Currently unavailable: until 19/12/2016
Degree: Veterinary Science (Bachelors) - Liverpool University
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|English||11 Plus||£18 /hr|
|Maths||11 Plus||£18 /hr|
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Rather than the furry creature, in chemistry a mole is a unit used to measure substances. Its equivalent to 6x1023 atoms, the number of carbon atoms in 12g of carbon.
To find a mole of a substance we use the equation Mass=Mr x mol (easily remembered as mass=Mr Mole). We can rearrange this to give Mass/Mr= Mol.
Therefore to find the amount of moles of a substance we need the mass and Mr. The Mr (relative formula mass) can be easily calculated using the relative atomic masses(Ar) of each element, as found in the periodic table. For example the Mr of water, H2O, is 18. This is because the Ar of hydrogen is 1, and we have 2 hydrogen atoms. The Ar of Oxygen is 16. 16+2=18.
If we have 5g of H2O, and the Mr is 18
Mol= mass/Mr mol=5/18 =0.278 (rounded to 3dp)see more
Alleles are different forms of a gene. For example, given the gene for eye colour there would be many different colours available. People with brown eyes would have the allele of the eye colour gene coding for this.
Take a group of friends; one friend has blue eyes, one brown, one green. Each of them has the gene for eye colour, but each has a different type- a different allele of the gene.
You will inherit one allele from each of your parents for each gene type. Some may be stronger, more dominant, than others. This will eventually determine which of these is expressed.see more