5.4 what are the properties of metals and alloys Flashcards
(12 cards)
what is the metallic bond
the metallic bond is the mutual electrostatic attraction between positively charged ions and the ‘sea of delocalised electrons’
alloy
a mixture of a metal with one or more elements
structural properties of pure metals
pure metals have a regular structure and if enough force is applied, the layers of atoms can slide over one another easily
structural properties of alloys
atoms of different elements disrupt the regular arrangement thus atoms of different sizes cannot slide over each other easily
why are pure metals known to be malleable
when hammered, pure metals can be bent or flattened into a thin sheet
melting points and boiling points of metals
metals usually have a high melting and boiling point because the metals are held together in a lattice by strong metallic bonds
melting and boiling points of alloys
they usually melt over a range of temperatures as they are mixtures
metals and alloys are __ conductors of heat
good
why are metals and alloys good conductors of heat
the delocalised valence electrons allow efficient transfer of thermal energy throughout the giant metallic structure
metals and alloys are __ conductors of electricity
good
why are metals and alloys good conductors of electricity
the ‘sea of delocalised electrons’ found in them makes them good conductors
why are pure metals ductile
they can be pulled into a wire without breaking
