metals Flashcards
compare the thermal conductivity metals vs non metals
metals- good conductor of heat
non-metals- poor conductor
compare the physical properties of non metals vs metals
metals- maellable, ductile, shiny
non metals- quite brittle, not ductile not maellable
compare the electrical conductivity metals vs non metals
metals- great conductors
non metals- poor conductors
How come metals are able to conduct electricity well?
due to presence of free moving electrons
describe structure of metals
giant 3 dimensional structure in which regular rows of positive ions are surrounded by ‘sea’ of free moving electrons
Explain in terms of structure in metals why they are malleable
this is because the layers of +ive ions can slide over each other making it easy
do metals have low or high m.p and b.p
generally high
how come that metals have generally high m.p and b.p?
because of the strong metallic bonds between molecules
what is the product when we react a metal with oxygen?
a metal oxide
metal+ oxygen—–>?
metal oxide
what are the reactants that create the product of an oxide
metal+oxygen
metal+ cold water——>?
hydroxide+ hydrogen gas
name the metals that can react with cold water
sodium, calcium and potassium
metal+ steam——>?
metal oxide+ hydrogen gas
what is the gas produced when we react a metal with steam?
hydrogen
what is the gas produced when we react a metal with cold water?
hydrogen
metal+acid——>?
salt+ hydrogen
explain the reaction of metals + acids
when they react, hydrogen atom in acid is replaced by metal atom to produce a salt and hydrogen gas
name the gas produced when a metal and an acid react together
hydrogen
what kind of metals do NOT react with oxygen, name two
the unreactive metals; AG and AU, gold and silver
what kind of metals react with oxygen really easily?
alkali metals
Why is aluminium used in the manufacturing of aircraft?
because of it’s low density
Why is aluminium used in the manufacture of overhead
electrical cables?
because of its low density
and good electrical conductivity
Why is aluminium used in food containers?
because of its resistance to corrosion