Electrolysis Flashcards
Electrolysis literally means
Pertaining to the flow of electrons
What does electrolysis result in
Discharge of ions as neutral atoms at the respective electrodes
Electrolysis is a ____ reaction
Redox
Electrolytes are ____ compounds
Ionic
Particles in electrolytes
Ions only or Ions and molecules only
Non electrolytes are ____ compounds
Covalent
Particles in non electrolytes
Molecules only
Examples of electrolytes
HCl, HNO3, CuSO4 , PbBr2, etc
Examples of non electrolytes
Pure water, Cs2, CCl4 , sugar solution, glucose, etc
Particles in strong electrolytes
Ions only
Example of 3 bases which are weak electrolytes
NH4OH, Mg(OH)2 , Ca(OH)2
Particles in weak electrolytes
Ions and unionised molecules
The device in which electrolysis is carried out
Electrolytic cell
Electrolytic cell is also known as ____
Voltammeter`
Metal plates which allow electric current to enter or leave the cell
Electrodes
Sometimes, graphite electrodes are used instead of metals? when
When products formed during electrolysis react with metals
Electrode connected to the positive terminal of the battery
Anode
Electrode connected to the negative terminal of the battery
Cathode
_____ migrate to anode
Anions
___ migrate to cathode
Cations
____ is the oxidising electrode
Anode
_____ is the reducing electrode
Cathode
Atoms which carry positive charge -_____
Atoms which carry negative charge - ______
Cations, Anions
Mechanism of electrolysis was first explained by ___ _____ in the year ____
Avante Arrhenius, 1887
Avante Arrhenius belonged to ___
Sweden
An electrolytic solution is in _____ _____
Electrolytic equilibrium
___________ is the extent to which an electrolyte dissociates into ions
Degree of dissociation
________ is responsible for the flow of current through the solution
Ions
In electrolysis, exchange of electrons takes place at the _____
Surface of the electrodes
Amount of electricity conducted by the electrolyte depends on
Concentration of ions in the solution
Electrolytic dissociation takes place in ____ compounds and involves _____ of ions
Ionic, separation
Ionisation takes place in ____ compounds and involves ___ of ions
Covalent, formation
__ ions are essential for conducting electricity
Free
water is a __ solvent
Polar
Polar covalent compounds are non electrolytes in the __ state but ionise in ___ state
Gaseous , Aq.soln
When an ionic compound is heated, what does the ions gain
Kinetic energy
in a metal, flow of electricity takes place by the flow of ____
Electrons
during ___ conduction there is no transfer of matter
Metallic
Copper is a good conductor of electricity but a non electrolyte ..why
does not undergo chemical decomp when electric current flows via it `
Electrolytes can be classified as strong or weak depending on
degree of dissociation
No. of electrons gained at anode =
No. of electrons donated by cathode
What is metal activity series otherwise called as
Electrochemical series
On what basis is the metal activity series arranged
Ease with which metals lose electrons
Elements which ionise _____ and are discharged with ___ are on the top of metal activity series
most readily, difficulty
Elements which ionise ______ and are discharged ________ are on the bottom of the metal activity series
with great difficulty, easily
State electrochemical series for metals
K Ca Na Mg Al Zn Fe Pb H Cu Hg Ag
State electro chemical series for anions
SO4 2- NO3 1- Cl 1- Br 1- I 1- OH 1-
