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Chemistry: SI Units & Conversions

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Chemistry: SI Units & Conversions. SI Base Units of Measure commonly used in chemistry. Time: second (s) Length,distance: meter (m) Mass: kilogram (kg) In class, we consider the “base unit” to be grams. Volume: liter (l) Temperature: Kelvins (K) note: no degree symbol

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si base units of measure commonly used in chemistry
SI Base Units of Measurecommonly used in chemistry
  • Time: second (s)
  • Length,distance: meter (m)
  • Mass: kilogram (kg)
    • In class, we consider the “base unit” to be grams.
  • Volume: liter (l)
  • Temperature: Kelvins (K) note: no degree symbol
    • In chemistry lab, we use the Celsius temperature scale. ( °C)
derived units
Derived Units
  • A derived unit is one in which the units are combined mathematically.
    • Volume: cubic centimeter (cm3)
      • (cm x cm x cm)
    • Area: square meter (m2)
      • ( m x m)
    • Density: mass  volume
converting celsius to kelvin
Converting Celsius to Kelvin

Kelvins = C + 273

°C = Kelvins - 273

prefixes for si units
Prefixes for SI Units
  • Prefixes for units smaller than 1:
    • micro () 1 X 10-6 or
    • milli (m) 1 X 10-3 or
    • centi (c) 1 X 10-2 or
    • deci (d) 1 X 10-1 or
  • Prefixes for units larger than 1:
    • kilo (k) 1 X 103 or 1,000
slide6

Conversion Using the Factor-Labeling Method : (Dimensional Analysis)

Starting unit

Target unit

Problem: Convert 32.05 cm to m

=

X

Step 1: write down the starting measurement: number and unit!

Step 2: Convert from this prefix to the base unit. (This means meters, liters or grams.)

Step 5 If you have arrived at the target unit, you are done!

Be sure to include the unit and significant figures in your answer!

Step 3: Cancel the units that divide each other out.

Step 4: Perform the math… divide by the numbers on the bottom, multiply by the numbers on the top!

slide7

Practice!

Convert 0.00450 km to cm

?

X

X

=

The correct answer is 450 cm, but that’s only 2 sig figs…. ?????

Use scientific notation to correct the sig figs!

4.50 x 102 cm

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