CHEM101 Study Guide - Silicon Carbide, Enthalpy, Dynamic Equilibrium

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Strong intramolecular forces (strong bonds within the molecule) But relatively weak intermolecular forces (much weaker than the molecule"s bonds) Ch4, co2, i2, br2 low moderate m. p. (size and # electron dependent) soluble in non polar solvents dipole dipole. Hcl, chcl3 soluble in polar solvents low moderate m. p. Examples: c (diamond), silicon carbide (replace half c by si) Hg is a liquid at room temperature. Remember: low m. p. doesn"t mean a weak covalent bond. Each c atom is bonded to 4 other c atoms and the network is extended throughout the solid in all directions. So diamond is an electrical insulator (or poor conductor) Sheets / layers (see figure next slide) resulting in a structure with a direction to it. Within a layer strong covalent bonds (each c is bonded to 3 other c atoms) Between layers weak forces (c c between layers bond distance is more than twice the c c within a layer bond)