Drawing Lewis Structures

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# Drawing Lewis Structures - PowerPoint PPT Presentation

Drawing Lewis Structures. Testing Time. Draw the Lewis Structure of:. Methane (Natural Gas) CH 4. Draw the Lewis Structure of:. Methane (Natural Gas) Number of bonding electrons = 4+1+1+1+1 = 8. H. H. C. H. H. Draw the Lewis Structure of:.

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### Drawing Lewis Structures

Testing Time

Draw the Lewis Structure of:
• Methane (Natural Gas)
• CH4
Draw the Lewis Structure of:
• Methane (Natural Gas)
• Number of bonding electrons = 4+1+1+1+1 = 8

H

H

C

H

H

Draw the Lewis Structure of:

Put a pair of electrons between each H and the C atom to join them

H

H

C

H

H

Draw the Lewis Structure of:

Make sure each hydrogen has 2 electrons around it and the carbon atom has 8 electrons

H

H

C

H

H

NH3 ammonia a smelly but useful gas

There are 5+1+1+1 = 8 electrons

When 6 have been used to join atoms put the other two on the central atom

H

H

N

H

There are 1+1+4+6 = 12 electrons

When 6 have been used to join atoms put the other two on the oxygen atom – to give it 8

H

O

C

H

The C atom only has 6 electrons around it – it wants 8; so the oxygen atom shares 2 with the carbon atom. This makes a “double bond”.

H

O

C

H

Home Work
• Draw the Lewis Diagram for
• Water H2O
• Carbon Dioxide CO2
• Ethyne HCCH
• Carbon Monoxide CO
Ethyne HCCH

Count up the electrons in outer shells

Put a pair of electrons between each atom

Move the rest to the C atoms (Hs have enough)

H

C

C

H

Ethyne HCCH

Share electrons between C atoms

H

C

C

H