Todays class we got 2 handouts: a picture of the periodic table (have not yet discussed) and a picture of some whimis symbols for lab safety. We are expected learn and memorize them because it will be on the chapter test.
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Class Notes:
MEASUREMENT AND CHEMISTRY:
- In Scientific Method, accurate measurements are essential.
- The most common system in use today is the SI system.
- The metric system started about 300 years ago in France.
7 FUNDAMENTAL UNITS:
- Mass (kg) - Kilograms
- Distance (m) - Meters
- Time (s) - Seconds
- Temperature (mol) - Billions
- Amount (K) - Kelvin
- Current (A) - Amps
- Luminosity (cd) - Candela
PREFIXES & SI UNITS:
Meter ---> Kilometers
1000m -> 1km
1 ---------> m
10^1 = (da) m
10^2 = (h)m
10^3 = (k)m
10^6 = (M)m
10^9 = (G)m
0.1m------------------> 10^-1 dm
0.01- 10^-2 = cm
0.001- 10^-3 = mm
0.0000001- 10^-6 = um - micro
0.00000000001- 10^-9 nm - nano
0.0000000000001- 10^-12 (p)m - pico
SIGNIFICANT DIGITS:
- Digits 1-9 are always significant
- Zeros are significant if they are right of a decimal.
- Example: 2.010 - significant
0.002 - insignificant
- Example: 2.010 - significant
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CLASS HOMEWORK:
Practice questions #7-8 Page 30 and Page 33 #9-10
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