Those pursuing their interests into specific areas of chemistry communicate with others who share the same interests.
I know from feedback that my gcse science summary revision pages have proved useful but they do not guarantee a high grade, that all depends on you and the factors mentioned in point 4. Please note that my GCSE science revision pages are designed to be used for online convenience, so, beware, printouts could be quite long!
Some quizzes, particularly the compilations, are quite large and take some time to download. Links to specific GCSE chemistry notes and quizzes about the topic in question have been added, and from these pages, you may find other links to more useful material linked to the topic.
In terms of old grades the following is an approximate comparison: Chemistry Paper 2 this page What's assessed in this paper?
Chemistry Paper 4, Topic 13 "The rate and extent of chemical change" Appreciate that chemical reactions can occur at vastly different rates. Whilst the reactivity of chemicals is a significant factor in how fast chemical reactions proceed, there are many variables that can be manipulated in order to speed them up or slow them down.
Chemical reactions may also be reversible and therefore the effect of different variables needs to be established in order to identify how to maximise the yield of desired product.
Understanding energy changes that accompany chemical reactions is important for this process. In industry, chemists and chemical engineers determine the effect of different variables on reaction rate and yield of product.
Whilst there may be compromises to be made, they carry out optimisation processes to ensure that enough product is produced within a sufficient time, and in an energy efficient way.
Factors affecting the rate of a chemical reaction - temperature, concentration, particle size, catalysts etc. Chemistry Paper 4, Topic 13 "The rate and extent of chemical change" 6. You should be able to: In the context of rates of reaction data, you must be able to Recognise and use expressions in decimal form.
Use ratios, fractions and percentages. Make estimates of the results of simple calculations. Translate information between graphical and numeric form. Plot two variables from experimental or other data.
Determine the slope and intercept of a linear graph.
Draw and use the slope of a tangent to a curve as a measure of rate of change.TOPIC 5 RATE OF REACTION ILLUSTRATIVE EXPERIMENTS • Keep demonstration simple and eye catching • Do not overlook simple demonstrations. Even trivial activities can spark all . In every chemical reaction, there are participants known as reactants, which, by chemically reacting to one another, result in the creation of a product or products.
As stated earlier, a chemical reaction involves changes in the arrangement of atoms. The atoms in the reactants (or, if the reactant. The mechanism of a chemical reaction is the sequence of actual events that take place as reactant molecules are converted into products. Each of these events constitutes an elementary step that can be represented as a coming-together of discrete particles ("collison") or as the breaking-up of a molecule ("dissociation") into simpler units.
The molecular entity that emerges from each step may.
We could integrate the combined mole balance and rate law to plot reaction rate data in terms of concentration vs. time for 0, 1st, and 2nd order reactions. Table CD - Derivation Equations used to Plot 0, 1st, and 2nd order reactions.
Investigating rates of chemical reactions. In this lesson, students will investigate the factors that affect the rate of chemical reaction between hydrochloric acid and sodium thiosulphate solution. The reaction rates are the key information required to quantify chemical reactions and to describe the performance of chemical reactors.
The specific rate of a single reaction in which N components are involved is defined; for details, see Levenspiel () and Westerterp et al. ().