Questions from past papers Flashcards
(10 cards)
1
Q
Explain why diamond is hard(3)
A
- each carbon atom is covalently bonded to four other carbon atoms
- in a giant covalent structure
- which has strong covalent bonds
2
Q
Explain why graphite conducts electricity(3)
A
- each carbon atom form three bonds
- electron per atom
- delocalised electrons move through the structure
3
Q
What does a ‘redox reaction’ mean
A
oxidation and reduction happen at the same time
4
Q
what are soluble hydroxides called
A
alkalis
5
Q
Why do thermosoftening plastic have a low melting point (2)
A
- weak intermolecular forces
- easily overcome by heating
6
Q
why does the Haber process not produce a 100% yield of ammonia
A
- reaction is reversible
- reaction reaches equilibrium
- ammonia/products reacts to form hydrogen and nitrogen
7
Q
Explain why Graphite is a good conductor of heat. Give your answer in terms of structure and bonding. (3)
A
- each carbon/atom forms three bonds
- so one electron per carbon atom is delocalised
- delocalised electrons move through the structure transferring energy
8
Q
what are the uses for fullerene (1)
A
- drug delivery
- catalyst
- reinforcing materials
9
Q
what is meant by a closed system (1)
A
no reactants / products can enter/ leave the system.
10
Q
A
