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 <span>2.blood : mixture</span> <span>3.the oceans : mixture</span> <span>4.iron : pure substance 5.brass : mixture</span> <span>6.uranium : pure substance</span> <span>7.wine : mixture</span> <span>8.leather : mixture</span> <span>9.table salt (NaCl) : pure substance</span>
True, to convert from moles to atoms, multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number (or multiply by its reciprocal).
