January 2011 Chemistry Regents #51-53

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Questions

Base your answers to questions 51 to 53 on the information below.

51 Explain, in terms of electronegativity difference, why the bond in a molecule of HF is more polar than the bond in a molecule of HI. [1]

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The electronegativity difference between H and F is greater than the electronegativity difference between H and I.

The difference for HF is 1.9, and the difference for HI is 0.6.

52 Explain, in terms of activity, why HCl(aq) reacts with Zn(s), but HCl(aq) does not react with Cu(s). [1]

HIGHLIGHT TO SEE THE ANSWER

Zinc is more active than hydrogen, but copper is less active than hydrogen.

On Table J, Zn is above H2, and Cu is below H2.

53 Copper has two naturally occurring isotopes. Information about the two isotopes is shown in the table below.

In the space in your answer booklet, show a numerical setup for calculating the atomic mass of copper. [1]

HIGHLIGHT TO SEE THE ANSWER

(62.93 u)(0.6917) + (64.93 u)(0.3083)

or

((62.93)(69.17) (64.93)(30.83)) /100%

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

Questions 51-53 Questions 54-55 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-74 Questions 75-77 Questions 78-80 Questions 81-83

 
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