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Chemical Reactions If you add two substances together sometimes you get a chemical reaction. This is when a new substance is made. It is very difficult to reverse the reaction and get the original substances back. Signs that a chemical reaction has taken place include a change in colour, heat being given off or bubbles of gas being made. Adding acid to Fireworks Driving a car alkali Ice cream Boiling the kettle frying an egg melting x x Burning a candle Melting Dissolving sugar Discuss in pairs which of these are candle wax in tea The changes that are not chemical chemical reactions x x changes are called physical changes Lighting a match Making Ironing ice cubes clothes x x Printing Baking a cake Launching a space rocket x Objectives Define and give general equations for synthesis, decomposition, single- replacement, and double-replacement reactions. Classify a reaction as synthesis, decomposition, single-replacement, single-replacement, double- replacement, or combustion. 4 Objectives List three types of synthesis reactions and six types of decomposition reactions. List four types of single-replacement reactions and three types of double- replacement reactions. Predict the products of single reactions given the reactants. 5 Background Thousands of known chemical reactions occur in various systems. Memorizing the equations for so many chemical reactions would be difficult. It is more useful and realistic to classify reactions according to various similarities and regularities. 6
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