BSC 2010 Lecture Notes - Lecture 3: Cell Nucleus, Hydrolysis, Surface Tension

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2010
• Professor: Jennie Demarco

Document Summary

Element: pure substance that contains only one kind of atom. ~ number of protons = atomic number electrical neutrality: protons = electrons. ~ mass number is the number of protons plus neutrons. Bohr model: atom is largely empty space, the electrons occur in orbits, or electron chains. Hydrogen bond: attraction between h+ and a strongly electronegative atom. Hydrophobic interaction: interaction of non polar substances in the presence of polar substances. (especially water) Van der waals interaction: interaction of electrons of non polar substances. Orientation: length, angle, and direction of bonds between any two elements are always the same. a) example: methane always forms a tetrahedron. Strength and stability: covalent bonds are very strong; it takes a lot of energy to break them . Multiple bonds a) single sharing 1 pair of electrons. b)double 2sharing 2 pairs of electrons. c) triple sharing 3 pairs of electrons. ~ greatest difference in electronegativity = higher polarity.