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chem 120 final exam study guide/127 Questions & Answers
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chem 120 final exam studyguide/127 Questions & Answers
chemistry - -the science that tries to understand how matter behaves by
studying how atoms and molecules behave
-scientific method - -ways of learning that emphasizes observation and
experimentation (self correcting)
-observation - -we go out in nature and ask questions we measure or
observe some aspect of nature
-hypothesis - -tentative interpretation of an observation
-law - -summarizes a large number of observations
-theory - -model that explains and gives underlying causes for observation
-imprecise - -quick and easy like color
-precise - -measuring and proving like numbers
-scientific notation - -1x10^6
-significant figures - -indicates how good or bad a measurement is
-all non zeros are - -significant
-interior zeros - -significant
-trailing zeros before a decimal place - -significant
-trailing zeros after decimal place - -significant
-16.5400 - -6 sig figs
-130. - -3 sig figs
-5003 - -4 sig figs
-exact numbers - -unlimited sig figs
-3 - -unlimited sig figs
, -multiplication and division - -determined by the number with the fewest
significant figures
-addition and subtraction - -determined by decimal place
-tera - -T 10^12
-giga - -G 10^9
-mega - -M 10^6
-kilo - -k 10^3
-centi - -c 10^-2
-mili - -m 10^-3
-micro - -u 10^-6
-nano - -n 10^-9
-pico - -p 10^-12
-femto - -f 10^-15
-how many pounds does a person who weighs 14.8 stone weight
stone = 14 lbs - -207 lbs
-convert 3.0 cm2 to mm2 - -300 mm2
-density - -mass/volume
-if 5.32g of ethanol takes up 6.74ml of volume, what is the density in g/ml -
-0.789 g/ml
-matter - -Anything that has mass and takes up space
-can you undo a physical change - -yes
-can you undo a chemical change - -yes but it is very very difficult
-energy - -the capacity to do work
cal
joule
kilowatt kwh
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