August 2015 Chemistry Regents #69-72

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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

Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

 

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Question 69-72

 

 

Base your answers to questions 69 through 72 on the information below and on your knowledge of chemistry.

In a laboratory investigation, ammonium chloride was dissolved in water. Laboratory procedures and corresponding observations made by a student during the investigation are shown in the table below.

69 Identify two types of bonds in the solute. [1]

Answer-->covalent and ionic

 70 State evidence from the investigation that indicates the NH4Cl(aq) solution is saturated. [1]

Answer-->  Not all NH4Cl dissolved.

71 State evidence from the investigation that indicates the process of dissolving the NH4Cl(s) in water is endothermic. [1]

Answer-->  The temperature decreased during the dissolving.

72 State the observation that would be made if procedure 3 is repeated with the original temperature of the H2O(ℓ) at 98C. [1]

Answer-->  No NH4Cl(s) observed after the stirring.

on to Questions 73-74

 

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 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

 

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