As a physical combination one should be able to separate these substances from the mixture by physical methods so that no Chemical change can take place during the separation.
(one; should be; able to separate these substances from the mixture by physical methods) (one; to separate; these substances; from the mixture) (no Chemical change; can take; place; T:during the separation)
one one no Chemical change
should be to separate can take
able to separate these substances from the mixture by physical methods
these substances from the mixture
place T:during the separation