8.3 Group VII Properties (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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- FrontGroup VII Properties
As you go down Group VII, the melting and boiling points ______, the density ______ and the reactivity ______.
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As you go down Group VII, the melting and boiling points ______, the density ______ and the reactivity ______.
As you go down Group VII, the melting and boiling points increase, the density increases and the reactivity decreases.
Complete the table with the state and colour of the Group VII element.
Element
State at room temperature
Colour at room temperature
chlorine
bromine
iodine
Element
State at room temperature
Colour at room temperature
chlorine
gas
pale yellow-green
bromine
liquid
red-brown
iodine
solid
grey-black
What is a halogen?
A halogen is a Group VII diatomic non-metal element with 7 outer electrons. Halogens are poisonous and include fluorine, chlorine, bromine and iodine.
True or False?
Aqueous iodine solution is purple.
False.
Aqueous iodine is brown, not purple. Iodine vapour is purple and solid iodine is grey-black.
The reactivity of Group VII elements ______ as you go down the group. This is the ______ trend to Group I.
The reactivity of Group VII elements decreases as you go down the group. This is the opposite trend to Group I.
Why does reactivity decrease as you go down Group VII?
Going down Group VII, each element has more electron shells, so the outer shell is further from the nucleus. The atom gains an electron less easily, so reactivity decreases.
What is a halogen displacement reaction?
A halogen displacement reaction occurs when a more reactive halogen displaces a less reactive halogen from an aqueous solution of its halide salt.
When chlorine is added to potassium bromide solution, the solution turns ______ as ______ is produced.
When chlorine is added to potassium bromide solution, the solution turns orange as bromine is produced.
True or False?
Iodine solution will displace bromide ions from potassium bromide solution.
False.
Iodine is less reactive than bromine, so it cannot displace bromide ions. Only a more reactive halogen can displace a less reactive one.
When bromine is added to potassium iodide solution, the solution turns ______ as ______ is produced.
When bromine is added to potassium iodide solution, the solution turns brown as iodine is produced.
Place chlorine, bromine and iodine in order of decreasing reactivity and explain the trend.
Chlorine > bromine > iodine.
Reactivity decreases down Group VII as the outer electrons are further from the nucleus and the attraction for an incoming electron becomes weaker.
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