BIO 151 Lecture Notes - Lecture 5: Hydrophile, Sodium Hydroxide
Document Summary
Molecules of life: basic chemistry, chemical bonds, water, biomolecules (i. e. structure, function) Life is a series of chemical reactions: breaking down, building. Atoms: (cid:373)allest (cid:862)(cid:271)uildi(cid:374)g (cid:271)lo(cid:272)ks(cid:863)/u(cid:374)its, units of matter. Subatomic particles: protons: in nucleus- positive charge, neutrons: in nucleus- negative charge, electrons: outside nucleus- no charge, charge can be individual or overall. Formation of chemical bonds: compounds: electrons. *covalent is strongest because they cannot be broken apart easily. *form bonds to make atoms more stable- should be balanced like this: 2-8-8: reactive= unstable, non reactive= stable. Radon gas: uranium radon, unstable, radiation emitting (energy, 1 in 5 homes in the u. s, 21,000 deaths each year, radon test kits-only way to know if you have it, it is controllable! Covalent bonds: electrons shared equally or unequally, polar- unequal sharing-charged, nonpolar- share equally- no charge. Ionic bonds: charged atoms, transfer of electrons, ion. Hydrogen bonds: water, dna- 3d molecular shape, proteins, purpose of bonding: stability, weakest bond.
