Compounds.

Question 1

What is a chemical bond?

Answer 1

When different elements react with other atoms to form compounds.

It is usually difficult to seperate the two elemts out again.

Question 2

What does making bonds involve?

Answer 2

Atoms giving away, taking or sharing electrons.

Question 3

What does a compound formed from a metal and non metal consist of?

Answer 3

Ions.

• The metal atoms lose electrons to form positive ions.
• The non metals atoms gain electrons form a negative ions.
• The opposite charges (positive and negative) of the ions mean they’re strongly attracted to eachother. This is called ionic bonding.

Eg. A sodium atom gives an electron to a chlorine atom.

Question 4

What does a compound from formed from non-metals consist of?

Answer 4

Molecules.

• Each atom shares an electron with another atom- this is called a covalent bond.
• Each atom has to make enough covalent bonds to fill up the outer shell.

Question 5

What are the properties of compounds?

Answer 5

• Properties of compound are different to those of elements.

Example:

If iron and sulphur react, the compound formed (iron sulfide) is a dull grey solid lump and doesnt behave anything like sulphur or iron.

• Compounds can be small molecules like water or a lattice like sodium chloride.

Green= Chlorine Pruple= Sodium