Unit 2: Redox Flashcards
(23 cards)
What is Electrochemistry?
- The study of electron transfer in a chemical reaction
What is Reduction?
Does it gain or lose an electron?
- Reduction is when an atom/ion GAINS an electron.
- Because it is gaining, the electron is at the reactant.
What is Oxidization?
Does it gain or lose an electron?
- Oxidization is when an atom/ion LOSES an electron.
- Because it is losing, the electron is at the product.
How do we remember what is losing and what is gaining?
(+) LEOx
(-) GERed
What is the difference between RA and OA? and how do we find them in our redox table?
- RA: Ingredient that causes the oxidization and gives e-
- OA: Ingredient that causes the reduction and gains e-
- The SOA is at top left, SRA is at the bottom right
How do we know what is spontaneous and non-spontanteous?
- Spontaneous: OA/RA (+) Voltage
- if non spontaneous, it requires energy (-) Voltage
How to write a net ionic equation?
Write species list
- Check Solubility table
- Check aqueous states
- If (aq) then theres water
- If acidic theres H+ and vice versa
- Then find the SOA and SRA
- Make your 1/2 reactions
- Add them for net ionic
What are oxidization numbers used for? And what are the rules?
- They are used to keep track of amt of electrons lost/gained.
- Hydrogen in compounds are -1
- In molecular compound, the atoms with the greater electronegativity will be priority in oxidization number
- Make sure the net charge is 0
What are voltaic cells?
- Spontaneous
- Chemical -> Electrical energy
- Consists of two electrodes
- Has electrolyte
- Divided in to two cells
- OA and RA electrons are transffered using a wire
What way does the electrons transfer in the wire? What way does the anion and cations transfer in the salt bridge?
- In the wire, it goes from anode to cathode
- Anions/Negative ions flow towards anode
- Cations/Positive ions flow towards cathode
What is the cathode and anode?
- Cathode: SOA
- Anode: SRA
What is an inert electrode and what is it used for?
- Inert electrode facilitate movement of electron.
- It is a solid metal that does not react.
- They are used where there is no metal in the ion.
- It is not SOA or SRA.
What is Voltage?
- Difference in energy between two points.
- The bigger the difference, the stronger the battery.
- SOA has the highest voltage.
What is the difference between reduction potential VS oxidization potential?
- Reduction potential is the normal voltage youll see in the reduction table
- Oxidization potential is the opposite.
Changing the reference
- Setting the reaction’s voltage in to 0.00
- Anything higher than that has a (+) voltage and vise versa
Stoichometrey Steps
- Species List
- Net Ionic Equation
- Convert the known information into moles
- Use GOLDEN RATIO to transfer moles
- Convert the moles into the unknown unit
Acrynom for balancing without any redox table
Major OH-
Balance the electrons
What is Molten?
- Just a hot liquid state
- The ionic compounds still split but the state is just liqiud.
Define Electroplating and electro-refining
- Electroplating: Process of plating one metal onto another through electrolysis
- Electro-refining: Impure comounds - pure through electrolysis
What are ways to prevent corrosion/rust?
- Paint
- Galvanizing
- Sacrificial Anode
- Applying a current
What does it mean to Galvanize?
- Coat it with zinc
What is a sacrifical anode? And what are good sacrificial anodes?
- Metal that is installed to be sacrficied and be rusted so it can protect a more valuable metal.
- Cr and all the metals below it are good sacrificial anodes.
How to convert hrs -> mins -> secs
Convert secs -> mins
Convert secs -> hrs
hours to minutes. times 60
minutes to seconds. times 60
