June 2009 Chemistry Regents #54-57

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Questions

Base your answers to questions 54 through 57 on the information below. 54 On the grid in your answer booklet, mark an appropriate scale on the axis labeled “Boiling Point (K).” [1]   55 On the same grid, plot the data from the data table. Circle and connect the points. [1] LINK TO SEE THE ANSWERS 54 and 55 56 Based on the data in the table, state the relationship between the boiling point at 1 atmosphere and molar mass for these four substances. [1] HIGHLIGHT TO SEE THE ANSWER As molar mass increases, boiling point at 1 atm increases. the smaller the molar mass, the lower the boiling point 57 State, in terms of intermolecular forces, why the boiling point of propane at 1 atmosphere is lower than the boiling point of butane at 1 atmosphere. [1] HIGHLIGHT TO SEE THE ANSWER The boiling point of propane at 1 atm is lower than the boiling point of butane at 1 atm because propane has weaker intermolecular forces than butane. Butane has stronger intermolecular forces. Next Questions

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