Measurement
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Measurement

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Measurement Presentation Transcript

  • 1.
    • When you come in, please get out your lab materials from yesterday. Do what you need to do to complete the lab (weigh sand) and complete the calculations. I will be collecting it in fifteen to twenty minutes. Finish up! If you are done, study for the quiz today.
  • 2. Section 3.1-3.3
  • 3.
    • A measurement contains two things:
    • Number
    • Unit
    • The unit typically used in the sciences are those of the International System of Units.
    Quantity SI base Unit Symbol Length Meter m Mass Kilogram kg Temp Kelvin K Time Second s Amount of substance Mole mol
  • 4.
    • Some number used in science are just too big to write out…
    • For example:
    • There are a 602,000,000,000,000,000,000 hydrogen atoms in a gram of hydrogen.
    • An atom of Au has a mass of 0.000000000000000000000327 gram
    • So what do we do?
  • 5.
    • A number in scientific notation is a product of two numbers:
    • A coefficient (1≤X<10)
    • 10 raised to a power
    • Ex: 645,000
    • Scientific notation: 6.45 X 10 5
    • This is the same as saying 6.45 X 10 X 10 X 10 X 10 X 10
  • 6.
    • Ex: 0.000045
    • Scientific Notation: 4.5 X 10 -5
    • This is the same as saying 4.5 ÷ 10 ÷ 10 ÷ 10 ÷ 10 ÷ 10
  • 7.
    • Ex: 7.054 X 10 6
    • Ex: 4.7 X 10 -7
  • 8.
    • Please complete 1-43 ODD on your own
  • 9.
    • The unit typically used in the sciences are those of the International System of Units.
    Quantity SI base Unit Symbol Length Meter m Mass Kilogram kg Temp Kelvin K Time Second s Amount of substance Mole mol
  • 10.
    • 1. How many years are in a CENTury?
    • How many CENTimeters are in a meter?
      • A centimeter is 1/100 th of a meter
    • How many grams are in a KILOgram?
    • Take a look at the handout…
  • 11.
    • Making the connection…
    • We know that there are 100cm in 1 meter. But how do I determine how many centimeters are in an inch?
  • 12.
    • Accuracy: How does your value compare to a known (or accepted value)?
    • Precision: How does one of your values compare to all of them? If you take multiple measurements, are they all close in value?
    • Tips for the lab: It does not necessarily matter where you measure from exactly. Just be sure that the length you measure in inches is exactly that same length you measure in centimeters .
  • 13.
    • HW due Monday: pg 58-59 (#36 37, 38, 39, 44, 45, 46, 48, 49a, 52, 54, 55, 56, 67, 69, 70)
    • Tonight: Suggested Readings (3.1-3.3)
    • Tomorrow: Sig Figs (3.1)
    • Thursday: Dimensional Analysis (3.3)
    • Check out the Helpful websites – There is a good site describing physical and chemical properties and changes.