Created by Talya Hambling
about 8 years ago


Question  Answer 
how to work out moles from number of particles  number of particles you have/number of particles in a mole 
how to work out moles from mass  mass/mR 
how to work out moles from concentration and volume  concentration * volume/1000 (/1000 to get from cm to dm) 
what is empirical formula  smallest ratio of atoms in each element 
how to work out empirical formula from mass  find moles, then divide each by smallest number, then round up into ratio 
how to work out empirical formula from percentages  treat the percentage as mass (out of a 100g compound) 
how to work out molecular formula from empirical formula  multiply the numbers by the mR 
how to write an ionic equation  break up each element into its charged particles, rewrite equation including only the atoms that changed. EG: HNO+NaOG+NaNO+H20 H++NO+NA++OH _ Na++NO+H20 H++OH_H20 
how to work out moles from volume  volume in dm (cm/1000) / molar gas volume molar gas volume = 24dm^3 [or 24000 cm^3] 
what is the ideal gas equation  pV = nRT pressure*volume = moles*8.31*temp pressure = Pa volume = m^3 temp = K (c + 273) 
name 2 indicators and what they do  methyl orange = from yellow to red when acid added to alkali phenolphthalein = from red to clear when acid added to alkali 
how to do a general titration  place alkali in beaker, add indicator. pour known solution of acid into burette. do rough titration then 3 accurate ones. do finalinitial reading to get titre. calculate mean titre (concordant results) 
how to calculate percentage yield  actual yield/theoretical yield *1000 
how to find % atom economy  mass of desired product/ mass of all products *1000 
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