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 metalsMost• Explain why metals have their

propertiesSome• 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

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 arefree to move all

overthe lattice in a

“sea of electrons” (delocalised).

Delocalised electronswill move to conductelectricity (and heatrapidly)

What have I learnt?

Complete the Table and fill in the blank columns.

YesYesLowNoE

Small or giant?

Yes

No

No

Yes

Conduct when

molten

NoHighNoD

NoHighNoC

NoLowYesB

YesHighNoA

Metal

Ionic

Small Mol

Giant Mol

Conduct as solid

Melting Point

Soluble in petrol

Giant Metal

Small Small 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?

MetalGiant

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