Bromine is an element in Group VII of the Periodic Table. Write the formula for a molecule of bromine,
A teacher placed a small amount of liquid bromine in the bottom of a scaled gas jar of air. After two
minutes, brown fumes were seen just above the liquid surface. After one hour the brown colour had spread
completely throughout the gas jar.
liquid
bromine
start
after 2 minutes
after 1 hour
Use the kinetic particle theory to explain these observations.
Magnesium salts are colourless but Group VII elements are coloured.
An aqueous solution of magnesium bromide reacts with an aqueous solution of chlorine.
magnesium bromide + chlorine → magnesium chloride + bromine
State the colour change in this reaction.
A solution of magnesium bromide will not react with iodine. Explain why there is no reaction.
The structures of some compounds containing bromine are shown below.
D
Na
Br. Na
Br
Br
Br
BE
Br
H--Br
Br
Na Br
Zn
Na
Zn
Br
Na
Br
Na
Br
Zn2
Zn
Br
Na Br- Na
i Write the simplest formula for the substance with structure A.
ii State the name of the substance with structure D
ili State the type of bonding within a molecule of structure C.
iv Which two structures are giant structures?
3 dimensional structure
Why does structure A conduct electricity when it is molten?
aromso. net
coralent
(Cambridge IGCSE Chemistry 0620/2, Question 6(0,C-7) June 20
Chapter 3: Elements and comp