Unit 5 Flashcards
1
Q
properties of transition metals
A
- high melting points
- high densities
- form colour compounds
- catalysts
2
Q
why alloys are stronger
A
different elements have different sized atoms which distorts the layers, so they cant slide
3
Q
steel
A
- carbon and pure iron
- harder and stronger
- doesn’t rust as easily
4
Q
corrosion
A
- redox reaction
- metals are oxidised
- oxygen is reduced
5
Q
rusting prevention
A
- coating iron with a barrier
- oiling/greasing
- painting
6
Q
sacrificial protection
A
placing a more reactive metal with iron so it corrodes instead
7
Q
galvanising
A
zinc is put with iron and loses electrons
8
Q
electroplating
A
cathode = object you're electroplating anode = metal used electrolyte = metal ions of the metal you're plating
9
Q
percentage yield
A
actual yield/theoretical yield x 100
10
Q
factors affecting yield
A
- incomplete reactions
- practical losses
- unwanted reactions
11
Q
atom economy
A
total Mr of desired products / total Mr of all products x 100
12
Q
moles
A
vol/1000 x concentration
13
Q
concentration
A
moles x 1000/volume
14
Q
cm3 - dm3
A
/ 1000
15
Q
moldm-3 - gdm-3
A
x Mr
