August 2010 Chemistry Regents #68

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

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Base your answers to questions 67 through 69 on the information below.

Gasoline is a mixture composed primarily of hydrocarbons such as isooctane, which is also known as 2,2,4-trimethylpentane.

Gasoline is assigned a number called an octane rating. Gasoline with an octane rating of 87 performs the same as a mixture that consists of 87% isooctane and 13% heptane.

An alternative fuel, E-85, can be used in some automobiles. This fuel is a mixture of 85% ethanol and 15% gasoline.

 

68 In the space in your answer booklet, draw a structural formula for a molecule of 2,2,4-trimethylpentane. [1]

Back to 67 through 69

 

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

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 

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