Molecular Models Worksheet Page 8
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1
2
3
4
5
6
7
8
9one / the carbon (atom)
reject molecules once
four hydrogen (atoms)
shape / properties neutral
CH
4
hydrocarbon
saturated / single bond
covalent bond / shared electrons
alkane
reject ionic bond
3
[6]
M4.
answers apply to:
accept diagrams and/or descriptions
carbon dioxide CO
2
ammonia NH
3
methane CH
4
water H
O
2
*outer electronic structure of one atom correct or needs
correct number of electrons to complete outer shell
1
*outer electronic structure of other atom correct or needs
correct number of electrons to complete outer shell
1
*one shared pair of electrons (as one covalent bond)
use of ions or reference to ionic bonding negates this mark
1
*outer electronic structure of compound correct or each atom now
has a full outer shell/noble gas electron structure
Page 8
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