January 2015 Chemistry Regents #62-63

Highlight to reveal answers and explanations

 

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 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

Other Regents Exams

 

 

  Base your answers to questions 62 through 63 on the information below.
The nuts, bolts, and hinges that attach some gates to a playground fence can be made of iron. The iron can react with oxygen in the air. The unbalanced equation representing this reaction is shown below.

___Fe(s) + ___O2(g) → ___Fe2O3(s)

62 Balance the equation in your answer booklet for the reaction, using the smallest whole-number coefficients. [1]

Answer==> 4Fe(s) + 3O2(g) → 2Fe2O3(s)

63 Determine the change in oxidation state for oxygen in this reaction. [1]

 
Answer==> From zero to negative two

on to Questions 64-65

 

 
 

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 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

Back to Regents Exams