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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 |
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Electricity |
The movement of electrons |
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Conductor |
A material that allows the flow of electrons |
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Circuit |
Closed loop path for the flow of electrons |
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Oxidation |
Chemical process in which there is a loss of electrons (charge ⬆) |
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Reduction |
Chemical process in which there is a gain of electrons (charge ⬇) |
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Redox reaction |
Chemical reaction in which oxidation and reduction occurs |
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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 |
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E° Definition |
Standard reduction potential -temp 25°C -1 molar solutions |
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E° Equation |
E° = E°oxidation + E°reduction |
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Spontaneous vs Non spontaneous |
Spontaneous answer is positive Non spontaneous answer is negative |
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2 possibilities for why it could be non spontaneous |
1. Anode and cathode are backward 2. Not a real cell |
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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. |
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Anode definition |
the positively charged electrode by which the electrons leave a device. |
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Cathode definition |
the negatively charged electrode by which electrons enter an electrical device. |
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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 |
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What is on the cathode side? |
Gain Reduction Electroplating Conc. Decrease Equation looks like this: 3e- + Au+3 (aq) ➡ Au (s) |
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What is on the anode side? |
Loss Dissolving Conc. Increase Oxidation Equation looks like this: Ca (s) ➡ Ca+2(aq) +2e- |
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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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