Physical Chemistry Specifics Flashcards
1
Q
Unit for rate
A
mol dm⁻³ s⁻¹
2
Q
Arrhenius equation
A
k = Ae⁻ᴱᵃ/ᴿᵀ
3
Q
Why are ionic compounds soluble?
A
- Polar water molecules
- Attracts ions in ionic compound
- Breaks down lattice (dissolving it)
4
Q
More positive Eº (electropotentials)
A
More likely to be reduced (gain electrons)
5
Q
More negative Eº (electropotentials)
A
More likely to be oxidised (lose electrons)
6
Q
Eºcell?
A
Eºcell = Eºcathode - Eºanode
7
Q
Type of fuel cells
A
Acidic & Alkali
8
Q
Acidic fuel cell species exchanged
A
H⁺
9
Q
Alkaline fuel cell species exchanged
A
OH⁻
10
Q
Alkaline fuel cell reactions
A
Anode: 2H₂ + 4OH⁻ –> 4H₂O + 4e⁻
Cathode: O₂ + 2H₂O + 4e⁻ –> 4OH⁻
11
Q
Acidic fuel cell reactions
A
Anode: 2H₂ –> 4H⁺ + 4e⁻
Cathode: O₂ + 4H⁺ + 4e⁻ –> 2H₂O
12
Q
In electrochemical cells, which electrode is positive/negative?
A
Anode: negative
Cathode: positive
