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ENERGETICS_Part_1_AHL(MAH) Opp

ENERGETICS_Part_1_AHL(MAH) Opp - 100s of free ppts from...

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Topic 15: Energetics AHL Part 1 15.1 Standard Enthalpy Changes of Reaction (1.5h) 15.1.1 Define and apply the terms standard state, standard enthalpy change of formation ∆H f Θ and standard enthalpy change of combustion ∆H c Θ 15.1.2 Determine the enthalpy change of a reaction using standard enthalpy changes of formation and combustion
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Learning check What are the three standard conditions? What is the standard state of bromine? What is the standard state of silicon? What is the standard state of oxygen? The standard enthalpy change of formation ∆H f Θ of a compound is defined as the amount of energy exchanged with the surroundings when 1 mole of the compound is formed from its elements in their standard states under standard condition .
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Write chemical equations for the following reactions – which have ∆H f Θ as their enthalpy change – including all state symbols The formation of sodium chloride The formation of magnesium oxide The formation of methane The formation of sulphur dioxide. The formation of carbon dioxide
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ΔH c θ The standard enthalpy change of combustion ∆H c Θ is defined as the amount of energy given to the surroundings when 1 mole of a compound undergoes complete combustion
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Write chemical equations for the following reactions – which have ∆H c Θ as their enthalpy change – including all state symbols. The combustion of methane The combustion of graphite The combustion of ethanol Extension: Which chemical equation shows both the enthalpy change of formation of a compound and the enthalpy change of combustion of an element?
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HESS’S LAW According to the German scientist Hess, the total enthalpy change for a chemical reaction is independent of the route by which the reaction takes place. Explain why Hess’s Law is just a specific case of the Law of Conservation of Energy.
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