June 2018 Chemistry Regents #83-85

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Question 83-85

 

 

Base your answers to questions 83 through 85 on the information below and on your knowledge of chemistry.

 

Carbon dioxide is slightly soluble in seawater. As carbon dioxide levels in the atmosphere increase, more CO2 dissolves in seawater, making the seawater more acidic because carbonic acid, H2CO3(aq), is formed. Seawater also contains aqueous calcium carbonate, CaCO3(aq), which is used by some marine organisms to make their hard exoskeletons. As the acidity of the sea water changes, the solubility of CaCO3 also changes, as shown in the graph below.

83 State the trend in the solubility of CaCO3 as seawater becomes more acidic. [1]

Answer--> As the seawater becomes more acidic, the solubility of CaCO3 increases.

84 State the color of bromcresol green in a sample of seawater in which the CaCO3 solubility is 10-2 M. [1]

Answer-->Blue

85 A sample of seawater has a pH of 8. Determine the new pH of the sample if the hydrogen ion concentration is increased by a factor of 100. [1]

Answer-->6

Conversion Table June 2018

raw score (out of 85)scale score (your grade)
 85
 65

 

Other Regents Exams

 

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

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-76  Questions 77-79  Questions 80-82  Questions 83-85 

 

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