# Chemistry AQA equations GCSE

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#1
What equations must i need to know for AQA higher Chemistry? I've searched google so much but cant find an actual list of ALL the equations i NEED to know
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9 months ago
#2
Equations? Do you mean all the ions?
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9 months ago
#3
(Original post by Stargirl2.0)
What equations must i need to know for AQA higher Chemistry? I've searched google so much but cant find an actual list of ALL the equations i NEED to know
Hey, I'm doing my A-levels now so I've kind of forgotten which ones they exactly are, but you should try Quizlet- it should help x
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#4
(Original post by Deggs_14)
Equations? Do you mean all the ions?
No like atom economy equation etc. And others I can't remember bc that's why I put this post up 😂
0
9 months ago
#5
The hydrolysis of water as this is used in alkaline hydrogen-oxygen fuel cells.
O2 + 2H2O + 4e- —-> 4OH- (reduction)
2H2 + 4OH- —-> 2H2O + 4e- (oxidation)
Overall O2 + 2H2O —-> 2H2O
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9 months ago
#6
Here's some of them?:
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9 months ago
#7
(Original post by Stargirl2.0)
No like atom economy equation etc. And others I can't remember bc that's why I put this post up 😂
Oh in this case,
atom economy = (Σ Mr of useful products / Σ Mr of all reactants) x 100
% yield, = (theoretical yield / actual yield) x 100
mol = mass / Mr,
concentration = moles / volume in dm^3,
dm^3 = cm^3 / 1000,
Number of particles = mol x Avogadro constant (6.022x10^-23 mol^-1)
Isotopic abundance = (abundance of isotope 1 / total abundance x Mr) + (abundance of isotope 2/ total abundance x Mr) + ... + (abundance of isotope n / total abundance x Mr)
Last edited by Deggs_14; 9 months ago
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9 months ago
#8
Mass = Mr x mole
Mr = add together the Ar of every atom in the compound
Conc = mass / vol
Conc = moles / vol
Atom economy = useful mass / total mass
Percentage yield = actual yield / expected yield * 100%
RFM of a substance = (Abundance of isotope 1 x Mass of isotope 1) + (Abundance of isotope 2 x Mass of isotope 2)
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9 months ago
#9
(Original post by 19n19)
Mass = Mr x mole
Mr = add together the Ar of every atom in the compound
Conc = mass / vol
Conc = moles / vol
Atom economy = useful mass / total mass
Percentage yield = actual yield / expected yield * 100%
RFM of a substance = (Abundance of isotope 1 x Mass of isotope 1) + (Abundance of isotope 2 x Mass of isotope 2)
Lmao you literally copied what was on the picture above
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9 months ago
#10
(Original post by 1st superstar)
Lmao you literally copied what was on the picture above
I searched it up to help Stargirl2.0 and this came up on the student room, so I got it for her. You posted it two seconds before me so chill x
1
9 months ago
#11
(Original post by 19n19)
I searched it up to help Stargirl2.0 and this came up on the student room, so I got it for her. You posted it two seconds before me so chill x
But it's ok lol
0
#12
(Original post by 19n19)
Mass = Mr x mole
Mr = add together the Ar of every atom in the compound
Conc = mass / vol
Conc = moles / vol
Atom economy = useful mass / total mass
Percentage yield = actual yield / expected yield * 100%
RFM of a substance = (Abundance of isotope 1 x Mass of isotope 1) + (Abundance of isotope 2 x Mass of isotope 2)
Thanks, appreciate it xx
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