# CHEMISTRY Lab Skills

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1. What are the standard units for length, mass, time, volume, and amount?
• length - meter
• mass - kilogram
• time - second
• volume - liter
• amount - mole
2. What are the base unit abbreviations for meter, gram, second, liter, and mole?
• meter - m
• gram - g
• second - s
• liter - L
• mole - mol
3. King Henry died by drinking chocolate milk?
Hilo Hecto Deka Base Deci Centi Milli
4. WhHow much is in a mole?
6.02 x 1025
5. What is the relationship between 1 mL and cms?
1 mL = 1 cm3
6. What is accuracy?
How close a measurement is to the true value
7. What is precision?
How close repeated measurements are to each other
8. What is percent error?
• A measure of accuracy
• abs(O-T)/T x 100%
• O is the obersved value
• O should be an average of several trials
• T is the true value
9. What is the percent error for high, acceptable, low and poor accuracies?
• High < or = 5%
• Acceptable 5% < PE < or = 10%
• Low > 10%
• Poor > 15%
10. What is standard deviation?
• A measure of precsion
• -Low values are good
• -Units are the same as the data
11. What is relative deviation?
• (SD/Average)100
• -Low values are good
• -Unit is %
12. What is an error in reading a scale due to incorrect eye positioning?
Parallax
13. What does more digits imply for a reading?
• A finer calibrated scale
• (Less digits implies a coarser calibrated scale)
14. What is density?
• p= m/V
• -units are g/cm3 or g/mL
15. Where should you read a measurement of a liquid?
At the bottom of the meniscus
16. What kind of device can be used to measure many volumes?