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Chromatography

Chromatography

Chemistry A Level organic analysis
Genetic fingerprinting chromatogram
Chromatography gets its name from the (sometimes) colourful chromatograms it produces.

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Refraction and reflection

Refraction and reflection

GCSE Physics
Sidney Opera house through a wineglass

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Extending the Carbon Chain (OCR)

Extending the Carbon Chain (OCR)

Chemistry A Level organic chemistry

Enter your text here ... Enter your text here ... Enter your text here ... Enter your text here ... Enter your text here ... Enter your text here ... Sometimes in organic synthesis there is a need to extend the length of a carbon chain . This can be achieved in a few different ways: 

The Halogens

The Halogens

IGCSE Chemistry
Three of the halogens: Chlorine - a green gas, Bromine - and orange brown liquid, Iodine - a silvery grey solid

Enter your text here ... The halogens are a family of elements in group 7 (aka 17) of the periodic table. in this video, you can see how reactive the halogens can be. you can also see the characteristic colours of: ​​​chlorine; a pale green gasbromine; a volatile orange-brown liquid.iodine; a shiny grey metallic-looking solid with a ...

NMR Spectroscopy

NMR Spectroscopy

Chemistry A Level organic analysis
The NMR facility at Princeton University
The NMR facility at Princeton University

Proton NMR produces a spectrum with a  number of peaks.  The number of peaks corresponds to the number of different chemical environments in which protons exist. OCREdexcelAQA Introducing NMR Enter your text here ... Proton NMR Enter your text here ... Carbon 13 NMR TMS Enter your text here ...  Looking at the pro...

Electricity and Magnetism
David Fowkes
GCSE Physics
When a current passes through a conductor in a magnetic field, the conductor experiences a force. The motor effect When a current passes through a conductor in a magnetic field, the conductor experiences a force. This force is used to provide the motion which drives electric motors. It is therefore known as the Motor Effect Enter your text here ... Enter your text here ...
alkanes and alkenes
David Fowkes
IGCSE Chemistry
image to show the tetrahedral shape of the methane molecule the alkanes are a family of hydrocarbons. hydrocarbons are compounds containing hydrogen and carbon only. methane is the simplest hydrocarbon with the formula CH4. the rest of the "family" (aka:  homologous series)  is below: ​Methane CH4Ethane C2H6Propane C3H8Butane C4H10
Electronegativity
David Fowkes
Chemistry A Level
Electronegativity values  Electronegativity values allow us to predict the direction and strength of dipoles which might exist in molecules
Electricity
David Fowkes
GCSE Physics
Symbols from AQA trilogy syllabus Symbols used in electrical circuit diagrams:  Enter your text here ... Enter your text here ...
1.40 - 1.43 Ionic Bonding - properties
David Fowkes
IGCSE Chemistry
​1.34 understand that ionic compounds have high melting and boiling points because of strong electrostatic forces between oppositely charged ions1.35 understand the relationship between ionic charge and the melting point and boiling point of an ionic compound1.36 describe an ionic crystal as a giant three-dimensional lattice structure held together...
1.37 - 1.39 Ionic bonding - transferring charge
David Fowkes
IGCSE Chemistry
Ionic compounds form when the atoms of a metal combine with the atoms of a non - metal 
1.37 Ionic bonding - transferring charge
David Fowkes
Uncategorized
Ionic compounds form when the atoms of a metal combine with the atoms of a non - metal 
1.38 Ionic bonding - know your ions
David Fowkes
Uncategorized
looking for patterns  1.38 Activity. Know your ions.  Students should: 1.38 know the charges of common ions listed You will have noted from the video that metal atoms tend to lose the electrons in their outermost electrons and form positive ions. The charge of the ion formed is equal to the number of electrons lost. Non metal atoms gain el...
1.39 Ionic bonding - finding formulae
David Fowkes
Uncategorized
the formulae of five polyatomic ions and one monatomic ion to be learnt.  1.39 Activity. Finding formulae  Students should: 1.39 write formulae for compounds formed between the ions listed Watch the video closely pausing where instructed. Use the information given to work out the correct formulae for the following compounds: Name of compoundFormula lithium nitridepotassium oxidezinc oxidesilver chlorideLi3N&nb...
The Reactivity Series
David Fowkes
IGCSE Chemistry
Rust forms on iron and steel as a result of a redox reaction between iron and oxygen.  2.15 - 2.20 Loss and gain Oxidation and reduction reactions are very commonplace. When a element combines with oxygen that element is said to have been oxidised. When the oxygen is removed from an oxide of an element to leave the element on its own, the oxide is said to have been reduced. Here we will use broader definition of oxidation ...

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