1. 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt 20 pt 30 pt 40 pt 50 pt 10 pt Math+ Chemistry = FUN Small, but powerful Isn’t it ionic – or covalent That table thingy Don’t overreact

2. How many sig figs are in the following numbers: a. 0.07850 b. 25010 c. 700

3. a. 4 b. 4 c. 1

4. In sig figs, what is 43.7  11.88 ?

5. 3.70

6. Write the following numbers in correct scientific notation: 0.00008768 90,250,000 0.126

7. 8.768 x 10 -5 9.025 x 10 7 1.26 x 10 -1

8. How many grams would a piece of lead weigh if it was 8.75 cm 3 ? (density Pb = 11.34 g/cm 3 )

9. 99.2 g

10. How many km are in 2567 cm?

11. 0.02567 km

12. Determine protons, electrons and neutrons in an atom of sodium - 23

13. Protons = 11 electrons = 11 neutrons = 12

14. What elements have the following e- configurations: [Ar]4s 2 3d 7 [Kr]5s 2 4d 10 5p 4

15. Cobalt Tellurium

16. What are the sublevels, and how many electrons can each one hold?

17. S = 2 p = 6 d = 10 f = 14

18. Write the orbital diagram for P

20. Give 3 examples of electromagnetic radiation

21. Microwaves, radio, infrared, visible, UV, X-rays, Gamma (discuss frequency, wavelength, energy relationships)

22. What is the difference between ionic and covalent in terms of electrons?

23. Ionic = transferred electrons Covalent = shared electrons

24. Name the following compounds: MgCl 2 N 2 O 4 Na 2 CO 3

25. Magnesium chloride, dinitrogen tetroxide, sodium carbonate

26. Write out the formulas for the following compounds: aluminum sulfate sodium sulfide

27. Al 2 (SO 4 ) 3 Na 2 S

28. Draw the Lewis structure for NO 3 1-

29. O - N – O

30. Name the acids H 2 SO 4 and HF

31. Sulfuric acid Hydrofluoric acid

32. How many valence electrons do the following elements have: Na P Br Al

33. Na = 1 P = 5 Br = 7 Al = 3

34. What are the names of the following groups: Group 1A, 2A, 7A

35. Alkali metals, alkaline earth metals, halogens

36. Which atom has a larger radius – magnesium or sulfur?

37. Magnesium (radius decreases across the periods)

38. Name another element that will behave similarly to fluorine.

39. Chlorine

40. Which is more electronegative: N or Be? F or Br?

41. N and F

42. A positively charged Ion is called a……

43. cation

44. Identify the following as physical or chemical: a. burning b. melting c. rusting

45. Chemical physical chemical

46. What is Hund’s rule?

47. All electrons must occupy the same energy level with a single electron before adding additional electrons.

48. What is the independent variable?

49. The variable that changes in an experiment.

50. Use dimensional analysis to convert 74 inches to yards.

51. 2.05 yd