August 2015 Chemistry Regents #55-57

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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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Questions 55-57

 

 

55 Given the formula for heptanal:

Determine the gram-formula mass of heptanal. [1]

Answer-->114 g/mol

56 Compare the mass of a proton to the mass of an electron. [1]

Answer-->mass of a proton is greater than the mass of an electron

57 In nature, 1.07% of the atoms in a carbon sample are C-13 atoms. In the space in your answer booklet, show a numerical setup for calculating the number of C-13 atoms in a sample containing 3.28x1024 atoms of carbon. [1]

Answer--> (0.0107)*3.28x1024

on to Questions 58-59

 

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 51-54 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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