chemistry 2 lesson 1.6 metallic bonding aqa additional science
TRANSCRIPT
Aims
Class work Bonds in Metals
LO’s• How do metals bond?
Write it down!! Page 46© C Meyer
All• Know how atoms in metals are
arranged
Most• List elements with giant metallic
structures
Some• Explain how delocalised electrons hold
metal atoms together
Aims
In back• List 5 metal symbols• List 4 metal properties• List 3 magnetic metals• List 2 metals used in jewellery• List 1 liquid metal at room
temperature
How do metals bond?
Growing metal crystalsExpt 1• Take a boiling tube• Quarter fill with silver nitrate solution• Place a strip of copper wire in the solutionExpt 2• Take another boiling tube• Quarter fill with lead nitrate• Place a strip of zinc foil in the solution• Leave until end of lesson and observe crystals
with hand lens
SAFETYChemicals - goggles
10 mins
How do metals bond?
Tidy UP!!!
• Stack items tidily• Clean up bench/floor• Sit down when finished
• Metals grow as crystals (grains)
How do metals bond?
How do metals bond?
• Metal atoms form a giant lattice similar to ionic compounds.
• Grains grow with atoms coming together in ordered patterns
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Types of bonding
Atoms can be joined together in 3 possible ways
All three types involve changes in the electrons in the outermost electron shells of the atoms
Ionic Bonding
Metal and non-metal
Covalent Bonding
Non-metals only
Metallic Bonding
Metals only
• Outer electrons are free to move all over the lattice in a “sea of electrons” (delocalised).
• This leaves metal atoms with a + charge.
• Attraction between - and + acts like a glue
How do metals bond?
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What have I learnt?
What type of bonding will the substances have?
Substance Bonding
Brass (Alloy copper + zinc)
Copper oxide
Sulphur dioxide
Iron
Sodium fluoride
Nitrogen chloride
Metallic
Ionic
Covalent
Metallic
Ionic
Covalent
What have I learnt?
Which of the following will have covalent bonding?
A. Sodium chloride
B. Iron
C. Bronze
D. Nitrogen dioxide
What have I learnt?
Which of the following will have metallic bonding?
A. Copper chloride
B. Graphite
C. Bronze
D. Phosphorus chloride
What have I learnt?
Which is a true statement about covalent bonds?
A. Usually formed between metals and non- metals
B. Involve transfer of electrons between atoms.
C. Form full electron shells by sharing of electrons.
D. Always involve 2 electrons per atom.
What have I learnt?
Which of the following exists as a giant molecular structure?
A. Water
B. Carbon dioxide
C. Sodium chloride
D. Diamond
What have I learnt?
What will be the formula of the compound formed by hydrogen and sulphur?
A.HS
B.H2S
C.HS2
D.H2S2
32
S16
1
H1
1 2.8.6
What have I learnt?
• Next lesson end of section test• Prepare a spider diagram/mind
map of all the key facts from this section
• Finish for homework and revise
How do metals bond?
Homework
The End