CHEM 1070 Lecture Notes - Lecture 4: Chemical Bond, Intermolecular Force, Chemical Reaction

• School: University of Iowa
• Department: Chemistry
• Course: CHEM 1070
• Professor: Alexeeva Natalia

Document Summary

If it occupies space adnd ahs weight it is matter. When atoms share connections, a chemical bond is formed. When 2 or more atoms are bonded, a molecule is formed. Molecular geometries contribute to properties bonds between atoms within a molecule are intramolecular (stronger) Solids and liquids have fairly strong intermolecular forces that cannot be ignored. In gases, the intermolecular forces are virtually nonexistent and can often be ignored. Solid particles are adjacent and locations fixed. Molecules may vibrate about location but do not move around each other. Amorphous local but not long-range order. Liquid (fluid*) particles are adjacent but move around each other. Gas (fluid*) particles are separated and move around each other. Compressible (neither morphs to container. volume nor shape is fixed) Pure substance - composed of 1 type of atom ore molecule. Element - matter of one type of atom has elemental composition. Compound - compound material formed of two or more elements in definite proportions.