1.2 Units, Conversions, and Significant Figures

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Chad's Ultimate General Chemistry Course

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Sample Quiz - Units and Conversions

More Quizzes (over 1200 Questions) are available in Chad's Ultimate General Chemistry Review

The Metric System

Metric Prefixes
Terra 1012
Giga 109
Mega 106
kilo 103
centi 10-2
milli 10-3
micro 10-6
nano 10-9
pico 10-12
femto 10-15
atto 10-18
SI Units
Length m (meter)
Mass kg (kilogram)
Time s (second)
Temperature K (Kelvin)
Electric Current A (Ampere)
Luminous Intensity Cd (candela)
Derived Units
Volume m3 (cubic meter)
Energy/Work J (Joule)
Pressure Pa (Pascal)
Force N (Newton)
Power W (Watt)
Charge C (Coulomb)
Resistance Ω (Ohm)
Capacitance F (Farad)

Significant Figures

Rules for Zeroes with Significant Figures
1) Zeroes in between significant figures are significant.
2) Zeroes at the beginning of a number are insignificant.
3a) Zeroes right of the decimal, at the end of a number are significant.
3b) Zeroes left of the decimal (not visible), at the end of a number are NOT significant.