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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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draw the lewis structure of
Draw the Lewis Structure of:
  • Methane (Natural Gas)
  • CH4
draw the lewis structure of1
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 of2
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 of3
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

nh 3 ammonia a smelly but useful gas
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

h 2 co methanal a smelly gas used by be a disinfectant germ killer
H2CO methanal a smelly gas used by be a disinfectant (germ killer)

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

slide9

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
Home Work
  • Draw the Lewis Diagram for
  • Water H2O
  • Carbon Dioxide CO2
  • Ethyne HCCH
  • Carbon Monoxide CO
ethyne hcch
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 hcch1
Ethyne HCCH

Share electrons between C atoms

H

C

C

H