Chemistry 151 at Miramar College

Chapter 2 - More Practice Problems

1. My back yard is a 50.-foot by 100.-foot rectangle. According to local sources, we get about 9.5 inches of rain per year in San Diego. How many gallons of rain would fall on my yard in a year? Answer

2. What is the mass, in kilograms, of a 10.0-liter sample of magnesium? The density of magnesium is 108.57 pounds per cubic foot. Answer

3. Translate the Tollhouse cookie recipe into metric units. (Don't worry too much about sig figs on this one. But you may have to look up a couple of new conversion factors.)

   3/4 cup brown sugar (convert to milliliters)
   3/4 cup sugar (convert to milliliters)
   1 teaspoon vanilla (convert to milliliters)
   1 cup butter or margarine (convert to milliliters)
   2 eggs (convert to grams*)
   2 cups flour (convert to milliliters)
   1 teaspoon baking soda (convert to milliliters)
   12 ounces of chocolate chips (convert to grams)
   * - Assume each egg weighs 3.0 ounces Answer

4. You've just used 19.4 gallons of high-gloss red enamel to paint your old BMW. If the VOC (volatile organic compound) content of the enamel is 483 grams of VOC per liter of paint, how many tons of VOC did you just emit into the atmosphere? Answer

5. A UH-60A Black Hawk helicopter has two General Electric engines, each of which emits 12.75 pounds of NOx (oxides of nitrogen) per hour. If a Black Hawk flies a 35-minute mission through San Diego, how many tons of NOx would it emit into the atmosphere? Answer

6. What was the population density, in persons per acre, of the Republic of India in 1991? According to my World Almanac, India had 866 million people and a land area of 1,266,595 square miles in 1991. What is the density in persons per square foot? Answer

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