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Measurement: Mass, Weight, Significant Figures, and Unit Conversion

Understand the difference between mass and weight, learn how to determine the number of significant figures in a measurement, practice rounding calculations, explore the rules for rounding in science, and study unit conversion.

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Measurement: Mass, Weight, Significant Figures, and Unit Conversion

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  1. Ch 2 Measurement

  2. Explain the differencebetween massand weight.

  3. Mass is the amount of matter.Weight is the force of gravity acting on matter.

  4. How many significant figures do the following measurements have? State the rule if the zeros are significant:a) 0.0250mb) 3.00 x 105m

  5. a) 0.0250m – 3, zeros that follow a nonzero number and a decimalb) 3.00 x 105m- 3, all numbers in the coefficient are sig. when the number is in sci. notation.

  6. How many significant figures do the following measurements have? State the rule if the zeros are significant:a) 9500gb) 9501g

  7. a) 9500g- 2 sig figsb) 9501g- 4 sig figs, zeros between two sig figs are significant

  8. Calculate, then round(1.50 x 1024m)(4.611 x 105m)= State the rule you used to round.

  9. 6.9165000 x 1029 m2 =6.92 x 1029m2least # of sig figs

  10. Calculate, then round 9.78m + 112.0m= State the rule you used.

  11. 121.78m= 121.8m Least # of decimal places

  12. Why do we need special rules to round mathematic answers in science but not math?

  13. To reflect the least precise instrument in the measurements.

  14. One base unit is the meter.Give an example of a modified base unit.

  15. Any base unit with ametric prefix.Ex. Millimeter,mm

  16. A measurement that is very close to the true value is

  17. Accurate

  18. What do the significant figures in a measurement indicate?

  19. The precision of the instrument, with one estimated digit.

  20. Explain the difference between a value with unlimited sig figs and a measurement.

  21. A value with unlimited sig figs is an exact, counted value. It is not a measurementA measurement has an estimation as the final digit.

  22. Give an example of a value with unlimited sig figs and then give an example of a measurement

  23. Exact-1100 students at a school Measurement -1100 seconds for a chemical reaction to occur

  24. A student made a series of four measurements in the lab. Determine whether the measurements are accurate, precise, both, or neither. The actual value of the measurement is 200.0mL.220.1mL, 180.3mL, 219.9mL, 180.2mL

  25. Accurate not precise

  26. Read the graduated cylinder

  27. 35.0mL

  28. Calculate, then round.1.4x1021 / 2.080x 1010

  29. 6.7 x 1010

  30. Convert 98.0mm to km.

  31. 98.0mm x 1km = 9.8 x 10-5 km 106mm

  32. Why is a density graph a straight line?

  33. Because the density of a substance is constant.

  34. 2.0g of a substance has a volume of 4.43cm3. What is it’s density?

  35. 0.45g/cm3

  36. Using your reference chart, write an equality that relates meters to micrometers.

  37. 1m = 106µm

  38. Give three examples of derived units.

  39. g/mL, cm3, m/s

  40. Give three examples of numbers with unlimited significant figures.

  41. 1000mm=1m23 students in a class$14.50

  42. Convert 2.2 x 10-3 to normal notation.

  43. 0.0022

  44. Calculate the mass of a substance that has a volume of 46.5mL and a density of 2.1g/mL.

  45. 98g

  46. Read the measurement on the centimeter ruler.

  47. 2.30cm

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