The properties of covalent compounds

L.O:

To understand the properties of simple covalent compounds

What properties do all of these substances have in common?

H2

O2

H2O

CH4

NH3

N2

Cl2

What do you observe when iodine is heated?

Can you explain what happens?

Covalent Compound Properties• Bonding within covalent molecules is strong• Forces between molecules are weak• E.g. iodine has weak intermolecular forces

which are easily overcome – iodine sublimes at 30°C

• Fragrances are another example of covalently bonded molecules

• All simple molecules have relatively low melting points and boiling points

• Simple molecules do not conduct electricity

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Properties of simple covalent molecules

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Covalent bonds – true or false?

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Multiple-choice quiz