# chemsitry as level topic 5 moles and equations

### Description

chemsitry as level topic 5 moles and equations
Flashcards by Talya Hambling, updated more than 1 year ago
 Created by Talya Hambling about 8 years ago
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## Resource summary

 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 final-initial 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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