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Quantitative Chemistry (THE CONSERVATION OF MASS (Relative Formula Mass…
Quantitative Chemistry
THE CONSERVATION OF MASS
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Relative Formula Mass
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Due to conservation of mass, the sum of the relative formula
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AMOUNT OF SUBSTANCE
Balanced Equations
- show the number of moles of each product and reactant
- can be used to calculate the mass of the reactants and products
Amount of Substance
A mole (mol) is a measure of the number of particles (atoms, ions or molecules) contained in a substance.
One mole of any substance contains the same number of particles - six thousand billion billion or 6.02 x 10(23)
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Limiting Reactants
Sometimes when two chemicals react together, one chemical is completely used up during the reaction
When one chemical is used up, it stops the reaction going any further. This is called the limiting reactant.
The other chemical, which is not used up, is said to be in excess.
Moles of a Gas
At room temperature and pressure, one mole of any gas tkaes up a volume of 24dm3
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TITRATION
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Carrying Out a Titration
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Titration is an accurate technique used to find out how much of an acid is needed to neutralise an alkali
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