June 2013 Chemistry Regents #51-53

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

 

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Question

 

  Base your answers to questions 51 through 53 on the information below and on your knowledge of chemistry.

 

When magnesium is ignited in air, the magnesium reacts with oxygen and nitrogen.

The reaction between magnesium and nitrogen is represented by the unbalanced equation below.

Mg(s) + N2(g) --> Mg3N2(s)

51 Balance the equation in your answer booklet for the reaction between magnesium and  nitrogen, using the smallest whole-number coefficients. [1]

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52 In the ground state, which noble gas has atoms with the same electron configuration as  a magnesium ion? [1]

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Neon  or Ne

53 Explain, in terms of electrons, why an atom of the metal in this reaction forms an ion  that has a smaller radius than its atom. [1]

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An atom of magnesium loses its outer shell electrons to form the Mg2+ ion.

The electron configuration of a magnesium atom is 2-8-2, and the electron configuration of the magnesium ion is 2-8.

An atom of the metal loses electrons to form the ion.

 

on to Questions 54-56

 

 

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

 

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