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Types of Chemical Reactions: Combustion & Corrosion

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Presentation on theme: "Types of Chemical Reactions: Combustion & Corrosion"— Presentation transcript:

1 Types of Chemical Reactions: Combustion & Corrosion

2 Combustion when a fuel reacts quickly with oxygen
produces oxides and energy important source of fuel is hydrocarbons

3 Complete Combustion of Hydrocarbons
if lots of oxygen is available, complete combustion produces carbon dioxide and water hydrocarbon + oxygen  carbon dioxide + water + energy CxHy + O2  CO2 + H2O + energy Example Complete combustion of butane (C4H10):  2 C4H10(g) O2(g)  8 CO2(g) H2O(g) + energy 

4 Incomplete Combustion of Hydrocarbons
if oxygen supply is limited produces carbon monoxide gas, carbon (soot), plus carbon dioxide and water orange flames are often present Example C4H10(g) + 5 O2(g)  2 CO2(g) H2O(g) + CO(g) + C(s) + energy

5 Other Types of Combustion
other substance react with oxygen forms oxides General word equation: element + oxygen  oxide + energy General chemical equation: A O2  AO + energy Example: Mg(s) + O2(g)  2MgO(s) + energy video clip

6 Corrosion breakdown of a metal, due to a reaction with chemicals in the environment common example?

7 Rust corrosion of iron reaction with oxygen and water
electrolytes act as a catalyst can prevent with paint or plastic coating

8 4 Al(s) + 3 O2(g)  2 Al2O3(s) + energy
Beneficial Corrosion Sometimes corrosion of some metals forms a tough protective layer that prevents further corrosion For example, Aluminum:  4 Al(s) O2(g)  2 Al2O3(s) + energy

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