1. 15 Sept. 2010 Homework: Background info paragraph
Objective: SWBAT make and record accurate measurements using scientific equipment.
Do now: Name a piece of equipment used to measure mass, two that measure volume, and one that measures length.
SWBAT make and record accurate measurements using scientific equipment.

2. Agenda Do now Making measurements stations Discussion
Notes on science equipment
SWBAT make and record accurate measurements using scientific equipment.

3. Making measurements stations
Record all your data on your lined paper. Be sure to label what it is.
Ex:
Station 1
Mass of block: g
SWBAT make and record accurate measurements using scientific equipment.

4. Making Measurements in Chemistry

5. Length: Meter Stick Units: centimeters (cm), meters (m)
SWBAT make and record accurate measurements using scientific equipment.

6. Mass: Electronic Balance
Grams (g), kilograms (kg)
SWBAT make and record accurate measurements using scientific equipment.

7. Mass: Triple Beam Balance
Grams (g), kilograms (kg)
SWBAT make and record accurate measurements using scientific equipment.

8. Volume Liters (L), milliliters (mL) cubic centimeters (cm3)
(“100 cc’s of saline, STAT!”)
Volume

9. Beaker
SWBAT make and record accurate measurements using scientific equipment.

10. Graduated Cylinder
SWBAT make and record accurate measurements using scientific equipment.

11. Burette
SWBAT make and record accurate measurements using scientific equipment.

12. Graduations: lines on lab equipment for measuring volume.
SWBAT make and record accurate measurements using scientific equipment.

13. Meniscus Read the volume at the BOTTOM of the curve!
Caused by surface tension of liquids (esp. water)
SWBAT make and record accurate measurements using scientific equipment.

14. Meniscus
SWBAT make and record accurate measurements using scientific equipment.

15. Temperature: Thermometer
Degrees Celsius oC
SWBAT make and record accurate measurements using scientific equipment.

16. Graduated Cylinder Beaker Burette
Least Accurate
Most Accurate
Test tube
Graduated Cylinder
Beaker
Burette
Fewest Graduations
Most Graduations
SWBAT make and record accurate measurements using scientific equipment.

17. When reading a piece of equipment, you can “guess” the last digit.
SWBAT make and record accurate measurements using scientific equipment.

18. Uncertainties in Measurements

19. Uncertainties: ± (“plus or minus”) a range of values in which your measurement falls
These do not affect your results
Ex: Your graduated cylinder is accurate to ±0.05 mL (could be up to 0.05 mL too high or too low!)
SWBAT make and record accurate measurements using scientific equipment.

20. Graduated Cylinder Beaker Burette
Least Accurate
Most Accurate
10 mL
1 mL
0.1 mL
Test tube
Graduated Cylinder
Beaker
Burette
Fewest Graduations
Most Graduations
SWBAT make and record accurate measurements using scientific equipment.

21. Uncertainty = ± half of the smallest graduation
Uncertainties: ± (“plus or minus”) a range of values in which your measurement falls
These do not affect your results
Ex: Your graduated cylinder is accurate to ±0.05 mL (could be up to 0.05 mL too high or too low!)
Uncertainty = ± half of the smallest graduation
SWBAT make and record accurate measurements using scientific equipment.

22. 36.5 ± 0. 5 mL
Uncertainty
SWBAT make and record accurate measurements using scientific equipment.

23. 52.9 ± 0.5 mL
SWBAT make and record accurate measurements using scientific equipment.

24. SWBAT make and record accurate measurements using scientific equipment.

25. SWBAT make and record accurate measurements using scientific equipment.

26. 27.5 ± 0.5 mL
SWBAT make and record accurate measurements using scientific equipment.

27. SWBAT make and record accurate measurements using scientific equipment.

28. 40.05 ± 0.05 mL
SWBAT make and record accurate measurements using scientific equipment.

29. SWBAT make and record accurate measurements using scientific equipment.

30. SWBAT make and record accurate measurements using scientific equipment.

31. cm
SWBAT make and record accurate measurements using scientific equipment.

32. Which is the most accurate? Why?
SWBAT make and record accurate measurements using scientific equipment.

33. What is the volume in this graduated cylinder (in mL)?
What is the uncertainty?
What equipment could you use to find a more accurate measurement for this volume?
Do you think this graduated cylinder is accurate? Why or why not?
If I read volumes of 8.11, 8.12, and 8.10 mL from this picture, would my answer be accurate, precise, both, or neither? Explain your answer.
SWBAT make and record accurate measurements using scientific equipment.

34. Homework: Read Density of Pennies lab; reading quiz Tues.
Tomorrow: Clickers! and brainstorming background info section for lab report.
Homework: Read Density of Pennies lab; reading quiz Tues.
SWBAT make and record accurate measurements using scientific equipment.