2. Chapter 1: An Introduction to Chemistry Turning on the Light © 2003 John Wiley and Sons Publishers Stone/Getty Images

5. http://www.youtube.com/watch?v=465RXSHMwsE

6. How does a battery works

7. Figure 1.3: An electric light bulb. © 2003 John Wiley and Sons Publishers Courtesy Ken Karp

8. Figure 1.5: The effect of sucrose and of sodium chloride on water’s ability to conduct an electric current. © 2003 John Wiley and Sons Publishers

9. How does Table Salt causes Conduction of Electricity?

10. Figure 1.1: The electrical circuit of a flashlight. © 2003 John Wiley and Sons Publishers

11. Figure 1.2: The electrical conductivity of tap water, sugar water, and salt water. © 2003 John Wiley and Sons Publishers

12. Electrolytes  Produce positive (+) and negative (-) ions when they dissolve in water.  In water conduct an electric current. Electrolytes

13. Strong electrolytes ionize 100% in solution. Equations for the dissociation of strong electrolytes show the formation of ions in aqueous (aq) solutions. H 2 O 100% ions NaCl(s) Na + (aq) + Cl - (aq) Strong Electrolytes

14.  Nonelectrolytes  Form only molecules in water.  Do not produce ions in water.  Do not conduct an electric current. Nonelectrolytes

15. The Scientific Method Observation and Experiments Patterns & Trends Formulate & Tests Hypothesis Theory Laws

16. An element is a substance that consist of the same atoms. 115 elements have been identified 83 elements occur naturally on Earth gold, aluminum, lead, oxygen, carbon Universe:H(91%);He(8.75%);Others(0.25%) Many elements have been created by scientists technetium, americium, seaborgium 1.4

17. Elements mercury, copper, and carbon. © 2003 John Wiley and Sons Publishers Courtesy Ken Karp

18. Figure 2.3: Distribution of the elements in the universe. © 2003 John Wiley and Sons Publishers

19. Figure 2.4: Distribution of the elements in the human body. © 2003 John Wiley and Sons Publishers

20. Figure 2.5: Composition of the human body. © 2003 John Wiley and Sons Publishers

21. Carbon, oxygen, and hydrogen are the most abundant elements in the human body. Elements in the Body http://www.youtube.com/watch?v=im8tmwTnnhM http://www.youtube.com/watch?v=im8tmwTnnhM

22. Names of Elements http://www.youtube.com/watch?v=zUDDi WtFtEMhttp://www.youtube.com/watch?v=zUDDi WtFtEM http://www.hobart.k12.in.us/ksms/Periodic Table/abc.htmhttp://www.hobart.k12.in.us/ksms/Periodic Table/abc.htm http://www.youtube.com/watch?v=Apr7Md bHGQohttp://www.youtube.com/watch?v=Apr7Md bHGQo

23. Select the correct symbol for each: A. Calcium 1) C2) Ca3) CA B. Sulfur 1) S2) Sl3) Su C. Iron 1) Ir2) FE3) Fe Learning Check

24. Select the correct symbol for each: A. Calcium 2) Ca B. Sulfur 1) S C. Iron 3) Fe Solution

25. Select the correct name for each symbol: A. N 1) neon 2) nitrogen 3) nickel B. P 1) potassium 2) phogiston3) phosphorus C. Ag 1) silver 2) agean3) gold Learning Check

26. Select the correct name for each: A. N 2) nitrogen B. P 3) phosphorus C. Ag 1) silver Solution

27. What Happens if we pass electricity through water? When was the last time you did Electrolysis?

28. What are Compounds? Substances composed of two or more elements in a fixed ratio. H 2 O( Water) NaCl (Table Salt), C 12 H 22 O 11 (sugar)

29. Compounds and Mixtures02

30. Sodium chloride, hydrogen peroxide, water, and sucrose are some of the more common compounds of our everyday world. © 2003 John Wiley and Sons Publishers Courtesy Ken Karp

31. © 2003 John Wiley and Sons Publishers What do you think would be the result of placing the wires into a solution made up of a mixture of equal parts of sucrose and sodium chloride? QUESTION

32. © 2003 John Wiley and Sons Publishers Would you expect to find many ions in pure water? Explain. QUESTION

33. © 2003 John Wiley and Sons Publishers How would you go about determining whether an aspirin tablet contains any electrolytes among its ingredients? QUESTION