Redox reactions Flashcards
(14 cards)
1
Q
types of redox reactions
A
- metal displacement
- electrochemical
- combustion
- corrosion
2
Q
northeast on table
A
will react
3
Q
higher reactivity
A
- more easily oxidised
- strong reducing agent
4
Q
galvanic cells
A
- chemical -> electrical
- spontaneous (Ecell > 0)
- saltbridge
5
Q
electrolytic cells
A
- electrical -> chemical
- non-spontaneous (Ecell < 0)
- battery provides energy
6
Q
purification of copper
A
- anode: impure
- cathode: pure
- power removes e- from anode
- then forms Cu2+ ions. attracted to cathode
- making almost pure copper
7
Q
whats the use of a salt bridge
A
maintain the flow of ions
8
Q
one property of liquid which is required to make a salt bridge
A
should be soluble in water
will not react
9
Q
concentrated NaCl
A
- 2Cl-
- 2H2O(l)
9
Q
dilute NaCl
A
- both have same reaction
- anode doubled (-0.83)
10
Q
molten NaCl
A
- 2Cl-
- Na+
11
Q
copper nitrate
A
- Ag
- Cu2+
12
Q
copper sulfate
A
- 2H2O
- Cu2+
13
Q
zinc sulfate
A
- Cu
- Zn2+
