chemsitry as level topic 5 moles and equations


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

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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