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1.27 The Mole

1.27 The Mole

Uncategorized IGCSE Chemistry quantitative chemistry
A mole of rice grains would form a huge mountain of rice with enough rice to feed the world's current population for the next 6088978 years!

 1.27 What is a mole?  Students should: 1.27 know that the mole (mol) is the unit for the amount of a substance 1.28 understand how to carry out calculations involving amount of substance, relativeatomic mass (Ar) and relative formula mass (Mr) A mole (mol) is the quantity of anything that has the same number of particles as there are ato...

1.26 Formula masses

1.26 Formula masses

IGCSE Chemistry quantitative chemistry
Large numbers of coins can be counted by measuring their mass

 1.26 "Counting" by measuring mass Sometimes chemists need to "count" out a specific number of atoms, ions or molecules of a substance. Atoms are very very small - too small to see. It is therefore impossible to measure them out by counting individually.  Instead we "count" them out by measuring their mass - much like ...

Copy of Copy of 1.26 - 1.28 Moles and mountains

Copy of Copy of 1.26 - 1.28 Moles and mountains

IGCSE Chemistry quantitative chemistry

Relative masses allow chemists to "count out" atoms and molecules so they can ensure that the appropriate amounts of substances are reacted.

Rusting rates

Rusting rates

IGCSE Chemistry Rates of reaction

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Effect of particle size on the rate of rusting

Effect of particle size on the rate of rusting

IGCSE Chemistry Physical chemistry Rates of reaction

​To test the effect of particle size on the rate of oxidation we prepared three samples of steel wool each with different levels of coarseness (shown left). The test tube on the left contains the fine steel wool while the one in the middle contains the medium conciseness steel wool and the test tube on the right contains the coarsest stee...

Organic synthesis
David Fowkes
organic chemistry
Organic Reaction pathways  OCRAQAEdexcel Aliphatic routes  Aromatic routes Learn the reagents and changes 
Isomerism
David Fowkes
Chemistry A Level
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Testing for water
David Fowkes
IGCSE Chemistry
Water is an odourless, colourless liquid. So are many other chemicals . Introduction Water has no obvious smell.  Water has no taste and water is colourless. Water has a neutral pH value ( pH 7). Many other chemical substances have similar properties . We therefore need to find a chemiscal test for water.   Enter your text here ... When water is added to anhydrous (white) copper sulfate the copper s...
Testing for carbon dioxide
David Fowkes
Uncategorized
​Intro image Enter your text here ... Enter your text here ... ​To test for carbon dioxide. the test is to force the sample that you believe may be carbon dioxide in to a solution of lime water. if the sample does contain carbon dioxide then the solution will turn cloudy, if it does not then the sample cannot contain carbon dioxide. Enter your text...
Testing for oxygen
David Fowkes
Chemical tests
Oxygen is a  very reactive gas. It makes up approximately 20%  of our atmosphere.   ​The standard test for oxygen is to place a glowing splint into a test tube that may contain the gas. If the splint glows brighter and/or relights into flame then it is a positive result for oxygen.
Testing hydrogen
David Fowkes
IGCSE Chemistry
Introduction ​Hydrogen is a flammable gas. It burns in air to produce water. A convenient test for hydrogen is to put a lighted splint in the mouth of a test tube full of the gas . The gas will burn with a characteristic squeaky pop if hydrogen is present. Hydrogen gas can be used as a fuel.  When hydrogen burns in air it combines with ox...
Transition elements
David Fowkes
Chemistry A Level
Transition metals form coloured compounds OCREdexcelAQA Transition elements : properties  Ligands and complex ions Ligand substitution and precipitation Redox reactions  Electron configurations  The video here  uses the relevant section of the Royal Society of Chemistry's periodic table website to show the electron configurations of the first row of the transition ...
1.18 - 1.24 The periodic table
David Fowkes
IGCSE Chemistry
The elements in the periodic table are organised in order of increasing atomic number.
1.18 Organising the elements
David Fowkes
IGCSE Chemistry
The elements in the periodic table are organised in order of increasing atomic number.
1.19 Electron configurations
David Fowkes
IGCSE Chemistry
Carbon atoms have an electron configuration of 2,4  1.19 Deducing electron configurations  Students should: 1.19 understand how to deduce the electronic configurations of the first 20 elements fromtheir positions in the Periodic Table A carbon atom has 6 protons and therefore 6 electrons. The electrons are arranged in two shells; 2 electrons in the first shell and 4 electrons in...

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