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10 minutes maximum
An IB Periodic Table is required. |
1. Which of the following is NOT a macromolecule?
- A. diamond
- B. C60 fullerene
- C. silicon dioxide
- D. graphite
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2. Which row correctly shows the number of atoms directly bonded to each carbon atom in the named structures?
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Graphite |
Diamond |
Graphene |
C60 Fullerene |
| A |
3 |
4 |
3 |
3 |
| B |
3 |
4 |
3 |
4 |
| C |
4 |
3 |
4 |
4 |
| D |
4 |
3 |
3 |
3 |
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3. Which statement is true for diamond?
- A. Each carbon is held in a tetrahedral arrangement
- B. It has weak London forces between layers
- C. Carbon atoms are bonded by strong ionic bonds
- D. It is a soft substance
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4. Which statements about graphite are correct?
I. It conducts electricity as it contains delocalized electrons
II. It has a low melting point as the layers are easily separated
III. It can be used as a lubricant as its layers slide easily over each other |
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- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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5. Diamond, graphite, graphene and C60 buckminsterfullerene are ...
- A. Isomers
- B. Allotropes
- C. Isotopes
- D. Hydrocarbons
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6. Which statement about silicon is NOT true?
- A. All Si-Si-Si bond angles are 109.5°
- B. Silicon does not conduct electricity
- C. Each silicon atom is bonded covalently to 3 other silicon atoms
- D. Silicon has a high melting point as all the bonds are strong
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7. Which statements about graphene are correct?
I. Graphene is a good electrical conductor
II. Carbon atoms in graphene are arranged in a single, planar layer of hexagons
III. Graphene has a giant covalent structure |
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- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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8. Which row gives the correct bonding present and melting point in carbon dioxide and silicon dioxide?
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Carbon dioxide |
Silicon dioxide |
| A |
covalent |
low mpt |
covalent |
low mpt |
| B |
covalent |
high mpt |
ionic |
high mpt |
| C |
ionic |
high mpt |
ionic |
low mpt |
| D |
covalent |
low mpt |
covalent |
high mpt |
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9. Which substance has a high melting point and conducts electricity in the solid state?
- A. graphite
- B. magnesium oxide
- C. silicon dioxide
- D. sodium
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10. Which statement is true for silicon dioxide, SiO2?
- A. It consists of small molecules
- B. The O-Si-O bond angles are 180°
- C. It is insoluble in water
- D. Each Si atom is covalently bonded to 2 oxygen atoms
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