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Chem Ch. 2

Measurements & Units

TermDefinition
Scientific Notation
Measurements quantitative observation number & unit involved
Exact quantities whole number quantity
Inexact measurements last digit is estimated
Accuracy how close measurements are to a true (known) value
Precision how close inexact measurements are to each other
Significant Figures precision of a measurement
Sig figs - exact measurement infinite sig figs
Sig figs - non-zero digit always significant
Sig figs - leading zero (0 that's LEFT to first non-zero digit) never significant
Sig figs - captive zero (0 between non-zero digits) always significant
Sig figs - trailing zero (0 to RIGHT of last non-zero digit) AFTER DECIMAL always significant
Sig figs - trailing zero (0 to RIGHT of last non-zero digit) BEFORE DECIMAL use scientific notation to figure it out
Prefixes - kilo (k) 1000 base unit
Prefixes - Mega (M) 10^6 base unit
Prefixes - deci (d) 10^-1 base unit
Prefixes - centi (c) 10^-2 base unit
Prefixes - mili (m) 10^-3 base unit
Prefixes - micro () 10^-6 base unit
Prefixes - nano (n) 10^-9 base unit
Sig figs - Addition/Subtraction least number of decimal places
Sig figs - Multiplication/Division least number of sig figs
Conversion factors units multiplied/divided to be canceled out
Density D = M/V
Created by: nat.riv
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