January 2014 Chemistry Regents #55-57

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

Questions 51-54 Questions 55-57 Questions 58-61 Questions 62-63 Questions 64-65 Questions 66-70

Questions 71-75 Questions 76-77 Questions 78-81 Questions 82-85

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Base your answers to questions 55 to 57 on the information below.

The compounds KNO3 and NaNO3 are soluble in water.


55 Compare the entropy of 30. grams of solid KNO3 at 20.C with the entropy of 30. grams of KNO3 dissolved in 100. grams of water at 20.C. [1]

Answer==>   the solid has less entropy


56 Explain why the total thermal energy of a sample containing 22.2 grams of NaNO3 dissolved in 200. grams of water at 20.C is greater than the total thermal energy of a sample containing 11.1 grams of NaNO3 dissolved in 100. grams of water at 20.C. [1]

Answer==> 22.2g produces more heat than 11.1g when dissolved


57 Compare the boiling point of a NaNO3 solution at standard pressure to the boiling point of water at standard pressure. [1]

Answer==> the solution has a higher boiling point

 

 

 
 

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

Questions 51-54 Questions 55-57 Questions 58-61 Questions 62-63 Questions 64-65 Questions 66-70

Questions 71-75 Questions 76-77 Questions 78-81 Questions 82-85

 

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