Flashcards
Reaction rates
Cards in this deck (12)
- 1Activation energythe minimum energy which particles need to collide to start a reaction
- 2Effect of Increasing Concentration and Increasing PressureAt 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. - 3Na2S2O3 + 2HCl measuring rate2NaCl + SO2 + S + H2O
1/time
time is t for X placed underneath the reaction mixture to disappear due
to the cloudiness of the Sulphur - 4Why 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. - 5Effect of catalystProvide an alternative route or mechanism with a lower activation energy so
more molecules have energy above activation energy - 6Heterogeneous catalysis (3)Usually solids.
Reactants are gaseous or in
solution.
The reaction occurs at the surface of the catalyst. - 7Homogeneous catalysisSame state
Forms intermediate - 8Methods of measuring rateChange in volume of gas
Measurement of change of mass
Colorimetry - 9Change in volume of gasThis works if there is a change in the number of moles of gas in the reaction.
- 10Calculating IRTangent at t=0
Y/X cm3s-1 - 11Labelling axis of Boltzmann curveFraction of molecules
with energy
Collision energy - 12Effect of Increasing TemperatureIncreasing surface area will cause collisions to occur more frequently between the reactant particles
This increases the rate of the reaction.
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- User has deleted their subject information Flashcards on Reaction rates, created by Deleted user on 28/04/2018.
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- Deleted user · Apr 2018
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- Apr 28, 2018
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- Created by I Shouldn't be awake · Apr 28, 2018
- Copied by I Shouldn't be awake · Apr 28, 2018
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