Chemistry issy highschool unit 1 sig figs and dimensional analysis
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14 Terms
elements
substances made up of identical particles/atoms. EX: hydrogen H2
mixtures
a mix of different particles
compounds
made of 2 or more types of atoms. EX: water H2O
heterogenous
non-uniform composition (different in each sample)
homogenous
uniform composition looks the same in every sample ex: Playdough
Molecules
a group of atoms with 2 or more atoms (same or different atoms)
mixtures
a composition of different molecules mixed together. EX: air (N2 & O2 & Ar & CO2)
*mixtures are usually identified with a & symbol in them
sig figs
final answer can only be as precise as the least precise value used in the calculation EX: 101.25+3536.2+123.448 = 3760.898 after rounding to the number with the least sig figs *5* the final answer is 3760.9
sig figs with a decimal point and no decimals
all numbers after the decimal are sig figs