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Chemistry in the Community Water: Exploring Solutions

Chemistry in the Community Water: Exploring Solutions. Overview of Section A. Sources and Uses of Water Direct and indirect use Water purification Water cycle Skills Scientific method Metric system Lab safety Water purification procedures. Activity: Sources and Uses of Water.

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Chemistry in the Community Water: Exploring Solutions

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  1. Chemistry in the CommunityWater: Exploring Solutions

  2. Overview of Section A • Sources and Uses of Water • Direct and indirect use • Water purification • Water cycle • Skills • Scientific method • Metric system • Lab safety • Water purification procedures

  3. Activity: Sources and Uses of Water

  4. Activity: Sources and Uses of Water Questions: • Are all sources equally useful? Explain why or why not? • Are any of the sources interchangeable? Explain why or why not. • Are any limited in availability? Explain why or why not • Which source (or sources) would be used most frequently? Why? • Can we take the availability of water for granted? Why or why not? • How would you group the different uses of water?

  5. Metric System • Why metric? • Chemistry is a quantitative science, supported by measurements and calculations • Internationally adopted as an SI unit (SI = Le Systeme International d’Unites) • Base units from which other units are derived

  6. Metric System

  7. Metric System • Metric conversions

  8. Metric System • Metric conversions • Quantities can be converted from one unit to another through the use of equivalences (how they compare to each other) and a conversion factor.

  9. Metric System • Metric conversions • Examples: • Equivalence: 1 kilogram = 1000 gram • Conversion factor: 1 kilogram or 1000 gram 1000 gram 1 kilogram • To convert 4573 g into kg multiply as follows: 4573 g X 1 kg = 4.573 kg 1000 g

  10. Metric System • Metric conversions • More Examples:

  11. Metric equivalences

  12. Metric conversions • Examples: • Equivalence: 1 kilogram = 1000 gram • Conversion factor: 1 kilogram or 1000 gram 1000 gram 1 kilogram • Equivalence: 100 milligram = 1 decigram • Conversion factor: 100 milligram or 1 decigram 1 decigram 100 milligram

  13. Metric conversions • Examples from ladder worksheet

  14. Direct and Indirect Uses of Water • Can of orange juice takes ~120 L to produce • A hard boiled egg takes ~450 L to produce • What is your first reaction to these volumes?

  15. Direct and Indirect Uses of Water • If you were to eat 2 eggs and one 1.3 L carton of orange juice you will have expended as much water as…… …taking 10 showers …washing 10 loads of clothes …washing 25 loads of dishes …or flushing 100 times WOW!!

  16. Direct and Indirect Uses of Water WHY??

  17. Direct and Indirect Uses of Water Direct use examples Indirect use examples

  18. Direct and Indirect Uses of Water • Direct Use = • Indirect Use =

  19. Histogram • A frequency distribution that shows how often each different value in a set of data occurs. • A column chart • Based on data set determine bin size

  20. Time Students Spend Texting on Cell Phone Time (minutes)

  21. Time (minutes) Range, median, mean

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