Paper 1 - 1/2 Flashcards
What is an ion?
An ion is formed when an atom gain or losses electrons. Ions are charged particles.
What is ionic bonding?
Ionic bonding is the transferring of electrons from the outer shell of a metal atom to the outer shell of a non-metal atom.
State the properties of ionic compounds.
High melting & melting point.
Strong electrostatic forces of attraction.
Form giant ionic lattices.
They dissolve in water.
They can conduct electricity when molten or dissolved due to the ions being able to move.
What is covalent bonding?
Covalent bonding is the sharing of a pair or pairs of electrons between non-metals atoms.
Describe the bonding in metals.
Strong electrostatic attraction between the negatively charged electrons and positive ions.
Give properties of metals.
Can conduct electricity - the electrons transfer the current.
Good conductor of heat.
Solid at room temperature.
The atoms can also SLIDE over each other, making metals malleable.
What is a polymer?
Polymers are long chains of repeating units made up from smaller molecules called monomers.
Why are metals good conductors of electricity?
This is because their outer electrons are not attached to any particular atom. Instead they are able to move between atoms. They are called FREE delocalised ELECTRONS.
