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- 1. Multiple Choice
The ‘lead’ in pencil is made of a mixture of graphite and clay.
If the percentage of graphite is increased, the pencil slides across the paper more easily.
Why is this?
Graphite conducts electricity.
Graphite is a form of carbon.
Graphite is a lubricant.
Graphite is a non-metal.
- 2. Multiple Choice
The diagram shows a structure of a substance.
What is represented?
diamond
silica
graphite
ethane
- 3. Multiple Choice
The diagrams show the structures of two forms, P and Q, of a solid element.
What are suitable uses of P and Q, based on their structures?
use of solid P: drilling
use of solid Q: drilling
use of solid P: drilling
use of solid Q: lubricating
use of solid P: lubricating
use of solid Q: drilling
use of solid P: lubricating
use of solid Q: lubricating
- 4. Multiple Choice
Rescuers are drilling through fallen rock in order to rescue some men trapped in a cave. The drill needs lubricating from time to time.
The following statements were made about the materials used for the drill tip and the lubricant and the reasons for their use.
Which statements are correct?
Diamond was used for the drill tip as it does not conduct electricity.
Diamond was used for the drill tip as it is very hard.
Graphite was used as the lubricant as it conducts electricity.
Graphite was used as the lubricant as it is soft and flaky.
- 5. Multiple Choice
Graphite is a form of carbon.
Why can graphite be used as a lubricant?
Graphite contains delocalised electrons which move throughout the structure.
Graphite contains weak covalent bonds so the atoms move easily.
Graphite has a low melting point so it easily turns into a liquid.
Graphite has weak forces of attraction between layers so they can move.
- 6. Multiple Choice
Which statements are correct about diamond and graphite?
They are different solid forms of the same element.
They each conduct electricity.
They have atoms that form four equally strong bonds.
- 7. Multiple Choice
Which substance is not a macromolecule?
diamond
graphite
silicon (IV) oxide
sulfur
- 8. Multiple Choice
Which substances have similar structures?
diamond and graphite
diamond and silicon(IV) oxide
graphite and poly(ethene
graphite and silicon(IV) oxide
- 9. Multiple Choice
How many silicon atoms are bonded to each oxygen atom in a crystal of silicon(IV) oxide?
1
2
3
4
- 10. Multiple Choice
Which statement about graphite and diamond is correct?
Diamond has a high melting point but graphite does not.
Graphite and diamond both conduct electricity.
Graphite and diamond both have giant structures.
Graphite is ionic and diamond is covalent.
- 11. Multiple Choice
Which statements are correct about diamond, graphite and silicon(IV) oxide?
Diamond and graphite both have giant covalent structures.
In silicon(IV) oxide, silicon and oxygen atoms are joined together by covalent bonds throughout the whole structure.
Diamond and silicon(IV) oxide have similar structures.
- 12. Multiple Choice
Two statements about silicon(IV) oxide are given.
1 It is a hard substance.
2 It has a macromolecular structure with strong covalent bonds.
Which is correct?
Both statements are correct and statement 2 explains statement 1
Both statements are correct but statement 2 does not explain statement 1.
Statement 1 is correct but statement 2 is not correct.
Statement 2 is correct but statement 1 is not correct.
- 13. Multiple Choice
Choose statement that describes silicon(IV) oxide?
Silicon(IV) oxide has a giant structure.
Silicon(IV) oxide is an acidic oxide.
Silicon(IV) oxide conducts electricity
- 14. Multiple Choice
Diamond is extremely hard and does not conduct electricity.
Which statement explains these properties?
It has a lattice of positive carbon ions in a ‘sea of electrons’.
It has delocalised electrons and each carbon atom forms three covalent bonds with other carbon atoms.
It has no delocalised electrons and each carbon atom forms four covalent bonds with other carbon atoms.
It has strong ionic bonds between each carbon atom.
- 15. Multiple Choice
Graphite and diamond are both forms of the element carbon.
Which option shows the number of other carbon atoms that each carbon atom is covalently bonded to in graphite and diamond?
graphite: 3
diamond: 3
graphite: 3
diamond: 4
graphite: 4
diamond: 3
graphite: 4
diamond: 4
- 16. Multiple Choice
Which substance is a macromolecule?
ammonia
carbon dioxide
diamond
water
- 17. Multiple Choice
Diamond and silicon(IV) oxide both have giant structures.
Which statements are correct?
Silicon(IV) oxide is bonded ionically.
Both substances are compounds.
There are strong covalent bonds in diamond.
Both substances have very high melting points.
- 18. Multiple Choice
Which statement describes the attractive forces between molecules (intermolecular forces)?
They are strong covalent bonds which hold molecules together.
They are strong ionic bonds which hold molecules together.
They are weak forces formed between covalently-bonded molecules.
They are weak forces which hold ions together in a lattice.
- 19. Multiple Choice
Graphite is a form of carbon.
Why can graphite be used as a lubricant?
Graphite contains delocalised electrons which move throughout the structure.
Graphite contains weak covalent bonds so the atoms move easily.
Graphite has a low melting point so it easily turns into a liquid.
Graphite has weak forces of attraction between layers so they can move.
- 20. Multiple Choice
Diamond and graphite are both macromolecules.
Which statement is NOT correct?
Diamond and graphite contain carbon atoms only.
Diamond and graphite contain charged ions.
Diamond and graphite have high melting points.
The atoms in diamond and graphite are held together by covalent bonds.
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