11 mark
Which substance has a giant lattice of atoms?
diamond
ice
poly(ethene)
sodium chloride
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1.7 Covalent Bonding & Structure
21 mark
Which molecule is planar?
CF4
C2F4
PF5
SF6
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11 mark
The hydrogen ion, H+, bonds to a water molecule forming an H3O+ ion.
For H3O+, what shape and H-O-H bond angle are predicted by the electron-pair repulsion theory?
trigonal planar 120°
trigonal planar 117.5°
trigonal pyramidal 107°
trigonal pyramidal 104.5°
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21 mark
Which of these molecules is not polar?
CO2
HCl
H2O
NH3
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31 mark
Which row gives the correct polarities of the S—F bond and the SF6 molecule?
(1)
| Polarity of S—F bond | Polarity of SF6 molecule | |||
| ☐ | A | polar | polar | |
| ☐ | B | polar | non-polar | |
| ☐ | C | non-polar | polar | |
| ☐ | D | non-polar | non-polar |
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41 mark
Which compound has bonds that are the most polar?
H2O
H2S
NH3
PH3
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51 mark
Which of these molecules is the most polar?
HF
OF2
BF3
CF4
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