1. Kaupapa: 16 / 05 Tuesday Define “compound”
Explain why compounds have different properties to the elements they are formed from

2. Do you remember? Define “element”
Atoms are made of three things. What are they?
How many electrons, protons and neutrons are there in an aluminium atom?

3. Question: What is the chemical name of “salt”?
Answer: Sodium Chloride (NaCl)

4. Sodium Metal

5. Chlorine Gas

6. + =
???

7. Elements and Compounds
Elements are made up of only one type of atom.
Compounds are made up of two or more types of atoms which are chemically combined, created by a chemical reaction.

8. Demo: Aluminium + Iodine

9. Practical: Making a compound
Aim: to produce a compound by chemically combining two elements – iron and sulfur
Method: <diagram here>
Observation:

10. Properties Iron Sulfur Compound (Iron Sulfide) Magnetic Non-magnetic
Sinks in water
Floats on water
Black
Yellow

11. Properties Iron Sulfur Compound (Iron Sulfide) Magnetic Non-magnetic
Sinks in water
Floats on water
Black
Yellow
Brown

12. Q: Why do compounds have different properties from the elements from which they are made?
A: When elements are chemically joined (to become a compound), the atoms lose their individual properties and have different properties as their bonds and structure are changed.

13. Demo: Zinc + Sulfur

14. What have we learnt today?
Define the term “element”
Define the term “compound”