How to Use This Worksheet Work in order. Section A checks the definitions and the Maxwell-Boltzmann picture. Section B practises the counting: fractions above Eā, effective collisions per second, and what each change does and does not alter. Section C combines the ideas in exam style. Reference facts used throughout. An effective collision needs energy … Read more
Master AP Chemistry Topic 5.7 with this free practice quiz. Test your skills on multi step reactions, reaction intermediates, and overall reaction equations to prepare for your AP exam. A Mechanism Is a Sequence of Elementary Steps The overall equation of a reaction shows only the net change: which species are consumed and which are … Read more
Reactions Happen in Collisions The collision model explains rates at the particle level. Reactant particles move constantly, and a reaction can only happen when the particles whose bonds must rearrange actually meet: a collision. The rate is set by how many collisions per second succeed, not by the total collisions. Three things decide that count: … Read more
How to Use This Worksheet Work in order. Section A checks the definitions: what an elementary step is, how molecularity is counted, and why termolecular steps are rare. Section B practises writing rate laws for steps and calculating k and rates from them. Section C combines step analysis, mechanisms and rate law matching in exam … Read more
A Single Molecular Event An elementary reaction is a reaction that takes place in one single step, exactly as its equation is written. One molecular event occurs: reactant particles collide, or a single particle breaks apart, and bonds rearrange in that one event, with no hidden sub-steps. Its coefficients count the actual particles involved, not … Read more
How to Use This Worksheet Work in order. Section A checks the three integrated rate laws, the plot each one makes linear, and the half-life expressions. Section B practises using the laws on data and given values of k. Section C combines order identification, slopes, half-lives and predictions in exam style. Reference facts used throughout. … Read more
From a Rate at an Instant to a Concentration at a Time A rate law such as rate = k[A]Ā² gives the rate at one instant, calculated from the concentrations at that instant. It does not directly answer the question an experiment usually asks: how much reactant remains after a given time? The integrated rate … Read more
How to Use This Worksheet Work in order. Section A checks the language of rate laws: orders, the rate constant, and its units. Section B practises the method of initial rates, solving for k, and predicting rates from a rate law. Section C combines those skills in exam style, including a pair of runs in … Read more
The Rate Law: Rate Written in Terms of Concentration A rate law links the rate of a reaction to the reactant concentrations at that moment. For A and B it takes the form rate = k[A]įµ[B]āæ. The square brackets mean concentration in mol/L, written M. The constant k is the rate constant. At a fixed … Read more
How to Use This Worksheet Work in order. Section A checks the definitions, the sign rules and the units. Section B practises average rates from data tables, instantaneous rates from tangents, and converting between species with the coefficients. Section C combines all three in exam style. Reference facts used throughout. Reaction rate = change in … Read more