Mixtures <ul><li>By the end of the lesson you should be able to: </li></ul><ul><li>Describe a composite material and give an example of one </li></ul><ul><li>Describe the difference between a solution and suspension </li></ul><ul><li>Explain what a colloid is and give examples </li></ul>
Types of mixtures Hairspray Salad dressing Hair gel Shaving foam Milk of Magnesia Salty water Example Liquid dispersed in a gas Aerosol Liquid dispersed in a liquid Emulsion Liquid dispersed in a solid Gel Gas dispersed in a liquid Foam A fine powder mixed with a liquid but not dissolved Suspension A substance that has dissolved in something else Solution What is it? Name
Colloids Aerosols, foams, gels and emulsions are all colloids. A colloid is a mixture in which one substance is mixed as fine drops or bubbles in another substance. Bubbles of gas Liquid A foam is gas bubbles in a liquid
Composites In a way composite materials are mixtures. They are mixtures of different materials. An example is reinforced concrete. It is a mixture of concrete and steel mesh. By combining two materials to make a composite you can often get the benefit of the properties of both.
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