Redox Equilibria Flashcards Preview

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Flashcards in Redox Equilibria Deck (12):
1

What is used to measure the voltage of a simple cell?

Why?

High resistance galvinometer

Prevents the flow of current

2

What is used if there is no solid compound to used as an electrode

Platinum eletrode

3

Why are platinum electrodes used?

  1. Inert
  2. Good eletrical conductivity

4

What is the purpose of the salt bridge?

Completes the circuit

5

What is the setup of the standard hydrogen electrode?

A image thumb
6

How do fuel cells work?

  • Uses hydrogen and oxygen
  • Hydrogen split into protons and electrons and electrons flow around the circuit
  • At the other side, proton join with oxygen and electrons to form water

7

What are the benefits of fuel cells?

  1. They don't need recharging
  2. Only produce water

8

What are the downsides to fuel cells?

  1. Energy is needed to produce hydrogen and oxygen, usually from fossil fuels
  2. Hydrogen is explosive, creating safety issues with transportation and storage

9

What is the order of the electrodes in a cell diagram?

Without SHE:

Anode || Cathode

With SHE:

SHE || Other electrode

10

What is the order of the species in a cell diagram?

Least oxidised | Most oxidised || Most oxidised | Least oxidised

11

How can the direction of a reaction be determined from Eº values?

The couple with the most positive Eº goes as a reduction

12

A reaction is spontaneous if

Ecell > 0