Notes- Stoichiometry

Metric Measurements

109---giga---G
106---mega---M
103---kilo---k
102---hecto---h
101---deca---da
10-1---deci---d
10-2---centi---c
10-3---milli---m
10-6---micro---µ
10-9---nano---n

Significant Figures

Rule 1- All nonzero figures are significant. ex. 721= 3 sig figs
Rule 2- When a zero falls between nonzero digits, that zero is significant. ex. 106= 3 sig figs
Rule 3- When a zero falls after the decimal point and after a significant figure, that zero is significant. ex. 1.50= 3 sig figs
Rule 4- When a zero is used merely to indicate the position of the decimal, that zero is not significant. ex. 1210=3 sig figs, 0.053= 2 sig figs
Rule 5- All counting numbers and exact numbers are treated as if they have an infinite number of significant figures. 10= infinite number of sig figs