electrochemistry Flashcards
(17 cards)
1
Q
electrolysis
A
decomposition of an ionic compound when molten or in aqueous solution by the passage of electric current
2
Q
electrolyte
A
the molten or aqueous substance that undergoes electrolysis
3
Q
dilute sulfuric acid
A
water electrolysis
4
Q
cathode
A
metals / hydrogen
5
Q
anode
A
non-metals
6
Q
molten
A
only compound ions
7
Q
conc. aq
A
deposit by reactivity
8
Q
conc.
A
compound ions always
9
Q
dilute
A
water always
10
Q
why electroplate
A
- improve appearance
- make resistant to corrosion
11
Q
electroplate half equations
A
opposite
12
Q
electroplate solution
A
solution with plating metal
13
Q
CuSO4
A
- copper: anode dissolves away + cathode bigger + blue stays
- inert (graphite/platinum): hydrogen anode + copper cathode + blue fades
14
Q
halides
A
conc. = always halide
dilute = always hydroxide
15
Q
hydrogen-oxygen fuel cell
A
uses hydrogen and oxygen to produce electricity with water as the only waste product
16
Q
advantage of h.o.f.c
A
- renewable energy
- non-polluting
17
Q
disadvantage of h.o.f.c
A
- low availability of hydrogen
- low density so hydrogen difficult to store
