Chemistry 2 Lesson 2.4 Giant Metallic Structures AQA Additional Science

Aims Class work Bonds in Metals LO’s Why do metals have their properties? Write it down!! Page 46 © C Meyer

All Know how metal atoms are put together Know the properties of metals Most Explain why metals have their properties Some Explain how metals conduct electricity Aims

Metals vs. Non-metals What are the properties of metals?

Metals vs. Non-metals What are the properties of metals?

Why do metals have their properties? What are the properties of metals? m1

Metal Structure Take ping pong ball rafts Place a set as the first layer Sit a second layer on the first Sit a third layer either Over the first Or With their centres not in line with the first layer 10 mins Why do metals have their properties? Understanding their structure should help explain their properties

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

Gold/copper Zinc/nickel Why do metals have their properties? Metal atoms form a giant lattice similar to ionic compounds.

Metals are not brittle. The metal atoms are the same and exist in simple structures. If something hits the substance, it simply moves to the next layer along. Again, like layers of paper. This is why they are ductile. Blow Bonding and physical properties Copy diagram and note why metals are ductile m3

Take a petri dish Add some soap solution Use a pipette to blow small bubbles and fill the petri dish What do the atoms do? What happens if you GENTLY squeeze the walls of the petri dish What happens if you put a big bubble in the rows? Why do metals have their properties? 10 mins Lets make a different atom model to see how the atoms move as the metal is deformed

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

How do metals bond? m2 Why do metals conduct? Outer electrons are free to move all over the lattice in a “sea of electrons” (delocalised). Delocalised electrons will move to conduct electricity (and heat rapidly)

What have I learnt?

Complete the Table and fill in the blank columns. Yes LowNoE Small or giant? Yes No Yes Conduct when molten NoHighNoD HighNoC LowYesB HighNoA Metal Ionic Small Mol Giant Mol Conduct as solid Melting Point Soluble in petrol GiantMetal SmallSmall Mol Giant Giant Mol Giant Ionic Substance E is peculiar: Can you suggest an actual substance that E could be? Can you explain the low melting point? Metal Giant Activity Substance

Which of these will conduct as both solid and liquid? A. metal B. ionic C. small molecules D. giant molecules What have I learnt?

Which of these will conduct when liquid but not when solid? A. small molecules B. giant molecules C. metal D. ionic What have I learnt?

Which of these will not conduct at all and is hard to melt? A. small molecules B. giant molecules C. metal D. ionic What have I learnt?

Which of these will conduct as both solid and liquid? A. metal B. ionic C. small molecules D. giant molecules What have I learnt?

Which of these will conduct when liquid but not when solid? A. small molecules B. giant molecules C. metal D. ionic What have I learnt?

Which of these will dissolve in solvents like petrol? A. small molecules B. giant molecules C. metal D. ionic What have I learnt?

Which of these will not conduct at all and is hard to melt? A. small molecules B. giant molecules C. metal D. ionic What have I learnt?

The End