Chemistry 2 Lesson 1.6 Metallic Bonding AQA Additional Science

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 crystals Expt 1 Take a boiling tube Quarter fill with silver nitrate solution Place a strip of copper wire in the solution Expt 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 SAFETY Chemicals - 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?

Metal atoms form a giant lattice similar to ionic compounds. Grains grow with atoms coming together in ordered patterns m1

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? m1

What have I learnt?

What type of bonding will the substances have? SubstanceBonding 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.H 2 S C.HS 2 D.H 2 S 2 32 S 16 1H11H 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