June 2014 Chemistry Regents #46-50

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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Questions

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Explanations

46 What is the oxidation number of manganese in KMnO4?

(1) +7     (3) +3

(2) +2      (4) +4

1 link K is +1

O is -2 x 4 so -8

Leaving Mn to be +7 so it all adds to 0

47  When the pH of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is

(1) decreased by a factor of 2

(2) decreased by a factor of 10

(3) increased by a factor of 2

(4) increased by a factor or 10

2 link each pH unit change is a 10 fold change in hydronium

hydronium increases if the pH decreases (more acidic) and decreases as the pH increase (more basic)

 

48 What is the color of the indicator thymol blue in a solution that has a pH of 11?

(1) red (3) pink

(2) blue (4) yellow

2 link table M 

thymol blue above 9.6 is blue

 

49  Which formulas represent compounds that are isomers of each other?

3 link isomer=same formula different structure

count the atoms, but is must be a different structure

50 One beneficial use of radioisotopes is

(1) detection of disease

(2) neutralization of an acid spill

(3) decreasing the dissolved O2(g) level in seawater

(4) increasing the concentration of CO2(g) in the atmosphere

1 link one of the many uses for radioactive elements

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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