Metals Flashcards
properties of metals
C M S C M D S
good conductors of electricity
malleable
shiny
conductors of heat
high melting points
sonorous
ductile
what are the exceptions to these properties?
alkaline metals have low melting points and are not sonorous
mercury has a low melting point
metals are ____ _____ with high ______ and ______ points.
giant structures with high melting and boiling points
how do metals form their sea of electrons?
they form positive ions called cations. the electrons they give up form a sea of electrons surrounding the positive metal ions, and the negative electrons are attracted to the positive ions, holding the structure together
why are metals good conductors?
because their delocallsed electrons are free to move through the structure.
why are metals malleable and ductile?
metallic bonds are not as rigid as the bonds in diamond, for example. so the ions can move around into different positions when the metal is hammered or worked
what is galvanising?
covering iron with zinc to prevent it from corroding
there are strong _______ ________ between _____ and _________ ________
electrostatic forces between ions and delocalised electrons
why are metals malleabld?
the ions are arranged in layers and can move past each other
why are alloys harder than metals?
because the ions are not arranged in layers, which means that the ions cannot slide over each other as easily
brass ingredients and uses
copper + zinc
instruments, decoration on houses, vases
duralmin
aluminium + copper
airframe fabrication
cast iron
iron carbon
pans and cooking utensils
mild steel
iron and small percent of carbon
used in building
stainless steel
10.5% chromium and iron to produce thin layer of oxide to prevent corrosion
cutlery
