1) What type of interaction occurs when two nonpolar molecules are in close proximity a) Dipole-dipole interactions b) Hydrogen bonds c) Van der Waals forces 2) A hydrogen bond is a type of a) covalent interaction b) electronegative interaction c) dipole-dipole interaction 3) Hydrophobic effect results in a) Decrease in hydrophilicity of molecules b) aggregation of non-polar molecules in aqueous solution c) increasing the hydrophobicity of molecules 4) Rank by energies (from lowest to highest): a. C=C bond b. hydrogen bond. c. ionic bond a) b,c,a b) a,b,c c) a,c,b d) c,b,a 5) dipole-dipole interactions are a) weak attractive forces b) repulsive forces c) neither attractive nor repusive forces 6) van der Waals energies are usually computed for a) adjacent atoms b) atoms that are connected by no less than two atoms c) atoms whose van der Waal radii are in contact 7) London forces are a) strong interactions that maintain the structure of the molecule b) weak interactions formed when non-polar groups come together c) caused by random fluctuations of electron densities 8) Salt dissolving in water through a) ionic bonds b) cation-pi interactions c) hydrophobic effect d) ion-dipole interactions 9) Which of these is not a property of hydrogen bonds? a) strong covalent-like interactions b) directional c) resonance d) cooperativity 10) Electrostatic interactions are a) Only found in polar covalent compounds b) Forces between charged particles c) A form of hydrogen bonding d) Weak interactions between nonpolar molecules

Molecular Interactions

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