If a substance cannot be separated physically and is also cannot be chemically separated, what is the substance? Use the chart below to help you answer.

matter
can it be separated physically?
yes or no
pure substance
can it be chemically separated?
yes or no
mixture
is the mixture the same throughout?
yes or no

The substance is a pure substance. It cannot be separated physically and also cannot be chemically separated. The mixture is the same throughout.