By David Bevan
Those overseas A/AS-level technology Revision publications offer exam-focused texts to lead scholars throughout the content material and talents of the path to organize them for his or her AS and A-level tests. every one consultant within the sequence offers: - creation: containing an outline of the direction and the way it truly is assessed, suggestion on revision and taking the exam papers. - content material suggestions: presents a precis of the proof and ideas it is advisable comprehend for the exam. - talents: explains the data-handling abilities it is very important solution a few of the questions within the written papers. It additionally explains the sensible abilities that you'll want as a way to good within the useful exam. - Questions and solutions: features a specimen exam paper that you can attempt, via a collection of student's solutions for every query, with reviews from an examiner that will help you determine precisely what's required within the examination.
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Additional resources for Cambridge International AS and A Level Chemistry: Revision Guide
1, the half-reactions with a high negative E o do not take place readily (think of the reactions of the alkali (Group I) metals with water). By contrast, those with a high positive E o take place spontaneously (think of manganate(VII) as an oxidising agent). The half-equations can be used to construct full chemical equations, by making sure that the numbers of electrons balance and that the overall cell potential is positive. There are some key points that help you to get this right: ●● Write the half-equation with the more negative E o first.
This is the reason that steam produces a much worse ‘burn’ than a small amount of boiling water at the same temperature. 6 ●● metallic 13 Aug 2010 Eleanor Jones To answer questions from this section of the syllabus you need to be able to describe simply a selection of crystalline solids. To do this, it is usually easiest to make a sketch and then add notes. 6). 6 Comparison between a textbook diagram and a simple sketch The notes should focus on the physical properties of the solid in terms of melting point, solubility and conductivity.
Covalent and coordinate (dative) bonding The major difference between ionic (electrovalent) and covalent bonding is that in ionic (electrovalent) bonding electrons are transferred from one element to another to create charged ions, while in covalent bonding the electrons are shared between atoms in pairs. It is important to remember that the electrons do not ‘circle around the nucleus’, but exist in a volume of space surrounding the nucleus where there is a high probability of finding the electron.