January 2010 Chemistry Regents #66-68

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Base your answers to questions 66 through 68 on the information below.

At STP, iodine, I2, is a crystal, and fluorine, F2, is a gas. Iodine is soluble in ethanol, forming a tincture of iodine. A typical tincture of iodine is 2% iodine by mass.

66 Compare the strength of the intermolecular forces in a sample of I2 at STP to the strength of the intermolecular forces in a sample of F2 at STP. [1]

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weaker intermolecular forces in F2

(IMF's are stronger in solids than gases)

67 In the space in your answer booklet, draw a Lewis electron-dot diagram for a molecule of I2. [1]

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68 Determine the total mass of I2 in 25 grams of this typical tincture of iodine. [1]

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0.5g

SET Up not required

2%=

X x100%
25g

On to Questions 69-71

 

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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