11 markeasy
Which substance has a giant lattice of atoms?
Choose your answer
diamond
ice
poly(ethene)
sodium chloride
Chemistry
8 questions · 8 marks · ≈ 8 min
Which substance has a giant lattice of atoms?
Choose your answer
diamond
ice
poly(ethene)
sodium chloride
Which molecule is planar?
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CF4
C2F4
PF5
SF6
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?
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trigonal planar 120°
trigonal planar 117.5°
trigonal pyramidal 107°
trigonal pyramidal 104.5°
Which of these molecules is not polar?
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CO2
HCl
H2O
NH3
Which row gives the correct polarities of the S—F bond and the SF6 molecule?
(1 mark)
| Polarity of S—F bond | Polarity of SF6molecule | ||
|---|---|---|---|
| ☐ | A | polar | polar |
| ☐ | B | polar | non-polar |
| ☐ | C | non-polar | polar |
| ☐ | D | non-polar | non-polar |
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Which compound has bonds that are the most polar?
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H2O
H2S
NH3
PH3
Which of these molecules is the most polar?
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HF
OF2
BF3
CF4
What is the shape and bond angle of an ammonia (NH3) molecule?
| {align=center} | Shape | Bond angle |
|---|---|---|
| A | Trigonal planar | 120° |
| B | Pyramidal | 109.5° |
| C | Pyramidal | 107° |
| D | Tetrahedral | 109.5° |
Choose your answer