Ion exchange chromatography is a commonly used method for separation of biomolecules. In what order would Arg, Val, and Glu elute from a carboxymethyl column at pH 6.0. Carboxymethyl is negatively charged at pH 6.0. a. Glu, Val, Arg b. Arg, Val, Glu c. Val, Glu, Arg d. Glu, Arg, Val

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.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.