Diffusion – video
This video is a great way to see the diffusion of particles in action:
Harry Potter does The Elements – video
Watch Daniel Radcliffe sing the names of all the elements – it’s just a shame there are now more elements than were written into Tom Lehrer’s famous song…..
How do we separate the seemingly inseperable? – video
There are several things in this video which are “beyond the exam spec” but there are loads of interesting bits…..
Atomic structure – Tyler de Witt video
This video explains the basics of atomic structure, telling you what is inside an atom:
Build an atom – interactive
This is a good interactive demonstration showing how subatomic particles make up the atoms in the Periodic Table.
Calculation of relative atomic mass – Tyler de Witt video
This excellent video from Tyler de Witt walks you through what isotopes are, and how the relative abundance of those isotopes can be used to calculate the relative atomic mass of an element.
Balancing equations – Tyler de Witt videos
This excellent Tyler de Witt video is an introduction to balancing equations:
And here’s another of the lovely Tyler’s videos with some practice questions and answers on equation balancing:
Balancing equations – interactive
This is useful to help you to practice how to balance equations:
Calculation of relative formula mass – Tyler de Witt video
Here’s an excellent Tyler de Witt video explaining how to calculate the relative formula mass of compounds with:
- a simple formula
- a formula which includes brackets
- a formula which includes a dot (water of crystallisation)
Calculations involving mass (in grams), amount (in moles) and relative atomic mass – Tyler de Witt video
This video shows how to perform calculations involving mass (in grams), amount (in moles) and relative atomic mass:
Calculate Reacting Masses video
This video steps through a very useful method used to calculate reacting masses.
Empirical formulae and Molecular formulae – Tyler de Witt video
In this video, the lovely Tyler de Witt explains Empirical Formulae and Molecular formulae.
(Please excuse the horrid error right at the start where the video shows a diagram of prop-2-ene, but it is labelled ‘ethene’ by mistake.)
This second video then explains how, if given an empirical formula and a molecular mass, you can calculate the molecular formula:
Concentration (molarity) practice problems – Tyler de Witt video
Here is a video to help you with concentration calculations. In Chemistry, concentration is know as molarity (i.e. the amount per volume).
Note that in the video, the lovely Tyler de Witt uses the unit “liter” for volume, but the correct international unit (as used by UK exam boards) is decimeters cubed (dm3) which is the same thing as Tyler’s “liter”.
and a follow up video with some more examples:
What is an ion? – Tyler de Witt video
Knowing the answer to “What’s an ion?” is absolutely key to Chemistry.
If you aren’t sure what an ion is, or why the idea of ions is crucial to Chemistry, then you should watch this video:
Dogs teach ionic versus covalent bonding – video
This should give you a ruff idea of what the difference is between ionic and covalent bonding.
In an ion, the number of protons does not equal the number of electrons – Tyler de Witt video
In an electrically neutral ATOM, the number of electrons equals the number of protons.
However, an ION is an atom (or group of atoms) which has either gained or lost some electrons, so for an ION the number of electrons does not equal the number of protons.
This excellent Tyler de Witt video explains this clearly:
Writing ionic formulae – Tyler de Witt video
This excellent video from the lovely Tyler de Witt explains how to write the formula of an ionic compound:
Writing formulae with polyatomic ions – Tyler de Witt video
This video shows how to work out the formula of a compound which contains polyatomic ions:
Ionic bonding – Tyler de Witt videos
These videos are a really good introduction to ionic bonding:
Covalent bonding – videos
These videos are a good introduction to covalent bonding:
Diatomic elements – Tyler de Witt video
This excellent Tyler de Witt video addresses a common mistake around diatomic elements (H2, N2, O2, F2, Cl2, Br2, I2).
For example, if chlorine is in its elemental form (i.e. not bonded in a compound) the formula is Cl2, but when chlorine is bonded to sodium the formula of sodium chloride is NaCl.
(Triple only) Alloys and different forms of steel – video
This video explains the structure of alloys, including different forms of steel.
Note that a slight improvement could be made in the explanation: the structure of metals should be described as “layers of metal IONS in a sea of delocalised electrons”.
Electrolysis – Tyler de Witt video
Although quite long, this Tyler de Witt video is a good summary of Electrolysis.
Alkali metals and water – videos
The awesome Professor Sir Martyn Poliakoff shows us the reaction of some alkali metals and water.
Fluorine – video
Here is a great video on Fluorine, which is the most reactive halogen (group 7):
Halogen reactions with iron wool – video
The reactions of various halogens with iron wool is a great way to see how reactive one halogen is compared to another:
Reactions with oxygen – video
This video shows the reaction with oxygen of various elements:
Thermite displacement demonstration goes wrong – video
The thermite reaction is used to repair railways: the reaction between aluminium and iron oxide is highly exothermic and produces molten iron.
It should be properly controlled if demonstrated in the lab: watch this video and see how many mistakes in basic lab safety made by this teacher.
Galvanising – video
This video shows the galvanising of pieces of steel to protect them from rusting:
(Triple only) Titration calculations – videos
Here are a couple of videos explaining how to perform titration calculations:
Reaction profiles: exothermic, endothermic and activation energy – video
This video introduces reaction profiles which show how energy levels change during exothermic and endothermic reactions, and how this relates to the activation energy of a reaction.
(Triple only) Bond energy calculations – videos
Here are a couple of videos explaining how to do bond energy calculations:
Reversible reactions – video
Here is a video introducing reversible reactions:
(Triple only) Equilibria in reversible reactions: Temperature – video
This video explains how the position of equilibrium in a reversible reaction is affected by changes to temperature.
(Triple only) Equilibria in reversible reactions: Pressure – video
This video explains how the position of equilibrium in a reversible reaction is affected by changes to pressure.
Test for alkane vs alkene using Bromine – video
This video shows the addition reaction between bromine and an alkene.
The observation from the reaction is the colour change from orange to colourless.
Fractional distillation – videos
This video does not quite use the right language for the various fractions as appropriate to the Edexcel iGCSE, but it is nevertheless a good description of the process. Make sure you use the notes on tutorMyself.com to get the exact language you will need for your exam.
And another somewhat older video showing the industrial process of fractional distillation:
Cracking – videos
This video introduces the process of cracking, which is used to split a long-chained alkane into shorter-chained alkanes and alkenes.
It also tells you about the test used to distinguish between an alkane and an alkene (addition of bromine water).
And this somewhat older video talks more about the industrial process of cracking:
Introduction to alkanes – video
This video is a good introduction to alkanes and crude oil:
(Triple only) Alcohols – video
This video introduces alcohols:
(Triple Only) Manufacture of ethanol video
Here’s a great video which shows the 2 ways to make ethanol.
(Triple only) Carboxylic acids – video
This video introduces carboxylic acids:
Addition polymers – video
This video introduces addition polymers:
(Triple Only) Condensation polymers – video
This video introduces the idea of condensation polymers: