Compounds

What are compounds? We already know what an element is. A single type of atom in a molecule is an element, but when we put two or more different types of elements together they form a Compound.

Water is a compound, because its made of Oxygen and Hydrogen molecules.

These Oxygen and Hydrogen atoms are strongly bonded together.

When in water the water molecules are held close to each other by weak bonds. These bonds between molecules are easily broken when heated.

Have you ever eaten salt?

Salt is a compound. There are many different types of salts, but the one you eat and is in the sea water, is Sodium Chloride.

This salt molecule is made of a Sodium atom and a Chlorine atom.

On its own, Sodium is a shiny metal, while chlorine is a poisonous green gas, but salt isn’t shiny or poisonous.  

When atoms are joined they, develop different properties to their original elements.

Questions

To answer the questions bellow, think about the elements on the periodic table. Match the words that make up the molecule with possible elements on the table.

1. What are the elements in a water molecule?

2. What are the elements in Sulphuric Acid?

3. What are the elements in Zinc Chloride?

4. What are the elements in Magnesium Sulphate?

5. What are the elements which make up Carbon Dioxide

6. Define what a compound is

7. Fill in the blanks:

   Water is a combination of 2 _______ atoms and 1 ________ atom. These        atoms are ___________ bonded to each other. The actually water molecules    have a ________ attraction to each other.

8. Research and compare the properties of Hydrogen, Oxygen and water.

9. What is the best way to get salt from salty water?

10. List 3 elements and 3 compounds