ap chemistry electrochemistry

1. Electrochem day 2

2. Drawing a battery

3. Shorthand way to draw battery

4. Shorthand way to draw battery

5. Standard conditions
• All electrical voltage values are at “standard
conditions” 1M solutions, 25C, 1ATM
• What if you get a battery COLD? LESS VOLTS!
• What if you change the concentration of the
solutions in the battery? VOLTAGE CHANGES!
• How does the voltage change? Go up or
down???

6. ELECTRONS FLOWING ….
• How fast do electrons move through wire?
• NOT FAST!! Like 1 foot in 4-5 seconds.
• As one bumps into wire it just bumps one out the end
of the wire.
• What is an AMP?
• An amp is when you have 6.2E18 electrons move past a
point in one second.
• An easier name for this is one coulomb/second
• So… 1amp = 1 coulomb/second
• What’s a volt?
• A volt is the number of joules/coulomb

7. Memorize me
• 1 coulomb = 6.2E18 electrons/second
• 1 amp = 1 coulomb/second
• 1 amp = 6.2E18 electrons/second
• Amp x second = coulomb
• A mole of electrons is 6.02E23 electrons
• So… how many coulombs does it take until you have a
MOLE of electrons?
• 6.02E23/6.2E18 = 96,500
• 96,500 coulombs = 1 mole electrons
• That’s called the FARADAY constant.
• What is a VOLT? It’s a joule/coulomb
• Why is there only a table of REDUCTION POTENTIALS?
Where is the Oxidation Potential table????

8. What happens at the CATHODE of the
battery?
REDUCTION!!!

9. Is the cathode the positive or negative
end of the battery?
positive!!! CATS ARE A positive
experience

10. What happens at the ANODE of the
battery?
oxidation!!!

11. The anode is the where the _____
come out of the battery?
electrons!!!

12. Which metal is the anode?

13. Which metal is the anode?

14. What is the voltage of this battery?