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 are not exact → 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. Metric System

4. Chapter 2-4Chemistry 120 Online LA Tech  Table 2.1 Metric Prefixes

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. Metric System Base Units E.R. Degginger

6. Chapter 2-6Chemistry 120 Online LA Tech Volume Unites (cm 3, L and mL) ← 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 Solution Concentration Units 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. Uncertainty of Measurements

9. Chapter 2-9Chemistry 120 Online LA Tech Significant Figures in Measurements

10. Chapter 2-10Chemistry 120 Online LA Tech The digital readout on an electronic calculator usually shows more digits than are needed. Rounding off from Calculator Answer

11. Chapter 2-11Chemistry 120 Online LA Tech Unit Conversions 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 Unit Conversion Factors ←Table 2.2

13. Chapter 2-13Chemistry 120 Online LA Tech Common Conversion Factors 

14. Chapter 2-14Chemistry 120 Online LA Tech Densities and Masses 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 Properties of Gases, Liquids and Solids → Table 2.3

16. Chapter 2-16Chemistry 120 Online LA Tech Why the Coin floats on Mercury? ← Fig. 2.9 The penny is less dense than the mercury it floats on.

17. Chapter 2-17Chemistry 120 Online LA Tech Measurements of Body Density

18. Chapter 2-18Chemistry 120 Online LA Tech Specific Heat of Substances → Table 2.4

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