Measurements and Calculation

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Author:
michaelirby98
ID:
261840
Filename:
Measurements and Calculation
Updated:
2014-02-16 16:30:13
Tags:
Chemistry
Folders:
Chemistry
Description:
Chap 2
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  1. Quantitative observation
    • Measurement 
    • Comparison based on an accepted scale
    • Contain a number AND a unit
  2. Scientific Notation
    • Technique used to express very large or very small numbers
    • Based on powers of 10

    ex 3.6 x10e-4
  3. Kilo (symbol, value, SN)
    • k
    • 1,000
    • 10e3
  4. Centi (Symbols, value, SN)
    • c
    • 0.01
    • 10e-2
  5. Milli (Symbol, value, SN)
    • m
    • 0.001
    • 10e-3
  6. When do you use 10e0?
    When the number in question already has only 1 digit left to the decimal 

    7.31 -> 7.31x10e0
  7. 1 inch equals
    2.54cm (exactly)
  8. Volume
    Amount of three-dimensional space 

    SI unit = m3
  9. Volume of gas and liquid are commonly measured in what unit?
    mL
  10. What does 1mL equal?
    1cm3

    1mL = 10-3L = 0.001L
  11. Mass
    Amount of matter present 

    SI unit=kg 

    1kg = 103g = 10000g
  12. 1kg = how many lbs?
    1kg = 2.2046lbs
  13. 1lb = how many grams?
    453.59grams
  14. Uncertainty in Measurement
    A measurement always has some uncertainty
  15. Significant Figures
    • Used to indicate the uncertainty of a measurement 
    • Measurements are report with one(last) uncertain digit
    • + or - 1
  16. Exact numbers
    • Numbers known with certainty
    • Have unlimited number of SFs

    • 1min=60 seconds
    • Number of people in a room
  17. Multiplying and dividing with SFs
    • Result has the same number of SFs as the measurement with the smallest number of SFs
    • Count SFs and round off to the correct SF
  18. Adding and Subtracting SFs
    You take the largest AU (uncertainty) and apply that to the answer
  19. 1lb =
    16oz
  20. Kelvin to Celsius conversion equation
    Tc = Tk - 273.15
  21. Ferinheight to Celsius conversion equation
    T= (TF - 32.00)/1.80
  22. Celsius to Ferinheight equation
    TF = 1.80(Tc) +32.00
  23. Celsius to Kelvin equation
    TK= TC + 273.15
  24. When converting how do you count SFs
    Report converted temp to the same amount of uncertainty as the original term
  25. Density
    • A property of matter representing the mass per unit vol
    • A conversion factor between mass and volume

    Density = Mass/Volume
  26. SI units for density (solid, liquid, gas)
    • Solids - g/cm3
    • Liquids - g/mL
    • Gasses- g/L

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