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Summary C3 Quantitative Chemistry
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A complete summarised group of documents complete for GCSE Chemistry AQA 9-1. To make these Summaries I used 3 sources: The CGP revision guide, My GCSE Science Videos and Free science lessons videos. I achieved a 9 in GCSE AQA Triple Chemistry.

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  • May 30, 2019
  • 6
  • 2017/2018
  • Summary

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  • gcse aqa 9 1 triple chemistry

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C3 Quantitative Chemistry
Relative Formula Mass
 All the atomic masses of a compound added together
 E.g. MgCl2 = 95

Calculating the percentage of Mass of an element in a




compound
MOLEz
 The name given to the amount of a substance
 1 mole is equal to 6.02 x 1023 atoms
 One mole can be atoms, molecules, ions or electrons
 Once mole of atoms/molecules will have the same mass in grams as its relative formula mass
SO, 1 MOLE OF CARBON IS EQUAL TO 12 GRAMS

Finding the number of moles in a Given Mass




Practice Questions
1. How many moles are there in 66g of Carbon Dioxide?
2. What mass of carbon is there in 4 moles of carbon dioxide?
3. How many molecules are contained in 0.65 mole of sulphur dioxide, SO2?
4. How many moles of hydrogen contain 5.5 x 1024 molecules of H2?
5. How many molecules are in 150 g of water, H2O?

Conservation of Mass
 In a chemical reaction no atoms are created or destroyed
 Same number of atoms and types are on both sides of the equation
 You can show the conservation of mass by adding up all of the products and reactants on either
side

If the mass changes?
 Mass increase- probably because one of the reactants is a gas found in the air
1. Before the reaction the gas is floating around in the air in an uncontained reaction vessel so
its mass isn’t accounted for

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