CHEM 151 1st Edition Lecture 8 Outline of Last Lecture I. Ideal Gas ModelII. Ideal Gas LawOutline of Current Lecture III. Understanding DifferencesIV. Elemental Substances V. Molecular or Covalent CompoundsVI. Molecular RepresentationsCurrent LectureMany differences between substances are attributed to intermolecular forces. Intermolecular force are different because:1. Structure (packing of particles)Ex: ice and water2. CompositionEx: H2O and H2O2Elemental substances consist of only one type of atom. Elemental atom- Na for example Elemental molecule- non-metals; Cl2 for exampleCompounds are made up of two or more different atoms. Molecular representations:- Molecular formula: C2H5NO2- Structural formula: CHH CHHOO HN- Condensed formula: H2NCH2COOH- Ball and Stick: -
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