June 2012 Chemistry Regents #52-55

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Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

 

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Base your answers to questions 52 through 55  on the information below.

The reaction between aluminum and an aqueous solution of copper(II) sulfate is represented by the unbalanced equation below.

Al(s) + CuSO4(aq) ==> Al2(SO4)3(aq) + Cu(s)

52 Identify the type of chemical reaction represented by the equation. [1]

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Single Replacement  or Redox

53 Balance the equation in your answer booklet, using the smallest whole-number coefficients. [1]

                   _____ Al(s) + _____ CuSO4(aq) ==> _____ Al2(SO4)3(aq) + _____ Cu(s)

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  __2__ Al(s) + __3__ CuSO4(aq) ==> __1__ Al2(SO4)3(aq) + __3_ Cu(s)

54 Explain why the equation represents a chemical change. [1]

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the products are different substances than the reactants

or

there is a loss and gain of electrons by the substances in the reaction

55 Determine the total mass of Cu produced when 1.08 grams of AI reacts completely with 9.58 grams of CuSO, to produce 6.85 grams of Al2(SO4)3.[1]

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3.81g

mass in must equal  the mass out

1.08g + 9.58g=10.66g in

10.66g=6.85g + X out

on to Questions 56-59

 

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

 

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