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Unit 1.2

Introduction to Chemistry for Allied Health Sciences Measurements and Units Kirk Hunter Chemical Technology Department Texas State Technical College Waco. Unit 1.2. Measurements and Units. Measurement. A number with UNITS inches, pound, quart centimeter, gram, milliliter. Measurement.

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Unit 1.2

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  1. Introduction to Chemistryfor Allied Health SciencesMeasurements and UnitsKirk HunterChemical Technology DepartmentTexas State Technical College Waco Unit 1.2

  2. Measurements and Units

  3. Measurement • A number with UNITS • inches, pound, quart • centimeter, gram, milliliter

  4. Measurement • Length - meter • Volume - liter • Mass – gram • Time – second • Temperature - Celcius

  5. Mass • Mass - amount of matter • Measured with a balance. • A Balance is not affected by the earth’s gravity.

  6. Mass • Mass and Weight are NOT the same! • Weight is the FORCE exerted by gravity on an object.

  7. Volume • Amount of space occupied by a solid, liquid or gas.

  8. Volume Measurement • Graduated cylinder • Syringe • Buret • Pipet • Volumetric Flask

  9. Metric System

  10. MEASURING MATTER The Metric System The metric system was developed in 19th century France. The United States is one of the few countries not using the metric system.

  11. MEASURING MATTER The Metric System Three basic units for measuring matter: • gram (mass) • liter (volume) • meter (distance)

  12. MEASURING MATTER The Metric System The units are expressed in multiples of 10.

  13. Metric System Prefixes 106 103 100 10-1 10-2 10-3 10-6 M k base unit d c m µ

  14. The Metric System 1 Mg = 106 g 1 kL = 103 L base unit 1 dm = 10-1 m 1 cg = 10-2 g 1 mL = 10-3 L 1 µm = 10-6 m

  15. The Metric System 1 Mg = 106 g 1 kL = 103 L base unit 1 m = 101 dm 1 g = 102 cg 1 L = 103 mL 1 m = 106 µ m

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