Chemistry- Electrolysis

kushagramodi56's version from 2015-05-10 13:20


Question Answer
How can't solid ionic compounds conduce electricityAs they have strong electrostatic forces meaning the ions are unable to carry charge or move freely.
How can ionic compounds conduct electricity By being melted or dissolved in water. Therefore, ions aren't held by strong electrostatic forces so they can carry charge and move freely.
What is electrodeMaterial that carries electric current
What are electrolytesSubstances broken down by electrolysis
What is +ve ions called cations
What is -ve ions called anions
What is +ve electrode called anode
What is -ve electrode called cathode
What is oxidationLoss of electrons
What is reductionGain of electrons
Which ion goes to cathode in aqueous solutionsIf metal is less reactive than hydrogen, it will go to cathode. If more reactive than hydrogen, hydrogen will go to cathode.
Half equation for hydrogen2H+ + 2e- = H2
Which ions goes to anode in aqueous solutionsIf metal is more reactive than hydroxide, it will go. If less reactive, then hydroxide goes
Half equation for hydroxide40H- = 02 +2H20 + 4e-
What is electroplatingCoating thin layer of metal on object by electrolysis
Why do we electroplate objects1. Protect metal underneath from corroding
2. Make objects look attractive
3. Increase hardness of surface so increase resistance from scratching
4. Save money