1. Chapter 2 Measurements 2.1 Units of Measurement
Learning Goal Write the names and abbreviations for the metric or SI units used in measurements of length, volume, mass, temperature, and time.
© 2014 Pearson Education, Inc.

2. Identifying Place Values (1.4A)
Chapter 2 Readiness
Key Math Skills
Identifying Place Values (1.4A)
© 2014 Pearson Education, Inc.

3. The International System of Units (SI)
Chemists use the metric system and the International System of Units (SI) for measurement when they
measure quantities
do experiments
solve problems

4. Units of Measurement and Their Abbreviations

5. Length
Length is measured in
units of meters (m) in both the metric and SI systems
units of centimeters (cm) by chemists

6. Length
Useful relationships between units of length include:
1 m = yd
1 m = in.
1 m = 100 cm
2.54 cm = 1 in.

7. Volume
Volume, the space occupied by a substance,
is measured using units of m3 in the SI system
is commonly measured in liters (L) and milliliters (mL) by chemists

8. Volume
Useful relationships between units of volume include:
1 m3 = 1000 L
1 L = 1000 mL
1 mL = 1 cm3
1 L = qt
946.3 mL = 1 qt

9. Mass
The mass of an object, a measure of the quantity of material it contains,
is measured on an electronic balance
has the SI unit of kilogram (kg)
is often measured by chemists in grams (g)

10. Mass
Useful relationships between units of mass include:
1 kg = 1000 g
1 kg = lb
453.6 g = 1 lb

11. Temperature
Temperature, a measure of how hot or cold an object feels,
is measured on the Celsius (ºC) scale
is measured on the Kelvin (K) scale in the SI system
is 18 ºC or 64 ºF on this thermometer

12. Time
Time is based on an atomic clock and is measured in units of seconds (s) in both the metric and SI systems.

13. Learning Check
For each of the following, indicate whether the unit describes
(1) length, (2) mass, or (3) volume
A. A bag of onions has a mass of 2.6 kg.
B. A person is 2.0 m tall.
C. A medication contains 0.50 g of aspirin.
D. A bottle contains 1.5 L of water.

14. Solution
For each of the following, indicate whether the unit describes
(1) length, (2) mass, or (3) volume
A. A bag of onions has a mass of 2.6 kg (2)
B. A person is 2.0 m tall (1)
C. A medication contains 0.50 g of aspirin (2)
D. A bottle contains 1.5 L of water (3)

15. Learning Check
Identify the measurement that has an SI unit.
A. John’s height is _____.
(1) 1.5 yd (2) 6 ft (3) 2.1 m
B. The mass of a lemon is _____.
(1) 12 oz (2) kg (3) 0.6 lb
C. The temperature is _____.
(1) 85 ºC (2) 255 K (3) 45 ºF

16. Solution
Identify the measurement that has an SI unit.
A. John’s height is______. (3) 2.1 m
B. The mass of a lemon is _____. (2) kg
C. The temperature is _____. (2) 255 K