BIOL 112 Lecture Notes - Lecture 1: Nonmetal, Ammonia, Acid Strength

• School: McGill University
• Department: Biology
• Course: BIOL 112
• Professor: Lucy- Ann Joseph

Document Summary

Atomic # gives identity of element corresponding to # of protons. Protons + neutrons (decimal bc it"s a weighted avg of all isotopes) Same element with same # of protons but different # of neutrons; radioactive; have shorter half lives; have same chemical properties; used as traces for c dating. 2 or more atoms linked together through chemical bond (formed by electron) O more electronegative than h (partial charges exist) In unequal sharing, electrons spends more time around nucleus of atom with higher en. Water is polar ; h bonds form bw water molecules. Polarity formed by dipoles due to different electronegative. Polar molecules (n,o,f) with h can form h bonds. Forms where water meets solid surface, result of 2 forces. Cohesion water molecules experience net downward pull from h bonds with h2o molecules below. Metal loses electrons from outermost shell, gives to non-metal. Water forces nonpolar molecules together bc hydrophobic molecules want to minimize amount of h bonding.