Chemistry Reference
In-Depth Information
Lesson 2-1 Review
1.
[meter]—As shown in Figure 2-1c, the meter measures length.
2.
[electric current]—Again, see Figure 2-1c.
3.
[Kelvin]—Although you will often measure temperature in Celsius degrees
in your laboratory, Kelvin is the scale accepted by the International System
of Measurements.
4.
[100]—The prefix “centi-” means hundredth.
5.
[100 000]—Each kilogram contains 1000 grams, and each gram is made up
of 100 centigrams.
1000 g
1 kg
100 cg
1 g
1 kg ×
×
= 100000 cg
6.
[345]—Each meter is made up of 100 centimeters.
3.45 m ×
100 cm
1 m
= 345 cm
7.
[0.764]—a decimeter is 1/10th of a meter, and a meter is 1/1000th of
kilometer.
1 m
10 dm
1 km
1000 m
7640 dm ×
×
= 0.764 km
8. [D. joule]—The joule is an SI-derived unit, made from a combination of
base units.
9. [D. joule]—As shown in Figure 2-1f, the joule is a unit of energy.
10. [A. speed]—To measure the rate of motion, you need a unit of length and a
unit of time.
Lesson 2-2 Review
1.
[volume]—Although often confused with mass, volume is a measure of how
much space an object occupies.
2.
[mass]—Massive objects needn't be very large; they must contain a lot of
matter.
3.
[balance]
4.
[1000]—Conversion factors for volume can be found on page 47
3.43 dm
3
×
1000 cm
3
1 dm
3
5.
[3430 cm
3
]—
= 3430 cm
3
1 L
1000 ml
6.
[0.563 L]—
563 ml ×
= 0.563 L
4.3 L ×
1000 cm
3
1 L
7.
[4300]—
= 4300 cm
3
8.
[graduated]
