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Homework answers / question archive / Oshkosh North High School SCIENCE E3202 UNIT 2 ACTIVITY The Case of the Drunk Driver Its late at night, and the city’s bars have just closed

Oshkosh North High School SCIENCE E3202 UNIT 2 ACTIVITY The Case of the Drunk Driver Its late at night, and the city’s bars have just closed

Chemistry

Oshkosh North High School

SCIENCE E3202

UNIT 2 ACTIVITY

The Case of the Drunk Driver

Its late at night, and the city’s bars have just closed. You’re a police officer patrolling your regular area when you see a car weaving erratically across the road. You follow the car into a residential neighborhood. The driver sees you and pulls over. Shining your flashlight into the car, you notice that a driver is a man in his thirties, about 160 pounds.

As he hands over his license and registration, the man slurs his speech. He is uncoordinated and seems to have trouble getting his license out. You ask him if he’s been drinking. He admits that he had two beers at a nearby bar. You decide to give the driver a breathalyzer test. This test shows the man’s current blood alcohol content (BAC) as 0.12%, which is above the DUI limit of 0.08%. You arrest him for DUI.

Calculating BAC

BAC can be estimated in the following way:

Use this formula and your math skills to answer the questions below.

1)Regular 12-oz beer is about 5% alcohol. This works out to about 14.03 grams of alcohol per beer. If the driver drank two beers, how many grams of alcohol did he consume?

  1. The driver weighs about 160 lbs. What is his body weight in kg? What is his body volume in mL? (1 lb = 0.45 kg) (1 kg = 1000 mL)
  2. For most males, 68 percent of the body is water. What is the volume of water in the driver’s body in mL?
  3. Use the above information to calculate BAC. 0.0568
  4. The measured BAC was 0.12%. Was the driver telling the truth about how much he drank? Calculate the difference between the two BAC percentages.
  5. If the driver had really consumed only two beers, would he have been arrested for DUI? Explain.

 

TABLE 1 Signs of impairment based on BAC Level

  1. Based on this table and the description in Part I, did the driver’s behavior match his measured BAC of 0.12 percent? Explain. (1-2 sentences)
  2. If the driver had consumed only two beers as he claimed, what kind of behavior might he show? (1-2 sentences)
  3. The legal limit for driving is 0.08 percent BAC. Can a driver show the effects of impairment below this level? What effects might be present? Do you think it is safe to drive with these effects? Explain your answer. (2-3 sentences)

 

 

 

 

 

 

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