Topic 5: Formulae, Equations and Amounts of Substance
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11 Terms
What is Avagadro's constant?
6.02 x 10^23
What is empirical formula?
The simplest whole number ratio of atoms of each element in a compound
What is molecular formula?
The molecular formula gives the actual numbers of atoms in a molecule.
Phenolphthalein in acid
Colourless
phenolpthalein in alkali
pink
Methyl orange in acid
red
Methyl orange in alkali
yellow
What is atom economy?
A measure of the amount of starting materials that end up as useful products
What is yield?
amount of product obtained
How to minimise percentage uncertainty?
- increase resolution of apparatus
- increase size of measurement
Why actual yield is less than theoretical yield?
- side reactions
- incomplete reaction
- impurities
- loss in apparatus