Electrochemistry
Electrochemistry — Formulae Sheet (Tabular Form)
| Concept | Formula | Units | Key Notes |
|---|---|---|---|
| Charge | Q = I × t | C | I = current (A), t = time (s) |
| Current | I = Q / t | A | Rearranged form |
| Time | t = Q / I | s | Rearranged form |
| Faraday Constant | F = 96500 | C mol⁻¹ | Charge per mole of electrons |
| Moles of Electrons | n(e⁻) = Q / F | mol | Core electrolysis formula |
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change O Level And IGCSE Chemistry Full Scale Course
| Concept | Formula | Units | Key Notes |
|---|---|---|---|
| Mass Deposited | m = (Q × M) / (n × F) | g | n = electrons transferred |
| Moles from Charge | n = Q / (n × F) | mol | For substance produced |
| Charge from Moles | Q = n(e⁻) × F | C | Total charge passed |
| Mass from Moles | m = n × M | g | Standard conversion |
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change O Level And IGCSE Chemistry Full Scale Course
| Concept | Formula | Units | Key Notes |
|---|---|---|---|
| Volume of Gas (RTP) | V = n × 24 | dm³ | For gases produced |
| Moles from Gas Volume | n = V / 24 | mol | Volume in dm³ |
| Efficiency (Electrolysis) | % efficiency = (actual / theoretical) × 100 | % | Practical yield |
| Energy Transfer | E = V × I × t | J | V = voltage |
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change O Level And IGCSE Chemistry Full Scale Course
| Concept | Formula | Units | Key Notes |
|---|---|---|---|
| Half Equation (Reduction) | Gain of electrons | — | e.g. Cu²⁺ + 2e⁻ → Cu |
| Half Equation (Oxidation) | Loss of electrons | — | e.g. 2Cl⁻ → Cl₂ + 2e⁻ |
| Total Reaction | Sum of half equations | — | Electrons cancel |
| Electrochemical Cell (Qualitative) | Chemical → Electrical energy | — | No formula required |
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change O Level And IGCSE Chemistry Full Scale Course
| Concept | Formula | Units | Key Notes |
|---|---|---|---|
| Current Efficiency Relation | m ∝ Q | — | More charge = more product |
| Time Relation | m ∝ t | — | Longer time = more product |
| Current Relation | m ∝ I | — | Higher current = more product |
| Overall Relation | m ∝ I × t | — | From Q = I × t |
Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change O Level And IGCSE Chemistry Full Scale Course