CHEM 120 Lecture Notes - Lecture 23: Electroplating, Ion, Radioactive Decay

28 views2 pages

carmineminnow41

15 Jun 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Nerst Equation: non-standard/standard conditions are related;

-     

 

-    

When [products]/[reactants] = 1 that is standard conditions; still have Ecell

- Q < 1, cell does more work, favouring the reactants

- Q = K, cell does no work; E  

 

Electrolysis: electrical energy is used to drive a non-spontaneous reaction

- e is drawn from anode, charge labels are opposite of Galvanic cells

- cathode (reduced), anion (oxidized)

Molten Salt Mixtures: to figure out which metal is the cathode, the highest IE is the one who

will be reduced at the cathode (Mg beats Na) & lowest EN atom will be oxidized (Br beats

Cl) at the anode it will release 2e

o cannot use E   because it only describes 1M aq. species, just given as

E without salt

Pure Water: anode = formation of O2|cathode = formation of H2|electrolyte = dilute aq. salt

solution

Aqueous Salt Mixtures: most negative Ehalf-cell will be oxidized at the anode & most

positive Ehalf-cell will be reduced at the cathode

Electroplating: process of depositing 1 metal on another

Faraday’s Law: amount of substance produced at each electrode is proportional to the

quantity o charge flowing through the cell

I = Q/t and n = Q/F

1 mol e = F

NUCLEAR CHEMISTRY

Positron: positive electron | α- particle: He atom

find more resources at oneclass.com

Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

cudapuca and 38677 others unlocked

CHEM 120 Full Course Notes

Verified Note

26 documents

Document Summary

When [products]/[reactants] = 1 that is standard conditions; still have e cell. Q < 1, cell does more work, favouring the reactants. Q = k, cell does no work; e (cid:1855)(cid:1857)=(cid:1866) Electrolysis: electrical energy is used to drive a non-spontaneous reaction. E is drawn from anode, charge labels are opposite of galvanic cells cathode (reduced), anion (oxidized) Molten salt mixtures: to figure out which metal is the cathode, the highest ie is the one who will be reduced at the cathode (mg beats na) & lowest en atom will be oxidized (br beats. Cl) at the anode it will release 2e: cannot use e (cid:1858) (cid:1855)(cid:1857) because it only describes 1m aq. species, just given as. Pure water: anode = formation of o2|cathode = formation of h2|electrolyte = dilute aq. salt solution. Aqueous salt mixtures: most negative ehalf-cell will be oxidized at the anode & most positive ehalf-cell will be reduced at the cathode.

Related Questions

Mc 12/20

Electrolysis of Molten Salts Electrolytic cells use electricity to cause a nonspontaneous redox reaction to occur. An electrolytic cell is constructed using the following components: a power source, such as a battery, the substance that will undergo electrolysis, and two inert electrodes (usually platinum), which serve as the electrical connection between the power source and the substance undergoing electrolysis. When electricity is applied to a molten binary salt during electrolysis, the cation will be reduced and the anion will be oxidized. If more than one cation is present, only the one with highest reduction potential will be reduced. Similarly, if more than one anion is present, only the one with the highest oxidation potential will be oxidized. Part A What substance is produced at the cathode during the electrolysis of molten calcium bromide, CaBr2? Assume standard conditions. Express your answer as a chemical formula. Hints SubmitMy AnswersGive Up Part B What substance is produced at the anode during the electrolysis of molten calcium bromide, CaBr2? Assume standard conditions. Express your answer as a chemical formula. Hints SubmitMy AnswersGive Up Part C What substance is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, CaBr2(l), and molten magnesium iodide, MgI2(l)? Assume standard conditions. Express your answer as a chemical formula. Hints SubmitMy AnswersGive Up Part D What substance is produced at the anode during the electrolysis of a mixture of molten calcium bromide, CaBr2(l), and molten magnesium iodide, MgI2(l)? Assume standard conditions. Express your answer as a chemical formula. Hints SubmitMy AnswersGive Up

Hello please answer e and f for me please! Thank you!

We used a Cu wire and 0.5 M HC2H3O2 in 0.5 M Na2SO4

In the electrolysis cell we shall study, the reduction reactionof interest will occur in a slightly acidic medium; hydrogen gaswill be produced by the reduction of hydrogen ion: 2H+ (aq) + 2e--> H2 (g)

Known:

Number of moles of hydrogen gas produced in eachtrial: Trial 1: 0.00197 moles; Trial 2: 0.001837moles

Moles of electrons (faradays) used to produce the hydogen gas ineach trial: Trial 1: 0.00394 moles e and Trial 2: 0.003674 molese

Possible reaction for the anode: Cu(s)--> Cu2+ (aq) + 2e Ered= -0.34

and cathode: So42- (aq) + 4H+ (aq) + 2e ---> H2SO3 (aq) + H2o(l) Ered= 0.20

Calculate the following:

1. Knowing the charge of the cations that are produced when themetal anode is oxidized, calculate the moles of metal that wereoxidized in each trial

2. From the loss of mass of the anode and the moles of anodethat were oxidized during the electrolysis, calculate the molarmass of the metal in each trial

3. Compare your molar mass result to the actual value anddiscuss the main sources of error

4. What is being reduced and what is being oxidized? Write thereduction and oxidation half reactions and the overall reaction

5. If 0.5 amps of current flowed for 10 minutes, what volume ofhydrogen gas would be produced at STP (standard temperature andpressure = 0 degrees celcius, 1 atm). Charge= current X time inseconds

fuchsiasquirrel325

CHEM 120 Lecture Notes - Lecture 23: Electroplating, Ion, Radioactive Decay

CHEM 120 Full Course Notes

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 120 Lecture Notes - Lecture 22: Electric Current, Eflow, Voltmeter

CHEM 120 Lecture Notes - Lecture 19: Lithium Battery, Molybdenum Disulfide, Magnetic Core

CHEM 1050 Lecture Notes - Lecture 4: Aqueous Solution, Sodium Chloride, Spontaneous Process

Related Questions