Redox & Electrochemistry Chemistry Regents Vocabulary Flashcards
Anode
Oxidation occurs here.ALWAYS
Cathode
Reduction occurs here.ALWAYS
OIL RIG
Oxidation Is Loss of electronsReduction Is Gain of electrons
Electrochemical Cell
a device that converts chemical energy into electrical energy or vice versa.- Electrolytic (electrical to chemical)- Voltaic (chemical to electrical)
Electrode
A solid metal part of an electrochemical cell (Voltaic or Electrolytic), which gains or loses electrons.
Explain in terms of ions and atoms why the mass of the electrode increase...
Ions are becoming Atoms
Explain in terms of ions and atoms why the mass of the electrode decreases...
Atoms are becoming Ions
Electrolysis
a process in which an electric current forces a non-spontaneous chemical reaction to occur.This is also known at Electroplating, used only in Electrolytic Cells.
Electrolytic Cell
NON-SPONTANEOUSneeds energy to start, outside power-sourceconverts electrical energy into chemical energyAnode (least active) to Cathode (most active)
State the direction of electron flow through the wire in an Electrolytic Cell...
Anode to CathodeALWAYSLeast Active to Most Active(Table J)opposite
What MUST be in an Electrolytic cell?
Outside Power Source (Battery)
Voltaic Cell
SPONTANEOUSmust have a salt bridgeconverts chemical energy into electrical energyAnode (most active) to Cathode (least active)
State the direction of electron flow through the wire in an Voltaic Cell...
Anode to CathodeALWAYSMost Active to Least Active(Table J)
Salt Bridge
a pathway constructed to allow the passage of ions from one side to another
What is the purpose of the salt bridge?
allows ions to move.
What moves through the wire?
allows electrons to move.
Half-Reaction
a reaction that shows either the oxidation or reduction portion of a redox reaction.Shows the change in oxidation number from reactant to product side and also shows the number of electrons gained or lost.
Oxidation
Loss of ElectronsOxidation number becomes more positive (less negative).
Reducing Agent
the substance that gets oxidized.
Oxidation Half-Reaction
shows the reactant that loses electrons and the product it forms.Electrons are written on the RIGHT (product side)
In an Oxidation Half-Reaction which side of the chemical reaction are the electrons (e-) written on?
Product Side (Right)
Reduction
Gaining of ElectronsOxidation number becomes less positive (more negative).
Oxidizing Agent
the substance that gets reduced.
Reduction Half-Reaction
shows the reactant that gains electrons and the product it forms.Electrons are written on the LEFT (reactant side)
In an Reduction Half-Reaction which side of the chemical reaction are the electrons (e-) written on?
Reactant Side (Left)
Oxidation Number
Positive or negative charge that indicates how many electrons an atom has gained, lost, or shared to become stable.Gained (negative) - ReductionLost (positive) - Oxidation
Redox
stands for Reduction and Oxidation
How do you use Table J?
In a chemical reaction, a more active metal (higher up on Table J) will replace a less active metal when placed in an aqueous solution containing the ion of the less active metal. Voltaic Cell- more active (ANODE)- less active (CATHODE)Electrolytic Cell- less active (ANODE)- more active (CATHODE)