bonding and structure and properties of matter

Cards (16)

what is an ionic bond? 
when a metal donates electrons to a non-metal forming opposite charged ions that are attracted to each other
what is a covalent bond? 
a shared pair of electrons between two non-metals
what is a metallic bond?
positive metal ions in a 'sea' of delocalised electrons
what is an alloy? 
a mixture of two or more elements where at least one element is a metal
what will happen when an atom loses an electron
a positive ion will form
what will happen when an atom gains an electron 
a negative ion will form
a giant ionic lattice is a substance made of billions of oppositely charged ions joined together
an ionic bond is formed when a metal reacts with a non metal
covalent bonds are held together by strong electrostatic forces of attraction
what is a property small molecules?
they have low boiling points
diamond has a giant covalent strcuture
polymers have long chained molecules made of non metal atoms covalently bonded together
polymers cannot conduct electricity as theres delocalised electrons to carry the charge
strong intermolecular have high melting points
ions cannot conduct electricity
why does glass melt at lower temperature than silicon dioxide? 
because of the different types of bonds that hold their molecules together.