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Types of Chemical Reactions Chemistry – Day 10. Lesson Outline Types of Chemical Reactions: Types of Chemical Reactions: Synthesis Synthesis Decomposition.

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Presentation on theme: "Types of Chemical Reactions Chemistry – Day 10. Lesson Outline Types of Chemical Reactions: Types of Chemical Reactions: Synthesis Synthesis Decomposition."— Presentation transcript:

1 Types of Chemical Reactions Chemistry – Day 10

2 Lesson Outline Types of Chemical Reactions: Types of Chemical Reactions: Synthesis Synthesis Decomposition Decomposition Single Displacement Single Displacement Double Displacement Double Displacement

3 Chemical Reactions Chemical changes are a result of chemical reactions. All chemical reactions involve a change in substances and a change in energy. Neither matter or energy is created or destroyed in a chemical reaction---only changed. There are so many chemical reactions that it is helpful to classify them into 4 general types which include the following: Chemical changes are a result of chemical reactions. All chemical reactions involve a change in substances and a change in energy. Neither matter or energy is created or destroyed in a chemical reaction---only changed. There are so many chemical reactions that it is helpful to classify them into 4 general types which include the following:

4 Chemical Reactions Synthesis Synthesis Decomposition Decomposition Single Displacement Single Displacement Double Displacement Double Displacement (and we could also include combustion and acid/base reactions) (and we could also include combustion and acid/base reactions)

5 Synthesis Reactions 2 or more simple substances combine to form a more complex substance. 2 or more simple substances combine to form a more complex substance. For example, simple hydrogen gas combined with simple oxygen gas can produce a more complex substance-----water! For example, simple hydrogen gas combined with simple oxygen gas can produce a more complex substance-----water! The chemical equation for this synthesis reaction looks like: reactant + reactant  product A + B  AB The chemical equation for this synthesis reaction looks like: reactant + reactant  product A + B  AB To visualize a synthesis reaction look at the following cartoon: To visualize a synthesis reaction look at the following cartoon:

6 Decomposition Reactions A more complex substance breaks down into its more simple parts. One reactant yields 2 or more products. A more complex substance breaks down into its more simple parts. One reactant yields 2 or more products. For example, water can be broken down into hydrogen gas and oxygen gas. The chemical equation for this decomposition reaction looks like: reactant  product + product For example, water can be broken down into hydrogen gas and oxygen gas. The chemical equation for this decomposition reaction looks like: reactant  product + product AB  A + B To visualize a decomposition reaction look at the following cartoon: To visualize a decomposition reaction look at the following cartoon:

7 Single Displacement Reactions A single uncombined element replaces another in a compound. Two reactants yield two products. A single uncombined element replaces another in a compound. Two reactants yield two products. For example when zinc combines with hydrochloric acid, the zinc replaces hydrogen. The chemical equation for this single replacement reaction looks like: reactant + reactant  product + product For example when zinc combines with hydrochloric acid, the zinc replaces hydrogen. The chemical equation for this single replacement reaction looks like: reactant + reactant  product + product A + BC  B +AC

8 Double Displacement Reactions Parts of two compounds switch places to form two new compounds. Two reactants yield two products. Parts of two compounds switch places to form two new compounds. Two reactants yield two products. For example when silver nitrate combines with sodium chloride, two new compounds--silver chloride and sodium nitrate are formed because the sodium and silver switched places. The chemical equation for this double replacement reaction looks like: reactant + reactant  product + product For example when silver nitrate combines with sodium chloride, two new compounds--silver chloride and sodium nitrate are formed because the sodium and silver switched places. The chemical equation for this double replacement reaction looks like: reactant + reactant  product + product AB + CD  AD + CB


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