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Unit 7, Chapter 21

Unit 7, Chapter 21. Integrated Science. Unit Seven: Changes in Matter. Chapter 21 Types of Reactions. 21.1 Chemical Changes 21.2 Chemical Equations. Chapter 21 Learning Goals. Distinguish between different types of reactions.

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Unit 7, Chapter 21

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  1. Unit 7, Chapter 21 Integrated Science

  2. Unit Seven: Changes in Matter Chapter 21 Types of Reactions • 21.1 Chemical Changes • 21.2 Chemical Equations

  3. Chapter 21 Learning Goals • Distinguish between different types of reactions. • Given the reactants, identify the type of reaction that will occur and predict the products that will be produced. • Analyze energy changes that accompany chemical reactions and classify them as exothermic or endothermic. • Observe reactions of household chemicals to develop a set of rules for precipitate formation. Use these rules to make predictions. • Demonstrate safe practices during laboratory investigations.

  4. exothermic reaction polymerization precipitate reaction insoluble single-displacement reaction Chapter 21 Vocabulary Terms • addition reaction • combustion reaction • decomposition reaction • dissolution reaction • double-displacement • endothermic reaction

  5. 21.1 Classifying Reactions • Being able to recognize the types of reactions will help you predict what types of substances will be produced.

  6. 21.1 Types of Reactions Addition Reaction A + B----->AB Fe (s)+O2 (g)----->Fe2O3 (s) Remember: Fe+ O2 ----->Fe2O3 4 3 2

  7. 21.1 Types of Reactions: Decomposition Reaction AB-----> A+ B 2 H2O(l) -electricity-> 2 H2 (g) + O2 (g) 2 NaHCO3(s) -heat-> 2 H2 (g) + NaCO3 (g)

  8. 21.1 Types of Reactions: Single Displacement Reaction A A + X X B B -----> + Fe Fe + Cu Cu Cl2 -----> + Cl2 -----> +

  9. 21.1 Types of Reactions: Double Displacement Reaction AB +CD --> AC+ BD 2 Pb(NO3)2+ KI--> PbI2+ KNO3 2

  10. 21.1 Types of Reactions: Combustion Reaction CxHy+O2---> CO2+H2O +energy 6 C6H12O6+O2--->CO2+ H2O 6 6

  11. 21.1 Precipitation

  12. Key Question: How can you predict the products of a reaction? 21.1 Classifying Reactions ? *Read text section 21.1 BEFORE Investigation 21.1

  13. Key Question: How can you classify reactions based on energy? 21.2 Energy in Reactions *Read text section 21.2 AFTER Investigation 21.2

  14. 21.2 Energy in Reactions Exothermic reactions produce energy. C6H12O6+O2--->CO2+ H2O + energy 6 6 6 Photosynthesis takes place in the leaves of plants.

  15. 21.2 Energy in Reactions Endothermic reactions require more energy than they produce. 2 Al2O3 (s)+energy--->Al (s)+ O2 (g) 4 3 Aluminum is refined from aluminum ores.

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