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1.4 – Units of Measurement

1.4 – Units of Measurement. Summer AP Chemistry Homework Chapter 1. SI Units. These 5 will appear in this course!. The Metric System. Scientists use the metric system for all experimental measurements Based on the power of 10 (each prefix is a power of 10 away from the previous prefix)

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1.4 – Units of Measurement

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  1. 1.4 – Units of Measurement Summer AP Chemistry Homework Chapter 1

  2. SI Units These 5 will appear in this course!

  3. The Metric System • Scientists use the metric system for all experimental measurements • Based on the power of 10 (each prefix is a power of 10 away from the previous prefix) • Information on how to convert between prefixes can be found in section 1.6 of this unit.

  4. Most Important

  5. Temperature • There are two scales used in chemistry is the Kelvin and Celsius temperature scale • Kelvin is the official SI system based on the concept of absolute zero. We convert between Celsius and Kelvin using: • K = oC + 273.15 • The other scale is Celsius. To convert between Celsius and Fahrenheit scale we use the equation:

  6. Derived Units: Volume • The SI units are used to create all other units. These units are known as derived units. • Volume is a derived unit • Volume is the cube of a substances length (i.e. the derived SI unit for volume is m3). • Any metric unit cubed can be a unit of volume (e.g. mm3, cm3, etc.)

  7. Derived Units: Density • Density is the mass per unit of volume: • Remember, less dense substances float atop more dense substances. Least dense liquid Most dense liquid

  8. Class Example • Calculate the density of Hg if 1.00 x 102 g occupies a volume of 7.36 cm3

  9. Class Example • What is the mass in grams of a cube of gold (density = 19.32 g/cm3) if the length of the cube is 2.00 cm?

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