BCH210H1 Chapter Notes -Freezing-Point Depression, Vapor Pressure, Micelle

• School: UTSG
• Department: Biochemistry
• Course: BCH210H1
• Professor: Stavroula Andreopoulos

Document Summary

Properties of water intermolecular forces between water molecules are high. High boiling point, melting point, heat of vaporization, surface tension. Negative volume of melting two hydrogen atoms are covalently linked to oxygen, each sharing an electron pair in a bent configuration. Bent structure influences its properties creates a dipole that renders water polar. Mutual reinforcement of hydrogen bonding hydrogen bonded water molecule acceptor is a better donor than an unbonded water molecule. Hydrogen bonds (23 kj/mol) are weak compared to h-o covalent bonds (420 kj/mol) always clear which are chemically bonded and which are hydrogen bonded. Hydrogen bonds form space-filling, three dimensional network. Hydrogen atom lies on a direct line between two oxygen atoms linearity and directionality means that the hydrogen bonds on ice are strong. Directionality leads to open lattice structure density of ice only 57% of expected hydrogen bonds of ice hold water molecules apart. Hydrogen bonds in water last ~9. 3 seconds.