NSK
@21stCScienceC7
Bitesize chunks of revision material for OCR 21st Century Science Course C7 - Chemistry for a sustainable world.
Well done! Bye until next year. Look out for the a-level version. Good luck for the rest of your exams hope you found these tweeds useful.
4)then using the reacting masses and known mass of substance that has reacted, work out the mass of the 2nd substance that has reacted
interpreting titration results 1)Have a balanced equation 2)work out reacting masses 3)find out the mass of know substance that has reacted
When doing a titration then a number of results are taken and the mean found. This gives more confidence in the accuracy of the result.
There are five main sections to c7 1) organic chemistry 2) energy changes 3) reversible reactions and equilib 4) analysis 5) green chemistry
Alcohols react with carboxilic acids, in the presence of a sulfuric acid catalyst, to make esters
Answers 1) 40g/dm3. 2) 2.75g 3) Should be H2SO4 + Mg(OH)2 arrow 2H2O + MgSO4
2) If I have 50ml of sodium nitrate solution of concentration 55g/dm3, how many grams of sodium nitrate is present in my sample?
If I make a standard solution using 10g of magnesium sulphate in 250ml of solution what is its concentration?
take mass of solute, dissolve in small amount of solvent, transfer(with washing)to volumetric flask, make up to graduation mark with solvent
Atom economy = mass of desired product/mass of all reactants x 100%
Green Chemistry - Renewable feedstocks, atom economy, H&S, energy efficiency, reducing waste, cutting pollution
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