CHMA10H3 Lecture Notes - Lecture 5: Electrical Resistivity And Conductivity, Covalent Bond, Ion

• School: UTSC
• Department: Chemistry
• Course: CHMA10H3
• Professor: Andrew Petter

Document Summary

Chma10h3 - introductory to chemistry i: structure and bonding lecture 5: models of. Substances are categorized on the basis of physical properties : covalent network substances. Ionic substances: metallic substances, molecular substances, different models of molecular structure explains differences in physical properties. Properties: high melting point: large amounts of energy need to be supplied to break allof the covalent bonds. Lack of electrical conductivity: there are no mobile charged particles: hardness: strong covalent bonds in multiple directions. Ionic compounds are composed of electrically charged particles called ions: some ions have a positive charge (cations) and some negative charge (anions) Ions with different charge are held together by the electrical force of attraction. Ions form a three-dimensional repeating network called an ionic lattice. Properties: high melting point: a large amount of energy is needed to overcome the attraction between neighbouring ions, electrical conductivity: solid ionic substances do not conduct electricity as there are no mobile charged particles.