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20 Cards in this Set

  • Front
  • Back

Electrochemistry

The study of how chemical energy can be changed into electrical energy and vice versa

Electricity

The movement of electrons

Conductor

A material that allows the flow of electrons

Circuit

Closed loop path for the flow of electrons

Oxidation

Chemical process in which there is a loss of electrons (charge ⬆)

Reduction

Chemical process in which there is a gain of electrons (charge ⬇)

Redox reaction

Chemical reaction in which oxidation and reduction occurs

REASONS A CELL STOPS WORKING

1) the anode completely dissolves


2) the circuit is broken


3) the cathode solution has a concentration of zero


4) the porous membrane ruptures

Definition

Standard reduction potential


-temp 25°C


-1 molar solutions

E° Equation

E° = E°oxidation + E°reduction

Spontaneous vs Non spontaneous

Spontaneous answer is positive


Non spontaneous answer is negative

2 possibilities for why it could be non spontaneous

1. Anode and cathode are backward


2. Not a real cell

Why reduction and oxidation must occur together and how heats produced


Oxidation is the loss of electrons so the electrons have to go somewhere so they go to the cathode where reduction occurs because reduction is the gain of electrons. IF THE SUBSTANCES ARE IN DIRECT PHYSICAL CONTACT HEAT IS PRODUCED.

Anode definition

the positively charged electrode by which the electrons leave a device.

Cathode definition

the negatively charged electrode by which electrons enter an electrical device.

How do you know which side is the anode and which is the cathode?

Electrons leave the anode and go to the cathode and the ions move from the cathode to anode

What is on the cathode side?

Gain


Reduction


Electroplating


Conc. Decrease


Equation looks like this:


3e- + Au+3 (aq) ➡ Au (s)

What is on the anode side?

Loss


Dissolving


Conc. Increase


Oxidation


Equation looks like this:


Ca (s) ➡ Ca+2(aq) +2e-

The notation thing what is the order and stuff

Anode on left seperation by double line then cathode looks something like this:


Ca | Ca+2 || Au+3 |Au

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