Physical 2 Section 1 - Unit 18: Kinetics
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Explain qualitatively why doubling the temperature has a much greater effect on the rate of the reaction than doubling the concentration of the reactant (3 marks)
• Reaction occurs when molecules have E>Ea • Doubling T by causes many more molecules to have this E • Whereas doubling the concentration only doubles the number with this E
Define rate constant (1 mark)
• A number which allows us to equate rate and concentration OR • The constant of proportionality in the rate expression
Define order of reaction (1 mark)
• The sum of the powers to which the concentrations of all the species involved in the reaction are raised
Rate determining step (1 mark)
Slowest step
What is meant by the term order of reaction with respect to X (1 mark)
Power of concentration term in the rate equation