Making Measurements by DVfdoh

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									Making Measurements

  Measuring Madness Handout
         Ms. Lockhart
          Chemistry
           GPS Standard
• SCSh4   • Students will use tools and instruments
            for observing, measuring, and
            manipulating scientific equipment and
            materials.
             – a. Develop and use systematic procedures for
               recording and organizing information.
             – b. Use technology to produce tables and
               graphs.
             – c. Use technology to develop, test, and revise
               experimental or mathematical models.
                    Distance
• Distance              • The measurement of
                          change from one position
                          to a new position.

• SI Unit (metric       • Base Unit: meter
  system)               • Prefixes: centimeters,
                          kilometers.

• Instruments
                        • Ruler, meter stick
                Mass
• Mass            • The amount of matter an
                    object contains.

• SI Unit         • Base Unit: Grams
                  • Prefixes: centigrams,
                    kilograms

                  • Triple Beam Balance and
• Instruments       Analytical Balance
                Volume
• Volume           • The amount of space
                     an object takes up.

                   • Base Unit: Liters
• SI Unit
                   • Prefixes: centiliters,
                     kiloliters

• Instruments      • Beaker, graduated
                     cylinder, ruler.
            Measuring Volume
1. Using Instruments      • Pour liquid in container.
                            Measure.

                          • Pour liquid in container.
2.   Using Displacement     Measure.
                          • Add weird shaped object.
                            Measure.
                          • Subtract the difference.

3.   Using Distance       • Measure the length, width and
                            height of an object.
                          • Multiply all numbers together.
                              – LxWxH
                Temperature
• Temperature         • The average kinetic
                        energy of a substance.

                      • Base Unit: Kelvins
• SI Unit               (°K).
                      • Other unit: Celsius
                        (°C).


• Instruments         • Thermometer.
                  Percent Error
• Percent Error      • The measure of the accuracy of
                       your results.

• How do you         • Subtract the predicted results
  find percent         (theoretical) from the lab results
  error?               (actual/experimental)
                     • Divide by the theoretical results
                     • Multiply by 100
                        – The unit is ‘%’
                        – Warning: numbers can be positive or
                          negative.
                        Study Guide
•   The four units of measurement (Section 2.1)
•   The definition of mass, distance and volume (Section 2.1)
•   The instruments used to measure (Lab Information)
•   The accuracy of an instrument (Section 2.3)
•   How to find volume of objects with odd shapes (Lab Information)
•   Percent error (Section 2.3)
•   How to convert (change) units from one unit to the next (Section 2.2)
•   Extra Practice for Quiz: p. 45(19) and p. 49 (32-33)

								
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