A mixture is a system that is made up of two or more substances which are not combined chemically. A pure substance is a system that only has one substance. The following are classified as: 1.water : pure substance 2.blood : mixture 3.the oceans : mixture 4.iron : pure substance 5.brass : mixture 6.uranium : pure substance 7.wine : mixture 8.leather : mixture 9.table salt (NaCl) : pure substance
