June 2015 Chemistry Regents #54-56

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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 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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Questions 54-56

 

 

Base your answers to questions 54 and 56 on the information below and on your knowledge of chemistry.

Three elements, represented by D, E, and , are located in Period . Some properties of these elements are listed in the table below. A students experimental result indicates that the density of element is 2.10g/cm3 at room temperature and standard pressure.

54 Identify the physical property in the table that could be used to differentiate the samples of the three elements from each other. [1]

Answer--> Density

55 Identify the group on the Periodic Table to which element D belongs. [1]

Answer--> Group 1   (also acceptable alkali metals)

56 Determine the percent error between the students experimental density and the accepted density of element . [1]

Answer--> 5.0%

work not required    %error  =((2.10-2.00)/2.00) x 100%

on to Questions 57-59

 

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 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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