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Types of Chemical Reactions

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Presentation on theme: "Types of Chemical Reactions"— Presentation transcript:

1 Types of Chemical Reactions

2 Five Types of Chemical Reactions
Remember…a chemical reaction is when one compound is changed into a totally different compound. While there are millions of different types of reactions, they can all be classified into five general types.

3 Five Types of Chemical Reactions
The five types are: Synthesis Decomposition Single Replacement Double replacement Combustion

4 Synthesis Reaction A synthesis reaction takes place when two or more chemicals react to produce a single chemical. The reactants can be either elements or molecules (the product is always a molecule). A + B AB

5 Synthesis Reaction Actual example: 2Na + Cl2 → 2NaCl

6 Practical use – the synthesis of nylon
Synthesis Reaction Practical use – the synthesis of nylon A key ingredient in toothbrushes, tents, carpet, clothes, guitar strings…

7 Decomposition Reaction
A decomposition reaction takes place when a molecule breaks down into two or more substances. The reactant is always a molecule (never a single element). AB A + B

8 Decomposition Reaction
An actual example: H2CO3 → H2O + CO2

9 Decomposition Reaction
Practical use – car airbags The rapid decomposition of sodium azide causes the bag to inflate with nitrogen gas in about seconds!

10 Single Replacement Reaction
A single replacement reaction takes place when one element takes the place of another element in a molecule. The reactant side always consists of an element and a molecule. A +BC B + AC

11 Single Replacement Reaction
An actual example: 2Na + 2H2O → 2NaOH + H2

12 Double Replacement Reaction
A double replacement takes place when two molecules exchange elements. There are at least two molecules on both sides of the arrow. AB + CD AD + BC

13 Double Replacement REaction
An actual example: CaCO3 + 2HCl → CaCl2 + H2CO3

14 Combustion Reaction A combustion reaction takes place when a hydrocarbon reacts rapidly with oxygen gas. A hydrocarbon is a molecule made of carbon and hydrogen atoms. The products are CO2 and H2O. CH + O CO2 + H2O

15 Combustion Reaction An actual example: CH4 + 2O2 → CO2 + 2H2O

16 Practical use – internal combustion engine
Combustion Reaction Practical use – internal combustion engine Most forms of transportation use this type of engine.

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