Mychem

Notes, explanations and resources for KS3, GCSE and A level Students of chemistry

The Transition Metals

What do the images above have in common? they are all show coloured substances. in each case the color is due to the presence of transition metal compounds. transition metals are responsible for a lot of naturally occurring colors Don't try this at home!  Questions:

transition metal questions

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The Halogens

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 gas bromine; a volatile orange-brown liquid. iodine; a shiny grey metallic-looking solid wi...
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alkanes and alkenes

the alkanes are a family of hydrocarbons. hydrocarbons are compounds containing hydrogen and carbon only. methane is the simplest hydrocarbon with the formula CH 4 . the rest of the "family" (aka:  homologous series)   is below: ​Methane CH 4 Ethane C 2 H 6 Propane C 3 H 8 Butane C 4 H 10
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Ionic Bonding

Conductivity when molten  Background ​When a metal combines with a non metal - the compound formed is usually ionic. Ionic compounds tend to form giant lattices. Ionic lattices have some distinctive physical properties: High melting points Conduct an electric current when molten​ They form crystals Many will dissolve well in water The vid...
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The Alkali metals

An overview of the alkali metals reacting with water. notice that all the metals react in the same way with water to produce hydrogen gas and an alkaline solution of the hydroxide of the metal. alkali metal + water  --> alkali metal hydroxide + hydrogen gas however the equations given in the video do not make proper use of subscripts N...
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Energy changes

Whenever a chemical change takes place there is also an energy exchange of some sort. Sometimes the energy exchange is a release of energy . A fuel is a substance which can be made to react and release energy in a useful form. ​Examples of some exothermic reactions . ​This shows a range of chemical changes - all of which release energy . In so...
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Atomic structure

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Your carbon footprint

reducing your carbon footprint Although this is aimed at students of the IB diploma - it is relevant to all .... Enter your text here ...
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Acids, Alkalis and pH

Background  ​ You should already know that: • some substances are acidic • the opposite of acidic is alkaline  • acids and alkalis can be harmful  • we can measure acidity or alkalinity using the pH scale Strong acids ​When an acid molecule ionises completely when in solution in water, it is regarded as a strong acid. It is said...
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Carboxylic Acids

Carboxylic acids can occur naturally : When alcohols are oxidised they can produce a type of acid known as a carboxylic acid.    one example of a carboxylic acid is ethanoic acid . This is also known as Acetic acid and is the acid found in vinegar. Other examples of carboxylic acids are methanoic acid ( also known as formic acid)  wh...
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Addition Polymers and condensation polymers

​Polymers are a very important group of compounds. Many organic ( carbon based)  molecules can be made to Polymerise. The word "poly" means many.  When a molecule is polymerised the ( usually short) monomer molecules join up with one another to form very long polymer molecules. Addition Polymerisation These two videos show ...
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Reduction of iron

See iron being formed in this violent, reduction reaction.  Iron III oxide and Aluminium react with one another .  Pure iron is produced. Try to write word equations for this reaction  What is reduced in this reaction?  What is oxidised? Magnesium ribbon is used as the fuse. Main reaction  Fuse  reaction Symb...
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