SI units Standardized units mass kilogram kg length meter m time second s

# Si units standardized units mass kilogram kg length

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SI units: Standardized units: mass - kilogram (kg) length - meter (m) time - second (s) temperature - Kelvin (K) amount of substance - mole (mol) electrical charge- Coulomb (C) Metric prefixes mega M 1,000,000 10 6 kilo k 1,000 10 3 hecto h 100 10 2 deka da 10 10 1 - 1 10 0 deci da 0.1 10 -1 centi c 0.01 10 -2 milli m 0.001 10 -3 micor P 0.0000001 10 -6 nano n 0.000000001 10 -9 ,³ ² Atoms, Molecules, and Compounds Substance- Atom – Molecule- Elementary substance- Compound substance- Chemical formula – Molecular substance – Ionic compound –
4 ,±² ³ Classification of Matter Matter: 3 Phases – Solid – Liquid – Gas – ,±± ³ Properties Specific characteristics that can distinguish substances Physical properties- Chemical change ,±´ ³ Mixtures Heterogeneous Mixture: Homogenous Mixture: Pure Substance Cannot be separated by any physical means Separation of saltwater: Water ( ) is a pure substance Salt ( ) is a pure substance Pure Substance
Dimensional analysis lecture examples DA1) Dimensional Analysis Calculate the volume of air that an adult person exhales in an 8-hour day. Assume that each breath has a volume of about 0.5 L and that the person exhales 15 times a minute. DA2) Dimensional Analysis - Molarity Molarity (M) has units of ௠௢௟ ௦௢௟௨௧௘ ௦௢௟௨௧௜௢௡ . How many grams of NaCl (solute) need to be dissolved to make 2.0 L of 0.010 M solution? The molar mass of NaCl is 58.4 g mol -1 .

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• Fall '08
• Kenney