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What are the standard units for length, mass, time, volume, and amount?
- length - meter
- mass - kilogram
- time - second
- volume - liter
- amount - mole
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What are the base unit abbreviations for meter, gram, second, liter, and mole?
- meter - m
- gram - g
- second - s
- liter - L
- mole - mol
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King Henry died by drinking chocolate milk?
Hilo Hecto Deka Base Deci Centi Milli
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WhHow much is in a mole?
6.02 x 1025
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What is the relationship between 1 mL and cms?
1 mL = 1 cm3
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What is accuracy?
How close a measurement is to the true value
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What is precision?
How close repeated measurements are to each other
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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
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What is the percent error for high, acceptable, low and poor accuracies?
- High < or = 5%
- Acceptable 5% < PE < or = 10%
- Low > 10%
- Poor > 15%
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What is standard deviation?
- A measure of precsion
- -Low values are good
- -Units are the same as the data
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What is relative deviation?
- (SD/Average)100
- -Low values are good
- -Unit is %
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What is an error in reading a scale due to incorrect eye positioning?
Parallax
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What does more digits imply for a reading?
- A finer calibrated scale
- (Less digits implies a coarser calibrated scale)
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What is density?
- p= m/V
- -units are g/cm3 or g/mL
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Where should you read a measurement of a liquid?
At the bottom of the meniscus
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What kind of device can be used to measure many volumes?
A graduated device
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What kind of device can measure just one volume?
A volumetric device
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When pouring liquids, what does TC mean?
- To contain
- -Shake out remaining substance
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When pouring liquids, what does TD mean?
- To deliver
- - Do not shake out remaining substance
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