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Step 1: Work out the moles of NaOH and HCl added into the solution 10cm^3 of 1M NaOH would mean that there is 10cm^3/1000cm^3 x 1M present, i.e. 0.01 moles 15cm^3 of 0.5M HCl would mean that there ...

A mole is like a dozen - it is a number of something. You can have a dozen people (12 people), a dozen oranges and so on. A dozen is useful for big objects like oranges, but atoms and molecules a...

The atomic radius of an atom is the distance from the atom's nucleus to its outermost electron. Moving across Period 3, the number of protons in the nucleus increases - for example sodium has 11 protons, ...

To form Al2O3 you need both Al and O2 (oxygen gas is a dimer):

Al + O2 -> Al2O3

But this equation is not balanced. To balance it, first equate the number of oxygen atoms:

Al + 3O2 ...

London dispersion forces. These arise because: 1. Electrons within the halogen molecule are constantly moving and at any one instant there is an uneven distribution of electrons within the molecule. 2. Th...