11 mark
Which solid has a giant covalent lattice structure?
Calcium fluoride
Nickel
Silicon (IV) dioxide
Sulfur
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Bonding & Structure (CIE AS Chemistry)
Exam Questions
2 hours18 questions21 mark
The table shows the physical properties of four substances.
Which substance has a giant ionic structure?
|
melting point /℃ |
boiling point /℃ |
electrical conductivity of solid |
electrical conductivity of liquid |
electrical conductivity of aqueous solution |
|
|
1 |
-119 |
39 |
poor |
poor |
insoluble |
|
2 |
-115 |
-85 |
poor |
poor |
good |
|
3 |
993 |
1695 |
poor |
good |
good |
|
4 |
1610 |
2230 |
poor |
poor |
insoluble |
1, 2 and 3
1 and 2
1 and 3
3 only
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31 mark
Three substances, R, S and T, have physical properties as shown.
Substance |
Melting / oC |
Boiling / oC |
Electrical conductivity of liquid |
|
R |
772 |
1407 |
Yes |
|
S |
114 |
183 |
No |
|
T |
1610 |
2205 |
No |
What type of lattice could each substance have?
|
R |
S |
T |
|
|
A |
Giant molecular |
Simple molecular |
Ionic |
|
B |
Ionic |
Giant molecular |
Simple molecular |
|
C |
Ionic |
Simple molecular |
Giant molecular |
|
D |
Simple molecular |
Ionic |
Giant molecular |
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41 mark
Which diagram represents part of a giant covalent lattice structure?
1, 2 and 3
1 and 2
1 and 3
3 only
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11 mark
Three substances, X, Y and Z, have physical properties as shown.
Substance |
Melting / oC |
Boiling / oC |
Electrical conductivity |
|
|
of solid |
of liquid |
|||
|
X |
801 |
1413 |
Poor |
Good |
|
Y |
2852 |
3600 |
Poor |
Good |
|
Z |
3550 |
4827 |
Good |
Not known |
What could be the identities of X, Y and Z?
|
X |
Y |
Z |
|
|
A |
CaF |
KCl |
Cu |
|
B |
NaCl |
MgO |
C (graphite) |
|
C |
NaBr |
CaO |
C (diamond) |
|
D |
NaBr |
BaO |
SiO2 |
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21 mark
When can sodium chloride conduct electricity?
| Solid | Molten | Aqueous | |
| A | ✓ | ✓ | X |
| B | ✓ | X | ✓ |
| C | X | ✓ | ✓ |
| D | X | X | ✓ |
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31 mark
Which chemical has the highest melting point?
Sulfur
Calcium oxide
Lithium
Sodium fluoride
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11 mark
Which compounds have an ionic lattice structure in the solid state?
|
Silicon dioxide |
Ammonium sulfate |
Potassium iodide |
|
|
A |
✓ |
✓ |
⨯ |
|
B |
✓ |
⨯ |
✓ |
|
C |
⨯ |
✓ |
✓ |
|
D |
⨯ |
⨯ |
✓ |
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21 mark
What properties best describe the structure and bonding present in hydrogen fluoride?
|
Localised covalent bonds |
High solubility in polar solvents |
H-F bond has the lowest bond enthalpy out of Group 7 hydrides |
Highest boiling point out of Group 7 hydrides |
|
|
A |
⨯ |
✓ |
⨯ |
✓ |
|
B |
✓ |
✓ |
⨯ |
✓ |
|
C |
⨯ |
✓ |
✓ |
✓ |
|
D |
⨯ |
⨯ |
✓ |
⨯ |
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31 mark
What is the correct order for the melting points of the following metal oxides?
Na2O > MgO > CaO
MgO > CaO > Na2O
MgO > Na2O > CaO
Na2O > CaO > MgO
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