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Chapter 2: Common Reactions in Our Lives

Chapter 2: Common Reactions in Our Lives. Unit A: Matter and Chemical Change. 2.1 Useful Reactions. During a chemical reaction , substance react to produce new substances with different properties from the original substances. What are some examples of chemical reactions?.

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Chapter 2: Common Reactions in Our Lives

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  1. Chapter 2: Common Reactions in Our Lives Unit A: Matter and Chemical Change

  2. 2.1 Useful Reactions • During a chemical reaction, substance react to produce new substances with different properties from the original substances. • What are some examples of chemical reactions?

  3. 2.2 The Changes That Occur • Some chemical reactions require energy, while some produce energy. • The substances you start with are not the same as the substances you end up with.. • There are several indicators that may occur after some chemical reactions. • One sign is the release or absorption of energy Reactants Products

  4. 2.2 The Changes That Occur • Combustion Reaction • Neutralization Reaction Magnesium hydroxide reacts with hydrochloric acid to produce magnesium chloride. Neutralization Reaction

  5. 2.3 Evidence That Change Has Occurred • A different color is produced • An odour can be detected • Bubbles appear or a gas forms • A solid that forms during a chemical readtion is called a precipitate • Energy is given off in some form or absorbed • Light • Heat • Sound

  6. 2.4 Energy and Chemical Reactions • An energy change is an obvious or unnoticeable production or absorption of a form of energy as a part of a chemical change. • An endothermic reaction is any chemical reaction that absorbs heat. • An exothermic reaction is any chemical reaction that releases heat

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