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Transcript
Lesson 2.4: Combustion Reactions In some areas of the Arctic, large amounts of methane, CH4 (g) are entering the atmosphere. Where is it coming from? As the climate becomes warmer and the ground thaws bacteria produce methane from the remains of dead plants and animals. How do scientists find the methane in the arctic? Digging a hole and igniting the gas (easier done over a lake). Methane is a hydrocarbon, a compound that is composed only of the elements carbon and hydrogen. The combustion of hydrocarbons can be either complete or incomplete. Complete Combustion Methane: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O(g) General Hydrocarbon: CxHy + 2O2 (g) → CO2 (g) + 2H2O(g) Hydrocarbons and their uses: Incomplete Combustion To have the complete combustion, the correct amount of oxygen is required. If there is too little oxygen, then incomplete combustion occurs. Incomplete combustion of propane: 2C3H8 (g) + 7O2 (g) → 2C(s) + 2CO(g)+ 2CO2 (g) + 8H2O(g) What is the product in this reaction that can cause deposits of a dark substance to form on nearby surfaces? Soot: fine particles consisting mostly of carbon Ex #1: What is the balanced chemical equation for the complete combustion of butane? 2C4H10 (g) + 13O2 (g) → 8CO2 (g) + 10H2O(g) Ex. #2: Write a balanced chemical equation for the incomplete combustion of hexane, C6H14 (l). C6H14 (g) + 5O2 (g) → 4C(s) + CO(g)+ CO2 (g) + 7H2O(g) EX #3: Write the combustion reaction of glucose. C6H1206 (g) + 6O2 (g) → 6CO2 (g) + 6H2O(g)