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QUESTION 1 

  • What is the coefficient preceding O 2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers?  
  • __ C 18H 36O 2 + __ O 2 -> __ CO 2 + __ H 2O 

1 

8 

9 

26 

27 


QUESTION 2 

  • Which of these chemical equations describes a precipitation reaction? 


2H2(g) + O2(g) ----> 2H2O(l) 

CaBr2(aq) + H2SO4(aq) ------> CaSO4(s) + 2HBr(g) 

2KNO3(s) -------> 2KNO2(aq) + O2(g) 

2KBr(aq) + Cl2(g) ------> 2KCl(aq) + Br2(l) 

2Al(s) + 3H2SO4(aq) ------> Al2(SO4)3(aq) + 3H2(g) 

  

QUESTION 3 

  • Which one of these equations describes a redox reaction? 

2Al(s) + 3H2SO4(aq) -----> Al2(SO4)3(aq) + 3H2(g) 

2KBr(aq) + Pb(NO3)2(aq) ----> 2KNO3(aq) + PbBr2(s) 

CaBr2(aq) + H2SO4(aq) ------> CaSO4(s) + 2HBr(g) 

H+(aq) + OH-(aq) ------> H2O(l) 

CO32-(aq) + HSO4-(aq) -> HCO3-(aq) + SO42-(aq) 

 

QUESTION 4 

  • When the equation  CrO4-2      ---->     Cr +3 (acidic solution) is balanced using the smallest whole number coefficients, the coefficient of H +1 is: 

1 

2 

4 

6 

8 

 

 

 

QUESTION 5 

  • Iron(II) sulfate reacts with potassium hydroxide in aqueous solution to form a precipitate. The net ionic equation for this reaction is: 


Fe+2(aq) + SO4-2(aq)      ---->           FeSO4(s) 

2K+1(aq) + SO4-2(aq)        --->        K2SO4(s) 

2Fe+3(aq) + 3SO4 -2aq)           ---->     Fe2(SO4)3(s) 

Fe+2(aq) + 2OH-1(aq)    ---->       Fe(OH)2(s) 

 

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