metal Flashcards
why iron nails rust faster when stored in acidic environment
electrical conductivity of the solution increases due to the presence of electrolyte.
speed up the loss of electrons
why aluminium corrodes much slower than iron
aluminium has an impermeable layer of oxide which prevents the metal from further corrosion
why iron nail is protected against corrosion by electroplating with copper
protect the nail from contact with water and air
name the major ore of aluminium that contains aluminium oxide
bauxite
why having magnesium ribbon on iron nail will prevent rust
As magnesium is higher than iron in the metal reactivity series, the magnesium ribbon protects the iron nail from rusting by sacrificial protection.
why add lead to soldering materials
to lower the melting point of the soldering metal
Fe2+ + rust indicator K3Fe(CN)6 color?
blue
why aluminium rather than iron is used for making the top of the can and the ring pull
Al is softer than iron so the ring pull can be pulled off more easily
how to show Al is more reactive than iron
Add Al metal to Fe2+ solution, metal deposit or green Fe2+ fades
what is the usage of coke in extraction or iron
reducing agent
what is the observation when copper is formed
reddish brown powder formed
what is the name of magnesium alloys
duralumin
what is the use of anodisation
to increase the thickness of the oxide layer thus increasing the corrosion resistance of aluminium
what is the use of magnesium in daily life
firework/making alloy/ sacrificial protection
state one advantage of using aluminium to make cans than iron
it has a low density
XXXXXX lighter
