Structure and Bonding Flashcards
Define a compound
Two or more elements which are chemically combined
What is the special group of elements that are stable and extremely unreactive?
The noble gases
When atoms share electrons what type of bonding is this?
Covalent
When atoms permanently give electrons what type of bonding is this?
Ionic
In ionic bonding when atoms lose or gain electrons they create particles called __________
Ions
During ionic bonding what happens to the protons?
There is one more proton in the nucleus than electrons around on the outer shell
When non metals react with metals which one gains electrons and why?
The non metal atom gains electrons to get a full outer shell
Which bond is it when a group 7 element steals an electron from a group 1 element?
Ionic bond
What does metallic bonding contain
a delocalised cloud of electrons
What are delocalised electrons?
free electrons
What type of force holds the ions together in an ionic compound?
electrostatic forces of attraction
Why do ionic compounds have a high boiling and melting point?
They take lots of energy to break up
Why can’t a solid ionic compound conduct electricity?
It’s ions are held in a fixed position and can’t move around
What force is between molecules in covalent bonding?
intermolecular forces
What are diamond and silicone both examples of?
strong covalent structures
Give three properties of strong covalent structures
Hard
High melting and boiling points
Insoluble in water
Why do the layers in Graphite slide over so easily?
There are weak intermolecular forces between they layers
What can we make with chemicals from crude oil?
polymers
What joins together to make polymers?
monomers
What do the properties of a polymer depend on?
The monomers used
The conditions chosen
What types of two polyethene are there?
HD and LD (Density)
Why are both types of polyethene different?
They are made in different conditions