Reaction rates

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Flashcards on Reaction rates, created by I Shouldn't be awake on 28/04/2018.
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Flashcards by I Shouldn't be awake, updated more than 1 year ago
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Created by I Shouldn't be awake over 6 years ago
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Question Answer
Activation energy the minimum energy which particles need to collide to start a reaction
Effect of Increasing Concentration and Increasing Pressure At higher conc. and P there are more particles per unit volume Particles collide with a greater frequency there will be a higher frequency of effective collisions.
Na2S2O3 + 2HCl measuring rate 2NaCl + SO2 + S + H2O 1/time time is t for X placed underneath the reaction mixture to disappear due to the cloudiness of the Sulphur
Why is this an approximation? it does not include concentration. We can use this because we can assume the amount of Sulphur produced is fixed and constant.
Effect of catalyst Provide an alternative route or mechanism with a lower activation energy so more molecules have energy above activation energy
Heterogeneous catalysis (3) Usually solids. Reactants are gaseous or in solution. The reaction occurs at the surface of the catalyst.
Homogeneous catalysis Same state Forms intermediate
Methods of measuring rate Change in volume of gas Measurement of change of mass Colorimetry
Change in volume of gas This works if there is a change in the number of moles of gas in the reaction.
Calculating IR Tangent at t=0 Y/X cm3s-1
Labelling axis of Boltzmann curve Fraction of molecules with energy Collision energy
Effect of Increasing Temperature Increasing surface area will cause collisions to occur more frequently between the reactant particles This increases the rate of the reaction.
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