1. Basic Units
Length meters
Mass kilograms
Time seconds

2. Temperature Kelvin
Amount Chm Mole
Current Amphere
Luminous In Candela

3. Metric Prefixes >1 <1 Mega (M) Micro (m) Kilo (k) Nano(n)
>1 <1
Mega (M) Micro (m)
Kilo (k) Nano(n)
Milli (m) Pico (p)

4. Metric Prefixes
> 0
(G) = 109
(M) = 106
(k) = 103

5. Metric Prefixes
< 0
(m) = 10-3
(m) = 10-6
(n) = 10-9
(p) = 10-12

6. How close you are to the real answer
Accuracy
How close you are to the real answer

7. Precision
How well one can repeat his or her work
Repeatability

8. Uncertainty All measurements have a degree of unreliability
Usually in the last digit of a measurement

9. Significant Digits
Meaningful digits in a number

10. Multiplication Uncertainty
The answer should have the same number of significant digits as the multiplier with the least number of SD
Same for division

11. Addition Uncertainty When adding, line up decimal place & add
The decimal places in the answer should = the least
Same for subtraction

12. Determining Significance
All non-zero digits
All zeros between non-zero numbers
All trailing zeros if there is a decimal place

13. When do you leave Sig Figs alone?
Numbers obtained by counting or by definition are exact numbers.
# of students in the classroom
2.54 cm = 1 inch

14. PERIOD 4 stopped here

15. Scientific Notation
M x 10n
M = 1.00  M < 10.00
n = an integer

16. Conversion Factor Ratio equal to one 12 inches/1 foot
Multiply one unit by a conversion to obtain another unit w/o affecting magnitude

17. PERIOD 4 LEFT OFF HERE

18. Convert:
2.50 cm to Mm
4.2 ns to ms
3.15 kg to mg

19. Determine the length in miles of a light year
Light year = distance light travels in one year
c = 3.0 x 108 m/s
1 mile = 5280 ft
1 inch = 2.54 cm

20. Convert: 4.35 kg/L to mg/mL 2.31 mm/ns to cm/Ms

21. Calculate the volume in m3 occupied by 750 kg of gas with 1
Calculate the volume in m3 occupied by 750 kg of gas with 1.50 g/L 1 cm3 = 1 mL

22. Calculate the mass in kg of a board that has dimensions of 250 mm x 4
Calculate the mass in kg of a board that has dimensions of 250 mm x 4.0 x 104 mm x 2.5 m and had a density of 0.80 g/mL 1 ml = 1 cm3