Redox reactions Flashcards
1
Q
Oxidising agent
A
- accepts electrons from another reagent
- is reduced
2
Q
Reducing agent
A
- gives electrons to another reagent
- is oxidised
3
Q
Draw an electrochemical cell
A
- salt bridge
- high resistance voltmeter
- metal electrodes
- aqueous solution (1moldm^-3)
- standard conditions 298K, 100KPa
4
Q
Negative standard electrode potential
A
- produces more electrons
- oxidised
- stronger reducing agent
- equilibrium shifts to the left
5
Q
Standard electrode potential
A
- the potential difference of a cell
- when the electrode is connected to the standard hydrogen electrode
- under standard conditions
6
Q
Draw the standard hydrogen electrode
A
7
Q
Cell voltage formula
A
right E- left E
8
Q
Affect of concentration on electrode potential
A
- equilibrium will shift to counteract the change
- changes concentration of electrons
9
Q
Feasibility of reaction
A
- must have positive cell potential
- rate of reaction has no effect
10
Q
Lithium half cell battery advantage
A
- low density
- high reactivity
- high electrode potential
11
Q
Lithium half cell battery disadvantage
A
- toxic
- fire risk- high reactivity
12
Q
Fuel cell
A
- energy from reaction of fuel with oxyegn
- fuel- hydrocarbon, hydrogen or alcohol
- creates a voltage
- acidic or alkaline solution
13
Q
Advantage of fuel cell
A
- greater efficiency
- only H2O formed- not polluting
14
Q
Disadvantage of fuel cell
A
- H2 difficult to store
- H2 difficult to manufacture initially
15
Q
Positive standard electrode potential
A
- gains electrons
- reduced
- stronger oxidising agent
- equilibrium shifts to the right
