Transitional Metals Flashcards
where are transitional metals found
they are between groups 2 and 3
what are 2 physical properties of transitional metals
high melting point
high density
what are 2 chemical properties of transitional metals
form coloured compounds
catalytic activity
what causes the corrosion of metals
oxidisation
what is the name given to the corrosion of iron and steel
rusting
what 2 factors does rusting need
water and air
what are some rusting prevention methods that prevent both water and air
painting
using oil/grease
coating with plastic
coating with other metal
what are some rusting prevention methods that keep just oxygen away
store items in a vacuum
what are some rusting prevention methods that keep just water away
put it in a container with desiccant which will absorb water vapour
what is electroplating
covering a metal with a thin layer of an unreactive metal to keep air and water out
what are 2 purposes of electroplating
improve appearance
improve resistance to corrosion
what is galvanising
a method of sacrificial protection that covers a metal with a more reactive one so that it will become rusted instead
what is an alloy
a mixture of a metal with one or more other elements.
what is steel
an alloy made with iron and carbon
what is stainless steel
an iron alloy that contains chromium which forms an invisible layer of chromium oxide which stops air and water from reaching the iron
