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Chemistry 121 - Lecture Notes

Chemistry 121 - Lecture Notes - 1.3 Properties of Matter...

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September 19, 2007 1.3 – Properties of Matter - Physical property: can be measured without changing identity or composition of the substance o Color, density and melting point - Chemical property: describes way a substance may change or react to other substances o Flammability, oxidation H2(g) + O2(g) -> H20(g) - Intensive properties: does not matter based on amount being examined (density) - Extensive properties: depends on quantity being measured (mass, volume) - Physical changes: changes in stat. l->g->s - Chemical changes: chemical reaction; substances is transformed into a chemically different substance - Separation of mixtures: properties (density, color), filtration, distillation, chromatography - Theory: brings the hypothesis and law together 1.4 – Units of Measurements - A measured quantity must have both a number and a unit: g, L, m 2.8 – Naming Inorganic Compounds - Names and formulas of ionic compounds o Consists, usually, of a metal and nonmetal o Name cation first, then anion CaO: Calcium oxide o Cation: named using name of element o Monatomic anions use stem name of element and then the suffix –ide - Names of formulas of binary molecular compounds o 2 NM’s o uses Greek prefixes to indicate number of atoms in element o KNOW TABLE 1.2, 2.4, 2.5 Chapter 1 – Matter and Measurement - Matter: anything that has mass and takes up space - Property: any characteristics that allows us to recognize a particular type of matter - Atom: building blocks - Molecule: combination of atoms - Properties of matter are related to: o Composition (types of atoms present) o Structure 1.2 – Classification of Matter - States: gas, liquid, solid - Pure substance: matter that has distinct properties and a composition that doesn’t vary from sample to sample
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- Element: can’t be decomposed into simpler substances - Compound: substance composed of 2 or more elements -
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Chemistry 121 - Lecture Notes - 1.3 Properties of Matter...

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