January 2012 Chemistry Regents #72-74

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50 Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74 Questions 75-78  Questions 79-81  Questions 82-85

Question

Base your answers to questions 72 through 74 on the information below.   Iron has been used for thousands of years. In the air, iron corrodes. One reaction for the corrosion of iron is represented by the balanced equation below. In the presence of water, iron corrodes more quickly. This corrosion is represented by the unbalanced equation below. 72 Identify one substance in the passage that can not be broken down by a chemical change. [1] HIGHLIGHT TO SEE THE ANSWER Fe or O2 or Iron or Oxygen 73 Using equation 1, describe one chemical property of iron. [1] HIGHLIGHT TO SEE THE ANSWER Iron reacts with oxygen to form a compound. or An iron atom can lose three electrons. or The Fe atoms can form positive ions. or any other reaction 74 Balance the equation in 'Jour answer booklet, using the smallest whole-number coefficients. [1] link TO SEE THE ANSWER   on to Questions 75-78

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