Electrochemistry!!(my least fav)

Vocab.

100

What is an oxidizing agent?

Electron acceptor

Species is reduced

200

What is an electron transfer reaction?

oxidation-reduction or redox reactions

300

What is the purpose of a salt bridge?

balance charges, full of + and - ions to balance 

anions move to anode

cations move to cathods

400

What is Electrolysis

The process in which electrochemical energy is used to bring about a chemical change

500

What is the standard Cell Potential?

—a quantitative measure of the tendency of

reactants to proceed to products when all are

in their standard states at 25 ˚C.

Random?

100

What occurs when electrons are lost

Oxidation

200

What occurs when Electrons are gained?

Reduction

300

What's an electrode?

an electrical conductor that connects the metallic parts of a circuit to a non-metallic part

Calculations

100

Name the oxidation numbers for SnH₄

Sn=+4

H=-1

200

Oxidation numbers for K₂SO₄

K=+1

S=+6

O=-2

300

Calculate the standard cell potential of a cell consisting of MglMg²⁺ and PblPb²⁺. 

DOUBLE: Write the half-cell reactions and the overall cell reaction

E=Ered-Eox

-0.13V-(-2.37)=2.29 V

(Mg-->Mg²⁺ +2e- anode

Pb²⁺+2e- ---> Pb cathode

Pb²⁺ +Mg--->Pb+Mg²⁺

400

Is the following reaction spontaneous?

Ni+Fe²⁺--->Ni²⁺ + Fe

Ni is oxidized and Fe is reduced so Fe-Ni

-0.45V-(-0.26 v0=-0.19 V

VOLTAGE IS NEGATIVE SO NONSPONTANEOUS

500

Balance the redox equation MnO₄- + C₂O₄^2---->MnO₂+ CO₃^2-

2MnO₄- + 3C₂O₄^2-+2H₂O--->2MnO₂+6CO₃^2-+4H+

Voltaic Cells

100

What occurs at the cathode?

Reduction (RED CAT, AN OX)

200

What is the equation to find Cell Voltage

E° cell=E_red-E_ox

300

Which way do electrons flow in a voltaic cell?

Toward the cathode (more positive)

400

Which way does energy move in electrochemical and electrolytic cells?

Chemical-energy out

Electrolytic-energy in

500

What is the charge of the anode in electrolytic cells

POSITIVE

Types of Batteries

100

What is the anode in a dry Cell?

Zn

200

How does a battery work?

A battery functions by transferring electrons

through an external wire from the reducing agent

to the oxidizing agent.

300

What makes alkaline different from dry cell?

Alkaline is the same thing, but in a basic enviornment

400

What is the anode and cathode in Lead Storage Batteries

Anode (-) : Lead grids

Cathode (+) : “Spongy” lead in grid

500

When Zn metal is placed in Cu²⁺ ions, what happens?

What's oxidized and what's reduced?

With time, Cu plates out onto Zn metal strip, and Zn strip “disappears.”

Zn is oxidized and is the reducing agent

Cu2+ is reduced and is the oxidizing agent