1. nde-ewo (pronounced enday aywo) Turn in your Density Lab in the basket by the calculator caddy Get a calculator Take out a sheet of notebook paper Express the following to the correct number of significant figures a)334.54 g + 198 g b)34.1 grams / 1.1 mL c)2.11 x 10 3 joules /34 sec d)30 000 km/24.2600 hrs e)1.45 mL – 0.0003 mL Thursday, September 13, 2012

2. Check Yourself 1.533 g 2.31 g/mL 3.62 joules/sec 4.1000 km/hr 5.1.45 mL

3. Graphing Graphing is an important tool for expressing data so that it is easier to read and interpret Rules for graphing: --place the manipulated/independent variable (the one that was changed) on the x axis. --place the dependent/responding variable (the results of that change) on the y axis. (dry mix) DRY MIX y scale = largest y value – smallest y valuex scale = largest x value – smallest x value # of lines on the y axis# of lines on the x axis The graph should cover at least ¾ of the grid

4. Rules: Each person will have their own paper. Answer must be written correctly on your paper Use appropriate units (where it applies)

5. Question #1 Roll the die then round to the correct number of significant figures in the following: a) 0.58742005 b) 30 024 589

6. Question #2 Roll the die then round to the correct number of significant figures in the following: : a) 900007.0 b) 0.20470810

7. Question #3 Calculate. Express your answer in the proper # of significant figures. a) 1.44 m X 2.467 m = b) 7082 ÷ 42 =

8. Question # 4 Calculate. Express your answer in the proper # of significant figures or decimal places. a) 7182 ÷ 52 = b) 55.46 g – 36.2 g =

9. Question # 5 Express in standard scientific notation. a)0.00382 b)456 3000

10. Question # 6 Express in normal notation. a)4.53 X 10 5 b)2.1 X 10 -4

11. Question #7 Draw the metric conversion grid. ( Hint…King Henry….)

12. Question # 8 Calculate density. Show all steps and units. mass 537 g, volume 1002 mL

13. Question #9 Calculate mass. Show all steps and units. density 7g/mL, volume 222 mL

14. Question # 10 Calculate volume. Show all steps and units. density 3 g/mL, mass 2100 g

15. Question # 11 What is the difference between accuracy and precision?

16. Question #12 Tell if the following data is accurate, precise, both or neither. A nail has a length of 3.04 cm. Measurements recorded were: 2.01, 2.02, 2.01, 2.03

17. Question #13 Give the appropriate unit to measure the following: a)The weight of a minivan b) The volume of gas in a car’s tank

18. Question #14 Give the appropriate unit to measure the following: a)The length of a bar of soap b)The volume of a tube of toothpaste

19. Question # 15 Answer the following questions: a)How many decigrams are in a hectogram? b)How many centimeters are in a kilometer?

20. Question # 16 The lines in the picture just touch the rim of the penny. Record the diameter of the penny in centimeters, recording the correct number of significant figures.

21. Answers

22. Question # 1 You rolled a… Your answer should be 10.6 20.59 30.587 40.5874 50.58742 60.587420 a) b) You rolled a… Your answer should be 130 000 000 23.0 x 10 7 33.00 x 10 7 430 020 000 530 024 000 630 024 600

23. Question # 2 You rolled a… Your answer should be 1900000 29.0 x 10 5 39.00 x 10 5 49.000 x 10 5 59.0000 x 10 5 6900007 a) b) You rolled a… Your answer should be 130 000 000 23.0 x 10 7 33.00 x 10 7 430 020 000 530 024 000 630 024 600

24. Question #3 a)3.55 m b)170

25. Question #4 a)140 b)19.3

26. Question #5 a)3.82 x 10 -3 b)4.563 x 10 6

27. Question #6 a)45300 b)0.00021

28. Question #7 k hda BASEdcm kilohectodekadecicentimilli

29. Question #8 D = m/V = 537 g/1002 mL= 0.536 g/mL

30. Question #9 M = DV = (7 g/mL)(222 mL) = 2000 g

31. Question #10 V = m/D = 2100 g/ (3 g/mL) = 700 mL

32. Question #11 Accuracy: how close values are to the known (true) value Precision: how close values are together

33. Question #12 Precise

34. Question #13 a)kg b)L

35. Question #14 a)cm b)mL

36. Question #15 a)1000 or 10 3 b)100 000 or 10 5

37. Question #16 1.92 cm (make sure your answer has a 100ths place value; it doesn’t have to be a 2)