemicals it is called a......
    • A. 

      Physical Change

    • B. 

      Law of Proportions

    • C. 

      Chemical Reaction

    • D. 

      Chemical Property

  • 2. 
    What is the difference between a physical change and a chemical reaction?
    • A. 

      In a chemical recation new atoms are formed

    • B. 

      In a chemical change bonds are broken and atoms are rearranged

    • C. 

      In a physical change atoms are lost

    • D. 

      In a physical change bonds are broken but in a chemical reaction they are not broken

  • 3. 
    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___H2 + ___O2 => ___H2O
  • 4. 
    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___C3H8 + ___O2 => ___CO2 + ___H2O
  • 5. 
    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___Al(OH)3 + ___H2SO4 => ___Al2(SO4)3 + ___H2O
  • 6. 
    Why do chemist need to work with balanced equations?
    • A. 

      Because of the law of conservation of energy

    • B. 

      Because they just want to

    • C. 

      Because of the law of conservation of mass

    • D. 

      Because they need to get fast reaction rates

  • 7. 
    The heaters in Army MRE's use a heater that give of heat when water is added.  This makes the food hot and scrumptious!!  What type of reaction is involved? 
    • A. 

      Endothermic

    • B. 

      Exothermic

  • 8. 
    At the 20 second mark of this experiment a magical reaction happens....what type is it?
    • A. 

      Endothermic

    • B. 

      Exothermic

  • 9. 
    What type of reaction is this? C10H22 + O2 => CO2 + H2O
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 10. 
    What type of reaction is this? KOH + HBr => KBr + H2O
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 11. 
    What type of reaction is this? N2 + H2 => NH3
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 12. 
    What type of reaction is this? Al(OH)3 + HBr => AlBr3 + H2O
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 13. 
    What type of reaction is this? Li + H2O => LiOH + H2
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 14. 
    What type of reaction is this?
    • A. 

      Synthesis

    • B. 

      Decomposition

    • C. 

      Combustion

    • D. 

      Single Replacement

    • E. 

      Double Replacement

  • 15. 
    After 400 seconds of this experiment there is less small chips remaining than there is large chips.   This demonstrates _____________ effect on reaction rate
    • A. 

      Temperature

    • B. 

      Surface Area

    • C. 

      Pressure

    • D. 

      Using a Catalyst

  • 16. 
    At a higher concentration the recation rate is faster and form a greater amount of ___________ in a shorter period of time
    • A. 

      Products

    • B. 

      Reagents (this means reactants)

  • 17. 
    In order to increase the reaction rate you can increase all of the following EXCEPT.....
    • A. 

      Temperature

    • B. 

      Concentration

    • C. 

      Pressure

    • D. 

      Surface Area

  • 18. 
    Using what you know about how temperature affects reaction rateswhat is the temperature of the middle beaker?
    • A. 

      Colder than the other twobeakers

    • B. 

      Hotter than the other two beakers

  • 19. 
    Using knowledge from the lab experiment and what we learned about reaction rates how could you get alka seltzer to dissolve the fastes so you could get the medicine in your body the fastest
    • A. 

      Use a whole tablet in cold water

    • B. 

      Use a crushed tablet in room temperature water

    • C. 

      Use a crushed tablet in warm water

    • D. 

      Use a whole tablet in warm water

  • 20. 
    If you put a whole tablet of alka seltzer in the same temperature water at the beach in florida and also on top of a mountain in colorado which one would dissolve first?
    • A. 

      Florida

    • B. 

      Colorado

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