Chapter 1
1.24 a. A pure gold chain The chain is only made of gold; therefore, it is a pure substance.
b. Liquid eye drops This is a solution
... [Show More] because it contains saline (water and sodium
chloride) as well as other substances.
e. Cooking oil It can be a solution or a pure substance depending on the oil.
Some oils only contain a single compound (pure substances);
however, most oils are a mixture of several different compounds
(solution).
g. Window glass It is a solution because it contains a mixture of silicon dioxide and
other components like iron.
MEASUREMENT UNITS (SECTION 1.5)
1.26 Modern society is complex and interdependent. Accomplishing projects like building a
bridge, constructing a house, or machining an engine may require many different people to
participate. Some people design the project, others supply the necessary materials, and yet
another group does the construction. In order for the project to be successful, all of these
people need a common language of measurement. Measurement is also important for giving
directions, keeping track of the time people work, and keeping indoor environments at a
comfortable temperature and pressure.
1.28 In cooking, measuring cups (units = cups) and measuring spoons (units = teaspoon,
Tablespoon) are used for volume measurements. In sewing and woodworking, a tape
measure (units = yards, feet, inches) is used for length measurements. In machining, dial
calipers (units = inches or centimeters) are used for length measurements. In athletic events, a
timer or stopwatch (units = hours, minutes, seconds) are used for time measurements. In
driving, a speedometer (units = miles per hour), odometer (units = miles), and a tachometer
(rotations per minute) are used for speed, distance, and rotation rate measurements,
respectively. (Many other examples are possible.)
THE METRIC SYSTEM (SECTION 1.6)
1.30 The metric units are (a) degrees Celsius, (b) liters, (d) milligrams, and (f) seconds. The English
units are (c) feet and (e) quarts.
1.32 Meters are a metric unit that could replace the English unit feet in the measurement of the
ceiling height. Liters are a metric unit that could replace the English unit quarts in the
measurement of the volume of a cooking pot.
1.34 a. 1.00 L 6
1 L
10 L
1.00 106 L
b. 75 kilowatts
1000watts
1 kilowatt
7.5 104 watts
c. 15 megahertz
106 hertz
1 megahertz
1.5 107 hertz
d. 200 picometers
10 12 meters
1 picometer
2.00 1010 meters
[Show Less]