BRAINCAKERate of Reaction
Revision notes for Rate of Reaction in OCR Chemistry A (H432). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- The Rate of a ReactionThe rate of a chemical reaction measures how fast reactants are being used up or how fast products are being formed.
- Measuring Reaction RatesKnowing how fast a reaction proceeds is essential in designing manufacturing plants or considering the economics of industrial processes.
- Experimental Determination of the Rate of ReactionTitrations can be used to work out the concentration of reactants or products as the reaction progresses.
- The Rate EquationParticles only react if they have sufficient energy.
- The Order of a ReactionThe order of a reaction with respect to a reactant is the power to which the concentration of the reactant is raised in the rate equation.
- The Rate Constant kThe rate of reaction depends on both the rate constant and the concentration of the reactants e.g. rate = k [NO] 2 [O2] The larger the value of k…
- Worked ExampleExperiments are carried out to investigate the kinetics (rate of reaction) of three compounds A, B and C that react together.
- Half-Lives and Reaction Rate GraphsThe half-life of a reactant is the time taken for the concentration of a reactant to reduce by half.
- The Rate Determining StepChemical reactions often take place in a series of steps called the reaction mechanism.
- CatalystsHomogenous Catalysts are in the same physical state as the reactants.
- The Effect of Temperature and Catalysts on the Rate Constant.The value of the rate constant depends on the orientation factor, activation energy and temperature.