January 2010 Chemistry Regents #72-75

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 

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Questions

Base your answers to questions 72 through 75 on the information below.

An experiment is performed to determine how concentration affects the rate of reaction. In each of four trials, equal volumes of solution A and solution B are mixed while temperature and pressure are held constant. The concentration of solution B is held constant, but the concentration of solution A is varied. The concentration of solution A and the time for the reaction to go to completion for each trial are recorded in the data table below.

72 Describe the relationship between the concentration of solution A and the time for the reaction to go to completion. [1]

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As the concentration of A is decreased, the rate of reaction decreases.

(Note--rate and time are indirectly proportional)

As the concentration of solution A was decreased, the time for the reaction to go to completion increased.

73 On the grid in your answer booklet, mark an appropriate scale on the axis labeled “Reaction Time (s).” [1]

74 On the same grid, plot the data from the data table. Circle and connect the points. [1]

Link TO SEE THE ANSWER 73 and 74

75 Identify one factor, other than the concentration of the solutions, that can affect the rate of this reaction. [1]

HIGHLIGHT TO SEE THE ANSWER

temperature

addition of a catalyst

On to Questions 76-78

 

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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