Peptides can be separated using an ionâexchange column based on their isoelectric (pi) values. at which ph values would two different peptides, one with a pi of and the other with a pi of , bind to a cationâ and anionâexchange column? each peptide may be capable of binding to each column at more than one ph value.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the answer your looking for is c).