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electrode potential 3.1.11 in papers 1+3

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Total cards: 20•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (20)

#1
Front (Question)

what is a salt bridge?

Back (Answer)

• allows for free moving ions • pottasium nitrate • should be unreactive with electrodes and their solutions

#2
Front (Question)

why use a high resistance voltmeter?

Back (Answer)

• to stop the electrons from flowing in a circuit • in this state its posible to meaure the maximum potential difference

#3
Front (Question)

what happens if the voltmeter is replaced with a bulb?

Back (Answer)

• a current flows • reaction will happen at each electrode • voltage falls to 0 as reactants are used up

#4
Front (Question)

what type of agent is at the positive electrode?

Back (Answer)

oxidising

#5
Front (Question)

what type of agent is at the negative electrode?

Back (Answer)

reducing

#6
Front (Question)

when is Pt included in cell diagrams?

Back (Answer)

when there isnt a solid

#7
Front (Question)

what are the standard conditions of a standard hydrogen electrode?

Back (Answer)

• 100kpa • 298k • 1moldm3 • pt electrode

#8
Front (Question)

what is the E0 value of a SHE?

Back (Answer)

0

#9
Front (Question)

how to calculate Ecell?

Back (Answer)

Erhs-Elhs

#10
Front (Question)

what does it mean if E0 value is more negative?

Back (Answer)

• equilibrium lies to the left • more easy it is to loose an electron anf form ions • making it a strong reducing agent

#11
Front (Question)

what happens if you increase the pressure?

Back (Answer)

• equilibrium shifts to the left • making the E naught value more negative

#12
Front (Question)

what happens when you increase Pt surface area?

Back (Answer)

• no effect • doesnt affect the ions

#13
Front (Question)

what happens when the concetration of H+ increases?

Back (Answer)

• shifts equilibrium to the right • Ecell value becomes more positive

#14
Front (Question)

what happens when the tempreture increases?

Back (Answer)

• equilibrium will shift to the left • Ecell value becomes more negative

#15
Front (Question)

can a reaction happen if an Ecell value is negative?

Back (Answer)

• no • the more positive it is, the more likely for the reaction is to happen

#16
Front (Question)

why does a fuel cell not need to be electrically recharged?

Back (Answer)

supplied continously

#17
Front (Question)

whats the half equation for the negative electrode of a alkaline hyodrogen-oxygen cell?

Back (Answer)

h2 + 2OH- -> 2h2o + 2e-

#18
Front (Question)

whats the half equation for the positive electrode of a alkaline hyodrogen-oxygen cell?

Back (Answer)

o2 + 2h2o + 4e- -> 4OH-

#19
Front (Question)

why is it not neccesary to replace KOH eletrolyte in a hydrogen-oxyfen fuel cell?

Back (Answer)

OH- ions produced in 1 equation are used in another

#20
Front (Question)

describe how reactions at the electrodes generate an electric current that can power the motor in the external circuit.

Back (Answer)

• electrons are released • electrons pass through the motor