1. Chapter 1(b) Chemical Foundations (cont’d)

2. Figure 1.10: The results of several dart throws show the difference between precise and accurate.

3. Caffeine, which occurs in such items as tea, coffee, and cola nuts, is a respiratory and cardiac stimulant.

4. Copyright © Houghton Mifflin Company. All rights reserved.1b–4 Rules for Counting Significant Figures.

5. Copyright © Houghton Mifflin Company. All rights reserved.1b–5

6. Copyright © Houghton Mifflin Company. All rights reserved.1b–6 Figure 1.11: The three major temperature scales.

7. Copyright © Houghton Mifflin Company. All rights reserved.1b–7 Figure 1.12: Normal body temperature on the Fahrenheit, Celsius, and Kelvin scales.

8. Liquid nitrogen is so cold that water condenses out of the surrounding air, forming a cloud as the nitrogen is poured.

9. Copyright © Houghton Mifflin Company. All rights reserved.1b–9

10. Copyright © Houghton Mifflin Company. All rights reserved.1b–10 Figure 1.13: The three states of water (where red spheres represent oxygen atoms and blue spheres represent hydrogen atoms).

11. Copyright © Houghton Mifflin Company. All rights reserved.1b–11 Figure 1.14: Simple laboratory distillation apparatus.

12. Figure 1.15a: Paper chromatography of ink. (a) A line of the mixture to be separated is placed at one end of a sheet of porous paper.

13. Figure 1.15b: Paper chromatography of ink. (b) The paper acts as a wick to draw up the liquid.

14. Figure 1.15c: Paper chromatography of ink. (c) The component with the weakest attraction for the paper travels faster than the components that cling to the paper.

15. The element mercury (top left) combines with the element iodine (top right) to form the compound mercuric iodide (bottom). This is an example of a chemical change.

16. Copyright © Houghton Mifflin Company. All rights reserved.1b–16 Figure 1.16: The organization of matter.