Mixture A mixture is composed of two or more constituent substances which are not bound together by a chemical bond. Mixtures can occur in each of the states of matter. The composition of the atmosphere is changing gradually over time, due to the burning of fossil fuels and emissions from industry. Mixtures can be found everywhere, as well as air. Mixtures can be found in practically all foods, the soil in the ground, oil and petrol and many other everyday substances.
Alloys are a very important kind of mixture in modern life.
Alloys are made by mixing two or more molten metals uniformly together, and allowing the metal in metal solution to solidify on cooling. Molal concentration is the amount of substance dissolved per unit volume and has units of mol per dm cubed or mol per liter cubed. For example, 0.5M HCl means a hydrochloric acid solution containing 0.5 moles of hydrochloric acid per liter of solution. Mole A mole is the amount of substance which contains as many molecules as are present in 12 grams of Carbon 12. One mole of a compound is its molecular weight in grams.