Inteo to chemistry & the mole Flashcards
(17 cards)
how to convert from celsius to kevin
C+273
Accuracy
how close a measurement is to the accepted value
precision
how close several identical movements are to each other
qualitative
describable , not measurable
quantitative
numerical
rules for sig figs
- nonzero digits ALWAYS count
- zeros in front don’t count , like 0.05
- between count! 5.005
- zeros at end count ONLY if there’s a decimal point! 0.5340
scientific notation
number of zeros go to the 10th power , put a decimal point in between the first and second number. 12,500,00 , 1.25x10^7
negative 10th power moves a decimal point back. 5.67x10^-3 , 0.00567
physical properties
characteristics of a material that you can observe without changing the material. ex, color , shape , size , state
chemical properties
characteristics of matter that describe the ability for it to be transformed into a new substance. ex , flammable , nonreactive
physical change
change in a substance that does NOT involve a change in identity of a substance. ex , breaking a bottle
chemical change
chemical reaction occurs , taken place , substance changes into a new substance. new color forms for ex
separation techniques
distillation , filtration , centrifuge , chromatography
distillation
seperates solutions based on volatility or separates solid/liquid solutions
filtration
separation of solid / liquid mixture
centrifuge
separates liquids of different densities (separates solids & liquids)
chromatography
the separation of a mixture by passing it in solution , suspension , or as a vapor so that components love at different rates
when converting k to c what do you do
subtract 273
