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Grade 7 Science Unit 3: Mixtures & Solutions: The Particle Theory Particle Theory of Matter All matter is made up of tiny particles. These particles are always moving… they have energy. There are spaces among particles. There are attractive forces between the particles. The particles of one substance differ from the particles of other substances. Student Activity... With a partner decide: 1. How would you tell the difference between a pure substance and a mixture? 2. How would use the Particle Theory of Matter to support your answer to question #1? Mixtures vs. Pure Substances Mixtures... MAY have distinct visible components. MAY appear uniform throughout. They are the physical combination of two or more pure substances. + Sugar = Water ? Examples of Mixtures… •salt water, kool-aid •chocolate chip cookie •muddy water •salad dressing •air Pure Substances... ALWAYS appear as uniform throughout They contain either a single atom or two or more atoms chemically combined to form a different substance. Examples of Pure Substances •sugar (C12H22O11) •gold (Au), copper (Cu) •distilled water (H2O) •carbon dioxide (CO2) •oxygen (O2) Student Activity... Read pages 232, 236 and 237 Make a list of 15-20 solutions and mixtures that you encounter in a day. * those that may pose a safety risk.