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AQA Chemistry A Level > Electrochem > Flashcards

Electrochem Flashcards

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1
Q

In a standard cell representation, where does the most negative half cell go?

A

Half cell with most negative potential goes on the left

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2
Q

What is the standard hydrogen electrode used for?

A

Measuring the electrode potential of half cells

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3
Q

What is the cell potential of the standard hydrogen electrode?

A

0V

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4
Q

What are the standard conditions needed when measuring half cell potential with standard hydrogen electrode?

A

1.0 mol dm^3 solution of H+
298K
100kPa

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5
Q

What does the hydrogen electrode consists of?

A

HCl
Hydrogen gas
Platinum electrode

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6
Q

Why is a platinum electrode used in a half cell?

A

Metallic so conducts electricity but is also inert so wont react with acid

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7
Q

What is a salt bridge used for?

A

Transfer ions between solution

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8
Q

What factors can alter the electrode potential of a half cell?

A

Temp
Conc of ions
Pressure

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9
Q

In an electrode, what reaction occurs at the most negative electrode?

A

Oxidation

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10
Q

In an electrode, what reaction occurs at the most positive electrode?

A

Reduction

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11
Q

How do you calculate EMF?

A

Emf(R) – Emf(L)

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12
Q

In the electrochemical series, which half reaction contains the best oxidising agent and which contains the best reducing agent?

A

Oxidising - Most positive one

Reducing - most negative one

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13
Q

When combing the half equations for an electrode, which equation should you flip?

A

The most negative one

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14
Q

What are the standard conditions of an electrode?

A

1.0 mol dm^3 of each solution for each ion solution
298K
100kPa

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15
Q

What is the start of the standard cell representation for a hydrogen electrode>

A

Pt / H+(aq) / H2(g)//

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16
Q

What can standard electrode potentials be used for?

A

Determining the feasibility of a redox reaction

17
Q

What is the value of the EMF is the reaction is feasible?

A

Positive

18
Q

How will an increasew in conc affect emf?

A

Make it more positive

19
Q

How will an increase in pressure affect emf?

A

Make it more negative

20
Q

What are the 3 types of electrochemical cells?

A

Rechargeable
Non rechargeable
Fuel cells

21
Q

What type of reaction occurs in a rechargeable cell?

A

Reversible

22
Q

What do lithium ion cells consists of?

A

Lithium cobalt oxide electrode
Graphite electrode
Lithium salt in organic solvent

23
Q

What reaction occurs at the negative electrode in a lithium ion cell

A

Li –> Li+ + e-

24
Q

What reaction occurs at the positive electrode in a lithium ion cell?

A

e- + Li+ + CoO2 –> Li^+[CoO2]^-

25
Q

How is a lithium ion cell recharged?

A

A current is applied over the cell to force the electrons in the other direction

26
Q

What is a fuel cell?

A

An electrochemical cell that does not need recharging

27
Q

What is required in a hydrogen fuel cell?

A

Continuous supply of hydrogen and oxygen to generate a continuous current

28
Q

What reaction occurs at the anode (+) in the hydrogen fuel cell?

A

H2 + 2OH- —> 2H2O + 2e-

29
Q

What reaction occurs at the cathode (-) in the hydrogen fuel cell?

A

O2 + 2H2O + 4e- —> 4OH-

30
Q

Benefit of using a hydrogen fuel cell?

A

Produces water as a waste product so seen as environmentally friendly

31
Q

Drawback of using hydrogen fuel cells?

A

Use highly flammable hydrogen
Expensive to produce

AQA Chemistry A Level (43 decks)

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