Chem 210 Exam 1 Questions & Answers(Graded A)

Intermolecular forces - ANSWER- non bonding forces - found BETWEEN molecules - influence the energy physical properties of the substances Physical properties examples - ANSWERboiling point, melting point, solubility, color, odor, etc. T/F: stronger intermolecular forces correlate to a higher boiling point - ANSWERTrue Kinetic energy - ANSWER- provides the energy needed to overcome intermolecular forces What is kinetic energy associated with? - ANSWERThe random motion of particles KE is proportional to... - ANSWERTemperature Solid to liquid - ANSWERMelting Liquid to gas - ANSWERVaporization Gas to liquid - ANSWERCondensation Liquid to solid - ANSWERFreezing T/F: the stronger the IMFs, the less energy is required - ANSWERFalse Solid to gas - ANSWERSublimation Gas to solid - ANSWERdeposition Intramolecular forces - ANSWER- bonding forces WITHIN a molecule - influence the CHEMICAL properties of the substance T/F: Intramolecular forces are stronger than intermolecular forces - ANSWERTrue London dispersion forces - ANSWER- arise when instantaneous dipole in one particle induces a dipole in another, resulting in an attraction between them - weak - always present Dipole - ANSWERUneven distribution of electrons within a molecule LDF trends - ANSWER- Larger atoms/particles (more electrons) experience stronger dispersion forces - larger electron cloud can be more easily distorted T/F: molecular shape has no effect on dispersion forces - ANSWERFalse Surface area and LDF's - ANSWERMolecule with larger surface area has stronger