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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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what is chemistry
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the science that systematically studies the composition, properties, and activity of organic and inorganic substances and various elementary forms of matter
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what is not made of chemicals
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sunlight, dreams
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what is important to know what lab safety
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wear googles,
-dont eat - wear closed-toed shoes, keep hair up, clean up spills, don't throw chemicals in drain or put them back in their original containers |
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qualitative
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description of observation
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quantitative
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observation in #
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what is a fair test?
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experiment where you change one factor at a time while keeping all the other conditions the same
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what is wrong with the 5-step scientific method?
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-too simple
-summarizes science instead showing what science can do |
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NNN
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no naked numbers
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NNU
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no nonsense numbers
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SI
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modern form of the metric system
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Length
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meter
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m
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Mass
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kilogram
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kg
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Time
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second
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s
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Temperature
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Kelvin
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K
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Volume
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Liter
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L
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Amount of Substances
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mole
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mol
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Mega
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M
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million
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Kilo
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k
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thousand
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Deci
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d
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tenth
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Centi
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c
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hundredth
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Milli
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m
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thousandth
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Micro
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upside h
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millionth
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Nano
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n
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billionth
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Pico
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p
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trillionth
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Accuracy
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getting close to a standard value on a given trial
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precision
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getting close to the same value after repeated trials
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accuracy error
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percent of class average - your data
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precision error
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|(experimental value)- (theoretical value)| / theoretical value x 100=
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density
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mass (g)/ volume (mL)
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Sig Figs (significant figures)
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tell us how good the data we are using
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Sig Fig rules
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1: any # that isn't zero is significant. any zero between 2 # aren't zeros are significant
2: any zero before all the nonzero digits are significant 3: any zero thats after all of nonzero digits is significant only if you see a decimal point 4: when you write # in scientific notation only the x part is counted in sig figs |
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