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chemsitry as level topic 5 moles and equations
Karten in diesem Stapel (15)
- 1how to work out moles from number of particlesnumber of particles you have/number of particles in a mole
- 2how to work out moles from massmass/mR
- 3how to work out moles from concentration and volumeconcentration * volume/1000
(/1000 to get from cm to dm) - 4what is empirical formulasmallest ratio of atoms in each element
- 5how to work out empirical formula from massfind moles, then divide each by smallest number, then round up into ratio
- 6how to work out empirical formula from percentagestreat the percentage as mass (out of a 100g compound)
- 7how to work out molecular formula from empirical formulamultiply the numbers by the mR
- 8how to write an ionic equationbreak 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 - 9how to work out moles from volumevolume in dm (cm/1000) / molar gas volume
molar gas volume = 24dm^3
[or 24000 cm^3] - 10what is the ideal gas equationpV = nRT
pressure*volume = moles*8.31*temp
pressure = Pa
volume = m^3
temp = K (c + 273) - 11name 2 indicators and what they domethyl orange = from yellow to red when acid added to alkali
phenolphthalein = from red to clear when acid added to alkali - 12how to do a general titrationplace 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) - 13how to calculate percentage yieldactual yield/theoretical yield *1000
- 14how to find % atom economymass of desired product/ mass of all products *1000
- 15—
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- chemsitry as level topic 5 moles and equations
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- Talya Hambling
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