1. Chemistry 2 Lesson 2.1 Ionic Compounds AQA Additional Science

2. Aims Class work Structures and Properties Ionic Compounds LO’s What are the properties of ionic compounds? Write it down!! Page 48 © C Meyer

3. Chemistry Unit 2 Sections Structures Structures and bonding  and properties  How much? 2 of 7 © C Meyer

4. All Know the main properties of ionic compounds Most/Some Relate their properties to their structure Aims

5. Metals (left side) lose electrons to get a full shell Non metals (right side) gain electrons to get a full shell + and - ions that form strongly attract each other What are ionic bonds? Use sodium chloride as an example What have I learnt?

6. What are ionic bonds? Use sodium chloride as an example (Na =11, Cl = 17) What have I learnt? m2

7. What structure do ionic compounds have/what do they look like? What have I learnt? m1 + - + - -- - + + + - + - + - - ++ + - + - -- - + + + - + - + - - ++ + - + - + - - ++ + - + - -- - + + Lots of ionic bonds + and – attract strongly

8. Background - water, water everywhere What is the formula for water? What does a molecule look like? What are the properties of ionic compounds? O H H O H H Covalent bonds m3

9. You will do a series of experiments For each experiment write a conclusion/say why the ionic compound has that property using your knowledge of ionic bonding What are the properties of ionic compounds?

10. 1.Observation – look at the crystals under a hand lens. What is structure, is it solid, liquid or gas? Why? 2.Scratch test – Take a needle. Try to scratch the surface CARE. Is the surface hard or soft? Why? 3.Melting point – Place a spatula full of the crystals in a boiling tube. Heat in the blue flame CARE. Do they have high or low melting points? Why? 4.Solubility – Take a small beaker, half filled with water. Add 2 spatulas full of crystals. What happens? Why? SAFETY 18 mins 5.Conductivity – Take a small beaker. Put a layer of crystals on the bottom. Dip in the electrodes, does the lamp light? Why? Now add water CARE - Chlorine. Does the lamp light? Why?

11. Tidy UP!!! Stack items tidily Clean up bench/floor Sit down when finished

12. List the main properties of ionic compounds and explain why they have those properties Homework

13. 1.Observation What are the properties of ionic compounds? Solid, crystals – due to strong ionic bond. Particles close and hard to break apart 2.Scratch test Hard, scratch resistant – strong ionic attractive bonds 3.Melting point High melting point. Did not melt (easily) – strong ionic attractive bonds m3

14. What are the properties of ionic compounds? 4.Solubility Easily dissolves – Water is not neutral, has a charge so can attract ions in lattice and pull them apart m1

15. What are the properties of ionic compounds? 5.Conductivity Solid does not conduct. When solution conducts – in solution ions are free to move. They carry a charge so go to the opposite electrode. Ions would also conduct when at very high temperature and molten

16. What are the properties of ionic compounds?

17. The End