Question

please answer this

1. Draw dot and cross diagrams to show the bonding in the following compounds.
a) hydrogen (H 2 )

b) hydrogen chloride (HCl)

c) methane (CH 4 )

d) water (H 2 O)

e) oxygen (O 2 )

Name:……………………………………………………. Date: ……………………

2

2. a) Complete the table below.
Name Formula Melting point
(°C)

Electrical
conductivity

Type of structure

Methane CH 4 -182.5 insulator
Diamond C 3550 insulator giant covalent structure
Water H 2 O 0 simple molecular structure
Sulfur S 8 115 insulator
Graphite C 3652 conductor
Silicon
dioxide

SiO 2 1600 insulator

Using the data in the table, identify the following:
b) simple covalent compounds
………………………………………………………………………………………….……………………
………………………………………………………………………………………….………………
c) elements with giant structures
………………………………………………………………………….……………………………………
………………………………………………………………………………………………….………
d) compounds with giant structures
…………………………………………………………………………………………………….…………
…………………………………………………………………………………………………….……
3. A box of samples of covalently bonded substances has been given to you but the
labels have fallen off. Design a simple experiment to determine which of the
substances have a simple structure and which have a giant structure.
Include a diagram of the equipment you would use.

Name:…………………………………………………….


……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
4. Diamond and graphite are allotropes of carbon. By referring to their bonding and
structure, explain each of the following:

a) why both diamond and graphite have a high melting point
……………………………………………………………………………………………….…….………………………………………………………………………………………………………….….……………………………………………………………………………………………………………….…….
b) why diamond is very hard and graphite is soft
…………………………………………………………………………………………………….………………………………………………………………………………………………………….………………………………………………………………………………………………………………………
c) why diamond acts as an electrical insulator and graphite acts as a conductor of
electricity

………………………………………………………………………………..…………………………………………………………………………………………………………………..………………………………………………………………………………………………………………...………………...…
5. Explain why carbon nanotubes are used in the manufacture of tennis rackets. Include
reference to the structure of the nanotubes in your answer.

…………………………………………………………………………………….……………………………………………………………………………………………………………….……………………………………………………………………………………………….………………………………………………………………………………………………………………………………………………………….
……………………………………………………………………………………………………………….

Answer 1

Answer:

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Answer 2

Answer:

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