8303125-044-Rate-Expression-Orders - Chem Factsheet January...

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Experimental methods for rates of reactions 1. Reactions producing gases Examples are: CaCO 3 (aq) + 2HCl(aq) CaCl 2 (aq) + H 2 O(l) + CO 2 (g) 2H 2 O 2 (aq) 2H 2 O(l) + O 2 (g) Mg(s) + 2HCl(aq) MgCl 2 (aq) + H 2 (g) Equipment – gas syringe Volume of gas collected in the syringe is measured at set time intervals Graph produced The gradient at zero time is the initial rate Rate Expression Orders and Experimental Procedures C hem F actsheet January 2003 Number 44 1 To succeed with this topic you need to: ensure you are fully competent in writing rate expressions from the experimental data provided (Factsheet No.43 (Kinetics II)). After working through this Factsheet you will be able to: recognise which experimental techniques are available to provide ‘initial rate’ data for rates of reactions; know how particular graph plots provide information about orders of reactions; use the data from first order reactions to find half-lives. Exam Hint : - To be able to answer questions in the examination and experimental procedures you need to be able to do the following things: (1) use state symbols from the chemical equation provided (2) use your own knowledge from your laboratory work about some chemicals ( colours particularly) (3) remember the procedures that are given below volume/cm 3 time/s 0 b a 2. Reactions where there is a colour change Examples are, 2MnO 4 (aq) + 16H
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This note was uploaded on 03/08/2011 for the course CHEM 101 taught by Professor Hard during the Spring '11 term at UT Arlington.

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8303125-044-Rate-Expression-Orders - Chem Factsheet January...

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