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Chemical Reactions

Chemical Reactions. What is it??. A chemical reaction is a process by which chemical change happens. ALL result in changes in energy. There are 4 different types. Synthesis Reactions. Two elements combine to form a compound. Can either be: 1) metal + non-metal or

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Chemical Reactions

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  1. Chemical Reactions

  2. What is it?? • A chemical reaction is a process by which chemical change happens. • ALL result in changes in energy. • There are 4 different types

  3. Synthesis Reactions • Two elements combine to form a compound. • Can either be: 1) metal + non-metal or 2) non-metal + non-metal • A general statement: element + element ---> compound • The general chemical equation: A + B ---> AB

  4. Examples + A + B ---> AB

  5. Examples • Hydrogen gas + Nitrogen gas ---> Ammonia • Skeleton equation: H2+ N2 ---> NH3 • Balanced equation: 3H2 + N2 ---> 2NH3 • Sulphur + Oxygen ---> Sulphur dioxide • Skeleton equation: S8 + O2 ---> SO2 • Balanced equation: S8 + 8O2---> 8SO2

  6. Decomposition Reactions • A compound is broken apart into two elements. • Reverse of a synthesis reaction. • A general statement: compound ---> element + element • The general chemical equation: AB ---> A + B

  7. Examples + AB ---> A + B

  8. Examples • Water ---> Hydrogen + Oxygen • Skeleton equation: H2O ---> H2 + O2 • Balanced equation: 2H2O ---> 2H2 + O2 • Mercury(II) Oxide ---> Mercury + Oxygen • Skeleton equation: HgO ---> Hg + O2 • Balanced equation: 2HgO ---> 2Hg + O2

  9. Single Displacement • An element replaces another element to form a new compound • reactants = compound + non-metal • products = compound + non-metal • The general chemical equation: AB + C ---> AC + B

  10. Examples AB + C ---> AC + B • Potassium iodide and bromine • SE: KI + Br2 ---> KBr + I2 • BE: 2KI + Br2 ---> 2KBr + I2

  11. Double Displacement • Elements in different compounds replace each other • The general chemical equation: AB + CD ---> AD + CB

  12. Examples AB + CD ---> AD + CB • Magnesium hydroxide and Silver nitrate • SE: Mg(OH)2+ AgNO3 ---> Mg(NO3)2 + AgOH • BE: Mg(OH)2 + 2AgNO3 ---> Mg(NO3)2 + 2AgOH

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