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Flashcards by Megan Phillips, updated more than 1 year ago
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| 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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