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Chemical Reactions Unit 4

Chemical Reactions Unit 4. Mrs. Brostrom Integrated Science. Forming New Substances. A chemical reaction is a process in which one or more substances to make one or more new substances Chemical and physical properties differ from the original substance

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Chemical Reactions Unit 4

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  1. Chemical ReactionsUnit 4 Mrs. Brostrom Integrated Science

  2. Forming New Substances • A chemical reaction is a process in which one or more substances to make one or more new substances • Chemical and physical properties differ from the original substance • For example: mixing baking powder and water form CO2 and give muffins there sponge-like texture

  3. How can you tell that a chemical reaction is taking place? • Gas formation • Solid formation- a precipitate is a solid substance that is formed in a solution • Energy exchange- energy is released as light or heat or energy can be absorbed • Color change

  4. The Sugar Snake • However, these signs do not guarantee a chemical reaction is taking place • The most important sign is the formation of new substances that have different properties • For example, combining sugar and sulfuric acid; bubbles form, a gas is given off, and the beaker becomes hot • But most important, a new substance is formed with different properties

  5. Breaking and Making Bonds • A chemical bond is a force that holds two atoms together in a molecule • For a chemical reaction to take place, the original bond must break and new bonds must form • If molecules bump into each other with enough energy • The chemical bond breaks • The atoms rearrange to make new substances

  6. New Bonds Make New Substances • Sodium is a metal that reacts violently in water • Chlorine gas is poisonous • But when Na and Cl react, they result in a new substance, NaCl or salt • Salt is a harmless substance with very different properties + 

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