Chemical Reactions Test Period 4

25 Questions | Total Attempts: 121

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Chemical Reactions Test Period 4

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 what we learned about reaction rates how could you get alka seltzer to dissolve the fastest 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

  • 21. 
    Activation energy is the energy needed to get a reaction started. Usually, this is the heat energy of the reactants. If something has a high activation energy, then it is hard to get the reaction to happen unless the temperature is high. If the bond between A-A or B-B is very strong, then the activation energy for the reaction will be
    • A. 

      High

    • B. 

      Low

    • C. 

      The bond strength will not affect the activation energy

  • 22. 
    Would it still be safe drink the milk if you increased the temperature
    • A. 

      Yes....as long as the milk flavor did not start to decrease

    • B. 

      No...it needs to stay this cold

  • 23. 
    If I could not increase the temperature how else could I get these bonds to break?
    • A. 

      Increase the pressure

    • B. 

      Increase the concentration

    • C. 

      Add a catalyst

    • D. 

      Decrease the temperature

  • 24. 
    Is the formation of product AB likely to occur?
    • A. 

      Yes because the bond strength of AB is strong

    • B. 

      No because the bond strength of the reactants is strong but the strength of the product bond is weak

    • C. 

      Not enough information

    • D. 

      Yes because the bond strength of reactants and products is the same

  • 25. 
    Choose the correct reaction below: One molecule of A2 and one of B2 (the reactants), chemically react to form 2 molecules of AB (the products).
    • A. 

      A + A --> A2

    • B. 

      AB --> A + B

    • C. 

      A2 + B2 --> 2AB

    • D. 

      2AB --> A2 + B2