Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 1  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading

spacer1.1
Metric
spacerSystem
spacerSI System
spacerBritish System

spacer1.2 Temperature
spacerMeasure-
spacerments

spacer1.3 Scientific
spacerNotation

spacer1.4 Dimensional
spacerAnalysis

spacer1.5 Precision,
spacerAccuracy,
spacerUncertainty

spacerLimitation of the Measuring Instrument
spacerAnalysis of the Limitation of a Ruler
spacerAnalysis of the Limitation of another Ruler
spacer1.6 Significant
spacerFigures

spacerThe Magnitude and Reliability of the Measurement
spacerFive Rules for Determining the number of Significant Figures in a Measurement

spacer1.7 Calculations
spacerInvolving
spacerSignificant
spacerFigures
spacerRules for Rounding off Numbers
spacerRules for Addition  and Subtraction

spacerRules for Multiplication and Division

spacer1.8 Density
spacerDensity and Temperature
spacer1.9 Specific
spacerGravity
spacerspacerProblems
spacer1 | 2 | 3
   

Unit #1 Measurements

Significant Figures

1. Determine the number of significant figures in the following measurements:

  • (a) 30.240 cm have?
    3 4 5

  • (b) 0.00545 g have?
    3 4 5

  • (c) 1.00040
    3 5 6

2. Perform the arithmetic operation and round off the answers to the correct number of significant figures:

  • (a) (0.0022 g)/(3.45 mL)

    6.377 x 10-4 g/mL
    6.4 x 10-4 g/mL
    6.38 x 10-4 g/mL

  • (b) 84.35 g - 0.02345 g

    8.4 x 101 g
    84.3266 g
    84.33 g

  • (c) 65.5 g / (54.45 cm x 65.45 cm x 65.0006 cm)

    0.000283 g/cc
    0.00028 g/cc
    0.00 g/cc

3. Express the following in scientific notation to three significant figures:

  • (a) 670

    67.0 x 101
    6.7 x 102 g/mL
    6.70 x 102 g/mL

  • (b) 0.000006778

    6.77 x 10-6
    0.678 x 10-5
    6.78 x 10-6

  • (c) 4.35 x 105 + 3.432 x 104

    4.69 x 105
    7.78 x 105
    3.86 x 104

 

 

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British Columbia Institute of Technology
Chemistry Department - 3700 Willingdon Avenue
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