June 2014 Chemistry Regents #80-82

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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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Question 80-82

 

 

Base your answers to questions 80 through 82 on the information below and on your knowledge of chemistry.

A few pieces of dry ice, CO2(s), at -78C are placed in a flask that contains air at 21C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.

80 State the direction of heat flow that occurs between the dry ice and the air in the flask. [I]

Answer--> air to the dry ice

81 Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1]

Answer--> sublimation

82 Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon. [I]

Answer--> The CO2 in the dry ice has less entropy

on to Questions 83-85

 

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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