1. Units of Measurement

2. Drill # 89/4/2014  Write drill # 8 and the date in your notebook  Copy the questions (they are on the right side of the board)  Answer  7 minutes, everyone is quiet and in her/his seat

3. Topic: Units of Measurement Objective: Students will be able to  Name the basic metric units and give examples of derived units  Measure length and liquid volume HW #7: Get worksheet

4. Number vs. Quantity  Quantity - number + unit No Naked Numbers! UNITS MATTER!!

5. SI Units (copy) QuantityBase UnitSymbol Length Mass Time Temp meter kilogram second kelvin m kg s K CurrentampereA

6. Changing the size of SI Units mega-M10 6 deci-d10 -1 centi-c10 -2 milli-m10 -3 PrefixSymbolFactor micro-  10 -6 nano-n10 -9 pico-p10 -12 kilo-k10 3

7. Derived Units (copy)  Combination of base units.  Derived by multiplying or dividing quantities to get new quantities  Volume = length  length  length cm x cm x cm = cm 3 1 cm 3 = 1 mL 1 dm 3 = 1 L  Density = mass /volume (g/cm 3 )

8. The Metric System  In science class we use the Metric System.  The metric system is simpler and easier to use  Most countries only use the metric system.  In the US we still use the English System except in science.

9. 1 inch = 2.54 centimeters

10. Compare  1 mile = 1.6 km  1 yard = 0.9444 meters

11. The ruler  1 cm = 10 mm  What is the length of the line in centimeters?  2.80 cm  What is the length of the line in millimeters?  28.0 mm

12. Correct way to record measurement (copy)  Include all digits below the mark  Add one more digit that is estimated  If the mark is exactly on the line you still have to add the extra digit  make it “0”  This is how you tell that the mark was on the line

13. Measuring Volume of Liquids (copy)  Graduated cylinder  The curve is called meniscus  Place cylinder on level surface  Move so your eyes are at meniscus level  Read the “ruler” at the bottom of the meniscus

14. What causes menisc us (copy)  The molecules of the liquid stick to the walls of the cylinder

15. Parallax error-when you are looking at an angle

16. Parallax error

18. What is the volume? A. 52.0 mL B. 37.0 mL C. 26 mL

19. Derived unit for Density You have a sample with a mass of 620 g & a volume of 753 cm 3. Find density. GIVEN: M = 620 g V = 753 cm 3 D = ? D M V WORK : D = M V D = 620 g 753 cm 3 D = 0.82 g/cm 3

20. Drill # 99/5/2014  Write drill # 9 and the date in your notebook  Copy the questions (they are on the right side of the board)  Answer  7 minutes, everyone is quiet and in her/his seat

21. Topic: Measuring Part I Objective: Students will be able to  Use proper tecniques to measure length and liquid volume HW Free Friday

22. Guided Practice  Group work  Individual paper!  Choose your role  Obtain worksheet  Obtain materials  Read directions  Complete assignment  Return materials  20 minutes  Materials  Rulers  10 pennies  Graduated cylinder  Eye dropper  Cup  Water in the cup

26. Did we achieve objectives? Objective: Students will be able to  Name the basic metric units and give examples of derived units  Measure length and volume

27. What is your HW for tonight 1. Complete the HW#7 worksheet

28. Exit Ticket  ID#, in your seat, and quiet  Questions: 1. Name the unit for: a) mass b) Time c) Temperature d) Length 2. What is meniscus (in chemistry) ?