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Mix the reagents and record the time taken for a specific observation, e.g. disappearance of colour which is characteristic for this chemical reaction. We repeat this step and add more manganese(II) ions;...

Moles equation is moles= mass/RFM Avogadro's constant is 6.x 10²³. 

1 mole means 6x 10²³ atoms/molecules. 

e.g. 2 mole of Cu weighs 128g. What is the weight of 1 Cu ato...

Methylamine is CH₃NH₂, and phenylamine is C₆H₅NH₂.

In methylamine, the methyl group exerts a positive inductive effect on the nitrogen atom in...

Work out what they know 

how are shells arranged?

how do electrons arrange themselves within the shells?

how many electrons per shell?

types of shells

how to write the a...

2NaNH2 + N2O --> NaN3 + NaOH + NH3

Mr(NaN3) = 65   Mr(NaNH2) = 39    
n(NaN3) = 550/65 = 8.46
100% NaN3 = 550/65 x 100/95 = 8.91
n(NaNH2) = 2 x 8.91 = 17.8
m(NaNH2) = 17....