C4e: The Group 7 Elements

This item studies the properties of the Group 7 elements. The item links the similarity of their properties to the position of the elements in the Periodic Table. Researching the properties of the halogens allows the use of ICT as a teaching and learning tool. 

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What are the Group 7 elements also known as?
The halogens.
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Name four group 7 elements.
Fluorine, Chlorine, Bromine and Iodine
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What are the three uses of chlorine?
To sterilise water, to make plastics and pesticides.
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What is the use of iodine?
To sterilise wounds.
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Which group do the halogens react vigorously with?
Group 1 (The alkali metals)
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What happens to reactivity as you go down group 7?
It decreases
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What is the metal halide of fluorine?
Fluoride
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What is the metal halide of chlorine?
Chloride
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What is the metal halide of bromine?
Bromide
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What is the metal halide of iodine?
Iodide
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What is the physical appearance of chlorine at room temperature?
A green gas
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What is the physical appearance of bromine at room temperature?
Orange liquid
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What is the physical appearance of iodine at room temperature?
Grey solid
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Which metal halide(s) does chlorine displace?
Bromides and iodines
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Which metal halide(s) does bromine displace?
Iodides
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What happens in a displacement reaction?
If a reactive element comes into contact with the compound of a less reactive element a chemical reaction may take place. The less reactive element is removed from the compound and replaced by the more reactive element.
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When iodine is warmed, what does it form?
A purple vapour.
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What does sodium react with chlorine to produce? Word equation and Balanced symbol equation
Sodium Chloride, Sodium + Chlorine = Sodium Chloride, 2Na + Cl˅2 → 2NaCl
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Word equation for: Chlorine and Sodium Bromide
Chlorine + sodium bromide = sodium chloride + bromine
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Word equation for: Chlorine and Sodium Iodide
Chlorine + sodium iodide = sodium chloride + iodine
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Word equation for: Bromine and Sodium Chloride
No reaction
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Word equation for: Bromine and Sodium Iodide
Bromine + sodium iodide = sodium bromide + iodine
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Word equation for: Iodine and Sodium Chloride
No reaction
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Word equation for: Iodine and Sodium Bromide
No reaction
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why do group seven elements all have similar properties?
The group 7 elements have have similar properties because of the electronic structure of their atoms - they all have seven electrons in their outer shell.
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Why does reactivity of the halogens decrease as you get further down the group?
The atoms get larger, the outer shell gets further from the nucleus and the attraction between the nucleus and electrons gets weaker, so an electron is less easily gained
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What will an atom of a group 7 element form in a reaction?
In a reaction, an atom of a group 7 element will form an ion with a single negative charge (a halide ion).
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Show the half equation for: a chlorine molecule forming two chloride ions
Cl2 + 2e– = 2Cl–
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What predictions can scientist make about astatine?
Astatine should not displace any of the other halogens from their compounds and Astatine should be displaced from sodium astatide by fluorine, chlorine, bromine or iodine.
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What would you predict the displacement reaction word equation to be for bromine and sodium astatide?
bromine + sodium astatide = sodium bromide + astatine
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Other cards in this set

Card 2

Front

Name four group 7 elements.

Back

Fluorine, Chlorine, Bromine and Iodine

Card 3

Front

What are the three uses of chlorine?

Back

Preview of the front of card 3

Card 4

Front

What is the use of iodine?

Back

Preview of the front of card 4

Card 5

Front

Which group do the halogens react vigorously with?

Back

Preview of the front of card 5
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