1. Chapter 2-1Chemistry 120 Online LA Tech Chapter 2 Measurements In Chemistry

2. Chapter 2-2Chemistry 120 Online LA Tech © Richard Hamilton Smith/Corbis Outline Measurements in Chemistry → Measurements can never be exact; there is always some uncertainty.

3. Chapter 2-3Chemistry 120 Online LA Tech Metric system units are becoming increasingly evident on highway signs. Measurements in Chemistry cont’d

4. Chapter 2-4Chemistry 120 Online LA Tech  Table 2.1 Measurements in Chemistry cont’d

5. Chapter 2-5Chemistry 120 Online LA Tech → Fig. 2.2 Comparisons of the base metric system units of length, mass, and volume with common objects. Measurements in Chemistry cont’d E.R. Degginger

6. Chapter 2-6Chemistry 120 Online LA Tech Measurements in Chemistry cont’d ← Fig. 2.3 A cube 10 cm on a side is equal to 1 L; a cube 1 cm on a side is equal to 1 mL.

7. Chapter 2-7Chemistry 120 Online LA Tech Measurements in Chemistry cont’d The use of the concentration unit milligrams per deciliteris common in clinical laboratory reports dealing with the composition of human body fluids.

8. Chapter 2-8Chemistry 120 Online LA Tech The scale on a measuring device determines the magnitude of the uncertainty for the recorded measurement. Measurements in Chemistry cont’d

9. Chapter 2-9Chemistry 120 Online LA Tech Measurements in Chemistry cont’d

10. Chapter 2-10Chemistry 120 Online LA Tech The digital readout on an electronic calculator usually shows more digits than are needed. Measurements in Chemistry cont’d

11. Chapter 2-11Chemistry 120 Online LA Tech Measurements in Chemistry cont’d It is experimentally determined that 1 inch equals 2.54 cm, or 1 cm equals 0.394 inch

12. Chapter 2-12Chemistry 120 Online LA Tech Measurements in Chemistry cont’d ←Table 2.2

13. Chapter 2-13Chemistry 120 Online LA Tech Measurements in Chemistry cont’d 

14. Chapter 2-14Chemistry 120 Online LA Tech Measurements in Chemistry cont’d Both of these items have a mass of 23 grams, but they have very different volumes; therefore, their densities are different as well.

15. Chapter 2-15Chemistry 120 Online LA Tech Measurements in Chemistry cont’d → Table 2.3

16. Chapter 2-16Chemistry 120 Online LA Tech Measurements in Chemistry cont’d ← Fig. 2.9 The penny is less dense than the mercury it floats on.

17. Chapter 2-17Chemistry 120 Online LA Tech Measurements in Chemistry cont’d

18. Chapter 2-18Chemistry 120 Online LA Tech Measurements in Chemistry cont’d → Table 2.4

19. Chapter 2-19Chemistry 120 Online LA Tech Measurements in Chemistry cont’d → Fig 2.10 The relationships among the Celsius, Kelvin, and Fahrenheit temperature scales are determined by the degree sizes and the reference point values.