AQA A-Level Chemistry - Amount of
Substance, Amount of Substance -
AQA A-Level Chemistry
Relative Atomic Mass - CORRECT ANSWER ✔✔✔ The average mass of an atom of an element,
compared to that of the mass of 1/12th of the average mass of an atom of carbon-12
Relative Molecular Mass - CORRECT ANSWER ✔✔✔ The average mass of one molecule compared to
1/12th of the mass of one atom of carbon-12
Avogadro Constant - CORRECT ANSWER ✔✔✔ The number of particles in one mole of an atom: 6.022 x
10^23
Solvent - CORRECT ANSWER ✔✔✔ A liquid that can have a substance dissolved into it
Solute - CORRECT ANSWER ✔✔✔ A solid that can be dissolved
Solution - CORRECT ANSWER ✔✔✔ A solute dissolved in a solvent
Ideal Gas Equation - CORRECT ANSWER ✔✔✔ pV = nRT
Concentration - CORRECT ANSWER ✔✔✔ Moles / Volume
Amount of substance in moles dissolved in 1dm3 of solution
Mol dm-3
Moles (mass) - CORRECT ANSWER ✔✔✔ Mass / Mr
Atom Economy - CORRECT ANSWER ✔✔✔ Mr of producta/ sum of Mr of all reactants x 100
Percentage Yield - CORRECT ANSWER ✔✔✔ (actual output / predicted output) x 100
Calculating empirical formula - CORRECT ANSWER ✔✔✔ 1. % by mass
2. Divided by Ar
3. Divide by smallest
Calculate molecular formula - CORRECT ANSWER ✔✔✔ Relative molecular mass divided by relative
mass of empirical formula
equation for amount of moles (Avogadro constant) - CORRECT ANSWER ✔✔✔ amount of moles =
number of particles / Avogadro constant
4 reasons for lack of 100% percentage yield? - CORRECT ANSWER ✔✔✔ loss by mechanical transfer,
loss during separating technique, unwanted side reactions, reaction not complete
units - CORRECT ANSWER ✔✔✔ 1cm3 - 1ml
1dm3 - 1l
, 1dm3 - 1000cm3
what is titration an example of? - CORRECT ANSWER ✔✔✔ volumetric analysis
2 reasons why conical flasks are used in titration? - CORRECT ANSWER ✔✔✔ 1. can swirl reactant
easily
2. sloped sides ensure solution can not spill out
what is the dilution factor? how is it calculated? - CORRECT ANSWER ✔✔✔ the amount the original
solution is diluted by.
new total volume/ volume of original solution added
what is the dilution factor of 25cm3 to 250cm3 - CORRECT ANSWER ✔✔✔ 10
what is important about the first titre? - CORRECT ANSWER ✔✔✔ it should be rough and bigger than
the two accurate titrations
what is a standard solution? - CORRECT ANSWER ✔✔✔ a solution of known concentration
what should values be recorded to in a titration? - CORRECT ANSWER ✔✔✔ 0.05cm3
what should two accurate titre values be? - CORRECT ANSWER ✔✔✔ within 0.10cm3 of each other
how to convert from gdm-3 to moldm-3? - CORRECT ANSWER ✔✔✔ gdm-3 multiplied by Mr
equation for percentage error? - CORRECT ANSWER ✔✔✔ error of equipment/volume of solution
what kind of titration is phenolphthalein used for? - CORRECT ANSWER ✔✔✔ a strong and weak acid-
strong base
what is the colour of phenolphthalein in 3 solutions? - CORRECT ANSWER ✔✔✔ acid - colourless
neutral - colourless
alkaline - pink
what is the colour of methyl orange in 3 solutions? - CORRECT ANSWER ✔✔✔ acid - red
neutral - orange
alkaline - yellow
which solution goes in the conical flask? - CORRECT ANSWER ✔✔✔ alkali
which solution goes in the burette? - CORRECT ANSWER ✔✔✔ acid
what is the molar volume? - CORRECT ANSWER ✔✔✔ 1 mole of a gas occupies a volume of 24dm3 at
room temperature and pressure
equation for moles (gas) - CORRECT ANSWER ✔✔✔ moles = volume / 24dm3
what three factors does the ideal gas equation relate? - CORRECT ANSWER ✔✔✔ 1. as pressure
increases, the volume of a gas decreases
Substance, Amount of Substance -
AQA A-Level Chemistry
Relative Atomic Mass - CORRECT ANSWER ✔✔✔ The average mass of an atom of an element,
compared to that of the mass of 1/12th of the average mass of an atom of carbon-12
Relative Molecular Mass - CORRECT ANSWER ✔✔✔ The average mass of one molecule compared to
1/12th of the mass of one atom of carbon-12
Avogadro Constant - CORRECT ANSWER ✔✔✔ The number of particles in one mole of an atom: 6.022 x
10^23
Solvent - CORRECT ANSWER ✔✔✔ A liquid that can have a substance dissolved into it
Solute - CORRECT ANSWER ✔✔✔ A solid that can be dissolved
Solution - CORRECT ANSWER ✔✔✔ A solute dissolved in a solvent
Ideal Gas Equation - CORRECT ANSWER ✔✔✔ pV = nRT
Concentration - CORRECT ANSWER ✔✔✔ Moles / Volume
Amount of substance in moles dissolved in 1dm3 of solution
Mol dm-3
Moles (mass) - CORRECT ANSWER ✔✔✔ Mass / Mr
Atom Economy - CORRECT ANSWER ✔✔✔ Mr of producta/ sum of Mr of all reactants x 100
Percentage Yield - CORRECT ANSWER ✔✔✔ (actual output / predicted output) x 100
Calculating empirical formula - CORRECT ANSWER ✔✔✔ 1. % by mass
2. Divided by Ar
3. Divide by smallest
Calculate molecular formula - CORRECT ANSWER ✔✔✔ Relative molecular mass divided by relative
mass of empirical formula
equation for amount of moles (Avogadro constant) - CORRECT ANSWER ✔✔✔ amount of moles =
number of particles / Avogadro constant
4 reasons for lack of 100% percentage yield? - CORRECT ANSWER ✔✔✔ loss by mechanical transfer,
loss during separating technique, unwanted side reactions, reaction not complete
units - CORRECT ANSWER ✔✔✔ 1cm3 - 1ml
1dm3 - 1l
, 1dm3 - 1000cm3
what is titration an example of? - CORRECT ANSWER ✔✔✔ volumetric analysis
2 reasons why conical flasks are used in titration? - CORRECT ANSWER ✔✔✔ 1. can swirl reactant
easily
2. sloped sides ensure solution can not spill out
what is the dilution factor? how is it calculated? - CORRECT ANSWER ✔✔✔ the amount the original
solution is diluted by.
new total volume/ volume of original solution added
what is the dilution factor of 25cm3 to 250cm3 - CORRECT ANSWER ✔✔✔ 10
what is important about the first titre? - CORRECT ANSWER ✔✔✔ it should be rough and bigger than
the two accurate titrations
what is a standard solution? - CORRECT ANSWER ✔✔✔ a solution of known concentration
what should values be recorded to in a titration? - CORRECT ANSWER ✔✔✔ 0.05cm3
what should two accurate titre values be? - CORRECT ANSWER ✔✔✔ within 0.10cm3 of each other
how to convert from gdm-3 to moldm-3? - CORRECT ANSWER ✔✔✔ gdm-3 multiplied by Mr
equation for percentage error? - CORRECT ANSWER ✔✔✔ error of equipment/volume of solution
what kind of titration is phenolphthalein used for? - CORRECT ANSWER ✔✔✔ a strong and weak acid-
strong base
what is the colour of phenolphthalein in 3 solutions? - CORRECT ANSWER ✔✔✔ acid - colourless
neutral - colourless
alkaline - pink
what is the colour of methyl orange in 3 solutions? - CORRECT ANSWER ✔✔✔ acid - red
neutral - orange
alkaline - yellow
which solution goes in the conical flask? - CORRECT ANSWER ✔✔✔ alkali
which solution goes in the burette? - CORRECT ANSWER ✔✔✔ acid
what is the molar volume? - CORRECT ANSWER ✔✔✔ 1 mole of a gas occupies a volume of 24dm3 at
room temperature and pressure
equation for moles (gas) - CORRECT ANSWER ✔✔✔ moles = volume / 24dm3
what three factors does the ideal gas equation relate? - CORRECT ANSWER ✔✔✔ 1. as pressure
increases, the volume of a gas decreases
