Topic 9 - Redox Reactions Flashcards
1
Q
What happens to oxygen during REDOX reactions?
A
- oxidation: involves a substance combining with oxygen
- reduction: involves removal of oxygen
2
Q
What happens to hydrogen during REDOX reactions?
A
- oxidation: involves removal of hydrogen
- reduction: addition of hydrogen
3
Q
What happens to electron transfer during REDOX reactions?
A
- oxidation: involves loss of electrons
- reduction: involves gain of electrons
4
Q
What happens to oxidation states during REDOX reactions?
A
- oxidation: involves increasing oxygen state
- reduction: involves decreasing oxygen state
5
Q
What is oxidation?
A
- addition of oxygen
- loss of hydrogen
- loss of electrons
- increasing oxidation state
6
Q
What is reduction?
A
- loss of oxygen
- addition of hydrogen
- addition of electrons
- decreasing oxidation state
7
Q
What is an oxidising agent?
A
- causes another species to be oxidised (reduced itself)
8
Q
What is a reducing agent?
A
- causes another species to be reduced (oxidised itself)
9
Q
What is the activity series?
A
- ranks the metals according to the ease with which they undergo oxidation (those higher up can displace those lower down from solutions of their respective salts)
10
Q
How do you calculate the concentration of oxygen in ppm?
A
- mass of solute (in mg)/volume of solution (in dm3)
11
Q
What is energy?
A
- the capacity to do work
12
Q
What is the voltaic cell?
A
- consists of two half cells
- oxidation occurs at the anode and reduction occurs at the cathode
(- salt bridge)
13
Q
What is the electrolytic cell?
A
- using an electrolytic cell
14
Q
What are the cathode and anode in a voltaic cell?
A
- cathode is positive
- anode is negative
15
Q
What are the cathode and anode in a electrolytic cell?
A
- cathode is negative
- anode is positive
