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 Those annoying Sig Figs Lots of zeroes What’s the Density, Kenneth? How wrong were you Secular Conversions

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

3. a. 4 b. 4 c. 3

4. How many sig figs would this measurement have?

5. 3, estimate one extra place

6. Round the following numbers to 2 sig figs: a. 5930 b. 0.02562 c. 0.3986

7. a. 5900 b. 0.026 c. 0.40

8. Calculate, using sig figs: 21 x 4.63 x 0.0891

9. 8.7

10. Calculate, using sig figs: 237.1 + 45.157 + 3.23

11. 285.5

12. Convert to scientific notation: 4510000 0.0008963

13. 4.51 x 10 6 8.963 x 10 -4

14. When adding or subtracting in scientific notation, what must be the same?

15. The superscript

16. What is 0.0672 x 10 4 in correct scientific notation?

17. 6.72 x 10 2

18. Calculate, and put into correct scientific notation and sig figs: (9.15 x 10 5 ) – (3.12 x 10 2 )

19. 9.15 x 10 5

20. Calculate, and put into correct scientific notation and sig figs: (8.96 x 10 -3 ) x (2.7 x 10 5 )

21. 2.4 x 10 3

22. What are the units for density?

23. g/cm 3 or g/mL

24. What is the order of density from least dense to most dense?

25. Oil, water, syrup

26. Using sig figs, what is the density of an object with a volume of 15.5 cm 3 and a mass of 3.21 g?

27. 0.207 g/cm 3

28. Using sig figs, calculate the volume for a substance that has a density of 2.9 g/mL and has a mass of 21.22 g.

29. 7.3 mL

30. A cube is 2.56 cm x 3.89 cm x 9.10 cm, and has a density of 12.5 g/cm 3. What is the mass of the cube? (use sig figs)

31. 1130 g

32. Draw a dart board that represents low accuracy and good precision.

34. Which of these sets is more accurate, if the accepted value is 20.0 g? Set 1Set 2 19.9 g19.8 g 20.1 g19.2 g 20.5 g 19.5 g20.3 g

35. Set 1; average = 20 g ( set 2 average = 19.95 g)

36. What is the difference between accuracy and precision?

37. Accuracy = close to accepted value Precision = measurements are all close together

38. Calculate the percent error if an object has an actual mass of 45.0 g and a student measures it to be 42.9 g.

39. 4.6% error

40. If the percent error during a lab is 10% and the accepted value is 50 g, what was the measured value? (there are 2 possible answers)

41. 55 g or 45 g

42. How many mL are in 1 L? How many g are in 1 kg?

43. 1000 mL 1000 g

44. How many km are in 2567 cm?

45. 0.02567 km

46. How many miles are in 12,560 cm? (1 inch = 2.54 cm)

47. 0.07804 miles

48. How many mL are in 4.6 pints? 1 cup = 0.240 L 1 pint = 2 cups

49. 2200 mL

50. How many meters/day is 3.89 mph? 1 inch = 2.54 cm 1 mile = 5280 ft

51. 1.50 x 10 5 m/day