January 2016 Chemistry Regents #79-82

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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 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

 

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Questions

 

  Base your answers to questions 79 through 82 on the information below.

A student prepares two 141-gram mixtures, A and B. Each mixture consists of NH4Cl, sand, and H2O at 15C. Both mixtures are thoroughly stirred and allowed to stand. The mass of each component used to make the mixtures is listed in the data table below.

79 State evidence from the table indicating that the proportion of the components in a mixture can vary. [1]

Answer-->both mixtures have the same mass but different amounts of sand and NH4Cl

80 Which type of mixture is mixture B? [1]

Answer-->heterogeneous

81 Determine the temperature at which all of the NH4Clin mixture A dissolves to form a saturated solution. [1]

Answer-->any answer from 23 to 26 degrees C

82 Describe one property of sand that would enable the student to separate the sand from the other components in mixture B. [1]

Answer-->sand is insoluble in water and NH4Cl is soluble

 

 

 
 

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 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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