June 2012 Chemistry Regents #60-62

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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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  Base your answers to questions 60 through 62  on the information below.

Calcium reacts with water. This reaction is represented by the balanced equation below. The aqueous product of this reaction can be heated to evaporate the water, leaving a white solid, Ca(OH)2(s).

Ca(s) + H2O(l) ==> Ca(OH)2(aq) + H2(g)

60 Compare the electrical conductivity of the aqueous product in the reaction to the electrical conductivity of the white solid that remains after the water is evaporated from the solution. [1]

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the solution conducts electricity better than the white solid

or

Ca(OH)2(aq) is a good conductor and Ca(OH)2(s) is not

61 Write the chemical name of the base produced in the reaction. [1]

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calcium hydroxide  (it is on table L)

62 State one change in reaction conditions that will increase the rate of the reaction. [I]

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increase temp  or

increase surface area

NOT concentration (not solutions), or catalyst (not a condition)

on to Questions 63-65

 

 

 

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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