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COS 12

COS 12 . Identify Metric Units for mass, temperature, and density. . Notes:Color Guide. Gold : Important concept. Write this down. Orange : Definition. Write this down. Blue : Important information, but you do not need to copy. Red : Example. Copy if needed.

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COS 12

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  1. COS 12 Identify Metric Units for mass, temperature, and density.

  2. Notes:Color Guide • Gold: Important concept. Write this down. • Orange: Definition. Write this down. • Blue: Important information, but you do not need to copy. • Red: Example. Copy if needed. • White: General Discussion (Don’t Copy)

  3. Although there are many different branches of science, all scientists follow the same procedures. Definition: critical thinking – the process of analyzing data & information to produce a solution. Let’s try a few examples: Would it be possible for a man to marry his widow’s sister? No, because the man is dead! If you have only one match and you walked into a room where there was an oil burner, a kerosene lamp, and a wood burning stove, which one would you light first? You should light the match first.

  4. Data collection is especially important in science. • Data comes in all types. Some examples of data: • Temperature • Distance • Composition • Speed • Time • Most data is described using a unit of measurement. • Definition: unit – a quantity used to measure data. • Example: Centimeters is a unit that measures length or distance. If I said that I had 58, would it mean anything to you? 58 cents? Dollars? Bananas?

  5. A m • Definition: base unit – a unit that cannot be broken down into other units. There are 7 base units. • Length/Distance: meter (m) • Mass: Kilogram (kg) • Time: second (s) • Temperature: Kelvin (K) • Volume: Liters (L) • Electric Current: Amp (A) • Molecular Weight: Mole (mol) We will define these units as we come across them. kg s L mol K m kg s K A mol L

  6. Definition: derived unit – a unit composed of 2 or more base units. There are many, many derived units. You may recognize some, like area, volume, and speed. • Example: km/h (kilometers per hour) is a derived unit. • Km/h is a unit of speed. It is derived from distance and time.

  7. Scientists use SI when they take measurements. • Definition: SI – a complete system of units for scientists that is the same worldwide. Based on multiples of 10. • SI means “system international”. • Some examples of NON-SI units: • Pounds • Inches • Feet • Miles • Ounces • Cups • Gallons Most of these units are used only in the USA.

  8. Many SI units are based on the metric system. Units can be made larger or smaller by adding a prefix. • Definition: metric prefix – a name placed before a unit that changes the amount of that unit. • Metric Prefixes: • Kilo (1000) • Hecto (100) • Deka (10) • Deci (.1) • Centi (.01) • Milli (.001) Kilogram Prefix Base Unit

  9. Examples: • 5 kilograms is the same as 5000 grams. • 10 centimeters is the same as .01 meters. • 10 millimeters is the same as 1 centimeter.

  10. What is density? • Density- is a comparison of how much matter there is in a certain amount of space.

  11. What is density? • Density = mass OR mass ÷ volume. volume • Units for density: g . cm3 Volume can also be measured in (mL). 1mL = 1cm3 • Why are these the units for density? ALWAYS REMEMBER UNITS!

  12. Let’s try a density problem together • Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density? • Frank also has an eraser. It has a mass of 3g, and a volume of 1cm3. What is its density?

  13. Work on these problems with your neighbor. • Jack has a rock. The rock has a mass of 6g and a volume of 3cm3. What is the density of the rock? • Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm3. What is the density of the rock?

  14. Now, try these on your own. • Al’Licia has a watch. It has a mass of 4g and a volume of 2cm3. What is the density of the watch? • Mia has a wallet. It has a mass of 15g and a volume of 5cm3. What is the density of the wallet?

  15. Liquid Layers • If you pour together liquids that don’t mix and have different densities, they will form liquid layers. • The liquid with the highest density will be on the bottom. • The liquid with the lowest density will be on the top.

  16. Liquid Layers • Check out this picture from your book. Which layer has the highest density? • Which layer has the lowest density? • Imagine that the liquids have the following densities: • 10g/cm3. 3g/cm3. • 6g/cm3. 5g/cm3. • Which number would go with which layer?

  17. Review • What is the formula for density? • What happens if you pour together liquids that have different densities? • Will the liquid on the top have the highest or lowest density? • Will the liquid on the bottom have the highest or lowest density?

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