A mixture of lipids is applied to a silica gel column and the column is washed with increasingly polar solvents. The mixture consists of phosphatidylserine, phosphatidylethanolamine, phosphatidylcholine, cholesteryl palmitate (a steryl ester), sphingomyelin, palmitate, n-tetradecanol, triacylglycerol, and cholesterol. In what order will the lipids elute from the column from the first to elute from the column to the last

Explanation:

Silica gel is polar, therefore the non-polar (hydrophobic) lipids will elute first whereas the polar (hydrophilic) lipids will elute later. In the given lipid sample the order from non-polar to polar is:

triacylglycerol, cholesterol, sphingomyelin, phosphatidylserine.

Hence the order of elution from the first to the last will also be the same. i.e,triacylglycerol( elutes1st), cholesterol, sphingomylein, phosphatidylserine (elutes last).

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.