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Chemistry

GCSE · Edexcel

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  6
- Group 1: Reactivity & Electronic Configurations
  6
Group 7
Group 0

Qualitative Analysis: Tests for Ions
Hydrocarbons
Polymers
Alcohols & Carboxylic Acids
Bulk & Surface Properties of Matter Including Nanoparticles
- Nanoparticles
  7
- Ceramics, Polymers, Composites & Metals
  5

Electrolysis & Redox Flashcards

All 6 cards in this deck

What is oxidation in terms of electrons?: Loss of electrons.
What is reduction in terms of electrons?: Gain of electrons.
In electrolysis, which electrode is the site of reduction and which of oxidation?: Reduction at the cathode (cations gain electrons); oxidation at the anode (anions lose electrons).
What is the half equation for the formation of hydrogen gas from hydrogen ions at the cathode?: $\mathrm{2H^+ + 2e^- \rightarrow H_2}$
What is the half equation for the formation of oxygen from hydroxide ions at the anode?: $\mathrm{4OH^- \rightarrow O_2 + 2H_2O + 4e^-}$
True or false? In the half equation $\mathrm{2Cl^- \rightarrow Cl_2 + 2e^-}$ the chloride ions are oxidised.: True. They lose electrons, and this happens at the anode.