January 2016 Chemistry Regents #51-53

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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 51 through 53 on the information below and on your knowledge of chemistry.

51 Based on Table H, state the vapor pressure of ethanol at 75C. [1]

Answer-->Anything from 84 to 87 kPa

52 Show a numerical setup for calculating the percent composition by mass of silicon in SiO3. [1]

Answer-->(28.1/60.1) x 100%

53 Explain, in terms of element classification, why K2O is an ionic compound. [1]

Answer-->K is a metal and O is a nonmetal

 

 

 
 

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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