Chapter 01 – Chemistry: The Study of Change
91.
Give the correct number of significant figures and units to the problem below. 5.46 m3/ 2.01 m2 =
92.
Give the correct number of significant figures and units to the problem below. 5.67 m/ 2.04 m2 =
93.
Give the correct number of significant figures and units to the problem below. (3.45 m + 2.78 m)/ 565 s =
94.
Give the correct number of significant figures and units to the problem below. (5.62 cm – 0.45 cm)/ 342 s =
Chapter 01 – Chemistry: The Study of Change
95.
A long course triathlon entails a 2.0 mile swim, an 85.5 mile bike ride and a 15.0 mile run. What is the total distance in
kilometers for the triathlon?
96.
A cyclist averages 18.5 miles per hour. How many minutes will it take for him to complete a 125 kilometer race?
Chapter 01 – Chemistry: The Study of Change
97.
A runner averages 8 minutes and 25 seconds per mile. What is her average velocity in miles per hour?
98.
Iron has a density of 7.87 g/cm3. What mass of iron would be required to cover a football playing surface of 120 yds 60 yds
to a depth of 1.0 mm? (1 inch = 2.54 cm; 1 lb = 453.6 g)
Chapter 01 – Chemistry: The Study of Change
99.
Americans combined drive about 4.0109 miles per day and their vehicles get an average of 20 miles per gallon of fuel used.
For each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced. How many kilograms of CO2 are emitted into the
atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.
100.
How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100.00 worth of
gold? The density of the ore is 8.0 g/cm3 and the price of gold is $818 per troy ounce. (14.6 troy oz = 1.0 ordinary pound,
called an avoirdupois pound; 1 lb = 454 g)
Chapter 01 – Chemistry: The Study of Change
101.
Radio waves travel at the speed of light, which is 3.00 108 m/s. How many minutes does it take for a radio message to reach
Earth from Saturn if Saturn is 7.9 108 km from Earth?
102.
Radio waves travel at the speed of light, which is 3.00 108 m/s. How many kilometers will radio messages travel in exactly
one year?
Chapter 01 – Chemistry: The Study of Change
103.
The city of Los Angeles is now approximately 2400 miles south of Alaska. It is moving slowly northward as the San Andreas
fault slides along. If Los Angeles is to arrive near Anchorage, Alaska, in 76 million years, at what average rate will it have to
move in mm per month?
104.
The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How
many grams of calcium carbonate are needed to provide the RDA of calcium?
Chapter 01 – Chemistry: The Study of Change
105.
A spherical vessel (diameter = 2.00 cm) when empty has a mass of 2.00 g. What is the greatest volume of water that can be
placed in the vessel and still have the vessel float at the surface of water? (Given: density of water = 1.00 g/cm3)
106.
A spherical vessel (diameter = 5.00 cm) when empty has a mass of 12.00 g. What is the greatest volume of water that can be
placed in the vessel and still have the vessel float at the surface of benzene? (Given: density of water = 1.00 g/cm3; density of
benzene = 0.879 g/cm3)
Chapter 01 – Chemistry: The Study of Change
107. One of the common intravenous fluids, called physiological saline, is a homogeneous
mixture of NaCl in water. In this mixture, 0.89% of the mass is contributed by the NaCl. What
mass of NaCl is found in 450. mL of physiological saline? (Given: density of physiological
saline = 1.005 g/cm3)
108. A special flask used in the determination of densities, called a pycnometer, has a mass of
16.3179 g when empty, and it has a mass of 48.0250 g when filled with water at 20.0C.
When this same pycnometer is filled with ethyl alcohol at 20.0C, it is found to have a mass
of 41.3934 g. Find the density of ethyl alcohol at 20.0C. (Given: at 20.0C, the density of
water is 0.9982 g/mL)
Chapter 01 – Chemistry: The Study of Change
109.
A particular flask has a mass of 17.4916 g when empty. When filled with ordinary water at 20.0C (density = 0.9982 g/mL),
the mass of the flask is now 43.9616 g. The density of so-called “heavy water” at 20.0C is 1.1053 g/mL. What will the mass
of the flask be when filled with heavy water at 20.0C?
110. Which of the following is the correct definition of matter?
Chapter 01 – Chemistry: The Study of Change
111. Which of the following is an accurate definition of a pure substance?
112. Of the following which is NOT a pure substance?
Chapter 01 – Chemistry: The Study of Change
113. Which of the following is true of a mixture?
114. Of the following which is NOT an example of a mixture?
Chapter 01 – Chemistry: The Study of Change
115. Which of the following is true of an element?
116. Which of the following is true of a compound?
Chapter 01 – Chemistry: The Study of Change
117.
Select True or False: Ice cream is a pure substance.
118.
Select True or False: Bread is a mixture.
119.
Select True or False: Seven-Up® is a pure substance.
Chapter 01 – Chemistry: The Study of Change
120.
Select True or False: Air is a pure substance.
121.
Select True or False: Table salt is an element.
122.
Select True or False: Iced tea is a mixture.
Chapter 01 – Chemistry: The Study of Change
123.
Select True or False: Oxygen is an element.
124.
Select True or False: Brewed coffee is a pure substance.
125.
Select True or False: Sugar to put in coffee is a compound.
Chapter 01 – Chemistry: The Study of Change
126.
Select True or False: Milk is a pure substance.
127.
Select True or False: A pure yellow crystalline substance, when heated in a vacuum, releases a greenish gas and a red
powder. Is the original yellow crystalline substance a compound?
Chapter 01 – Chemistry: The Study of Change
128.
What are the three states of matter?
129. What are the common names for the solid, liquid, and gaseous states of water?