[Catalist] Equilibrium and temperature

[Tania Stafford]

The mechanics behind this are quite complex and students don’t really get into it until studying chemistry at university. That is why Le Chetalier’s principle is used often to explain temperature change rather than collision theory and enthalpy. Your standard answer is all that expected in the ATAR papers.
Tania

From: Catalist <catalist-bounces at lists.stawa.net<mailto:catalist-bounces at lists.stawa.net>> on behalf of Andrew Bland <abl at gmas.wa.edu.au<mailto:abl at gmas.wa.edu.au>>
Reply-To: "catalist at lists.stawa.net<mailto:catalist at lists.stawa.net>" <Catalist at lists.stawa.net<mailto:Catalist at lists.stawa.net>>
Date: Friday, 24 November 2017 at 12:11 pm
To: "Catalist at lists.stawa.net<mailto:Catalist at lists.stawa.net>" <Catalist at lists.stawa.net<mailto:Catalist at lists.stawa.net>>
Subject: [Catalist] Equilibrium and temperature

Dear chemistry teachers,

When a system is heated, both the forward and reverse reaction rates increase, “but the endothermic reaction increases more than the exothermic reaction. The endothermic reaction is always affected more by a temperature change than the exothermic reaction. This is true even when a system is cooled…” Chem for WA 2.

My question is why is the endothermic reaction rate always effected more than the exothermic rate? I cannot find an explanation in any of my texts, only a re-stating of this in various forms.

Thanks

Andrew




Andrew Bland
Head of Year 10 and Head of Geographe House

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