Chemistry Flashcards
addition w sig figs
final answer should end in same place as least sig. term. If one has 1 dec point, and other has 2, final answer ends with 1 decimal point.
sig fig rules
all non 0 digits are sig
all sandwiched 0s are sig
all leading 0s are not sig
trailing 0s are sig when there’s a decimal point
multiplying w sig figs
count total # of sig figs in each term, and whichever has lower amount use that. If it’s 1400, do 1.4*10^3. scientific notation shows to the end of the whole number, but sig figs show sig numbers
accurate
accurate when it’s close to the accepted value. use %error
precise
when values are close to each other. use % deviation
% error
(|measured-actual|\actual)*100
average deviation
(measurment 1 - avg.)+(meas. 2 - avg.)…/# of measurments
percent deviation
first find average deviation
(average deviation/average)*100
density units
g/mL
distance base unit
meter
converting to density
- get to g/mL
- multiply by density
- convert to needed units
.62 miles
1 km
C to K
K = C +273
K to C
C = K-273
matter
- matter is made of particles surrounded by empty space
- anything that has mass and takes up space
Mixture
- has comma or &
- matter is a mixture if there are different types of particles present
- can either by homogenous or heterogenous