June 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 51-53 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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Question 69-72

 

 

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

In 1828, Friedrich Wohler produced urea when he heated a solution of ammonium cyanate. This reaction is represented by the balanced equation below.

69 Identify the element in urea that makes it an organic compound. [1]

Answer-->Carbon or C

70 Determine the gram formula mass of the product. [1]

Answer--> 60 g/mol

71 Write the empirical formula for the product.

Answer-->   CH4N2O     in any order, must be consolidated to simplest formula

72 Explain why the balanced equation a conservation of atoms.

Answer--># of Atoms in equal # of atoms out

No atoms are lost  or gained in the reaction

on to Questions 73-75

 

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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