C1_properties_fillin_outline_POST1.pdf - Learning Objectives You should be able to \u2022 utilize dimensional analysis to do unit conversions \u2022 explain

C1_properties_fillin_outline_POST1.pdf - Learning...

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Unformatted text preview: Learning Objectives You should be able to • utilize dimensional analysis to do unit conversions. • explain the reason significant figures are important in science. • define density and convert between Celsius and Kelvin • identify the number of significant figures a measurement has. • identify the correct number of significant figures the in the answer to a problem. I1 - Dimensional Analysis • A football field is 100 yards long • A yard is 3 feet • A foot is 12 inches • An inch is 2.54 cm How many cm in a football field? I2 - Density and Temperature • Density: mass of certain volume of substance • Temperature – SI unit is Kelvin – should always work in Kelvin – oC to K – oF to oC I3 - Making Measurements Measurements have some degree of uncertainty I4 - Precision vs. Accuracy • Precision: • Accuracy: 2 I5 - Significant Figures • Represent precision of measurement • Rules with zeros can be tricky • Leading zeros (0.015) • Captive zeros (Chem 101) • Trailing zeros (150 vs. 150. vs. 150.0) • Exact numbers (not measurements) I6 - Scientific Notation: A review 11000 = 0.00021 = 0.001021 = 1730= 6.022 x 10-23= I7 - Math and Sig Figs • Multiplication and division 4.56x1.4= • Addition and Subtraction: 1.3 1.225 + 10.45 2 I8 - Units • • • • The unit is the scale of which a measurement is made All measurements should have a unit Units can help direct how a problem should go 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 kilo k 1,000 10 hecto h 100 10 deka da 10 10 1 10 deci da 0.1 10 centi c 0.01 10 milli m 0.001 10 micor µ 0.0000001 10 nano n 0.000000001 10 6 3 2 1 0 -1 -2 -3 -6 -9 Learning Objectives You should be able to: • define substance, property, and mixture terms. I9 - Atoms, Molecules, and Compounds • Substance• Atom – • Molecule• Elementary substance• Compound substance• Chemical formula – • Molecular substance – • Ionic compound – 3 I10 - Classification of Matter • Matter: • 3 Phases – – Solid – – Liquid – – Gas – I11 - Properties • Specific characteristics that can distinguish substances • Physical properties- – Chemical change I12 - Mixtures • Heterogeneous Mixture: • Homogenous Mixture: Pure Substance • Cannot be separated by any physical means • Separation of saltwater: • Water ( • Salt ( ) is a pure substance ) is a pure substance Pure Substance 4 ...
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  • Fall '08
  • Kenney
  • International System of Units, Kilogram, Chemical substance, Chemical compound, Kelvin –

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