Which statement is true for London dispersion forces? A. At any given point in time, a partial charge called an instantaneous dipole can form in a molecule, producing a repulsion between neighboring molecules.

B. Larger atoms require lower boiling points than smaller atoms to overcome the strong intermolecular attraction.

C. The attraction between induced dipole–instantaneous dipole pairs is very strong and permanent.

D. The strength of intermolecular attractive forces is greater in larger molecules than in smaller molecules.

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Which of the following contributes to the structural rigidity of cellulose? adjacent glucose polymers are stabilized by hydrogen bonding. glucose residues are joined by (α1→4) linkages. cellulose is a highly branched molecule. the conformation of the glucose polymer is a coiled structure.

How does a noncompetitive inhibitor reduce an enzyme’s activity?