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iGCSE Chemistry > 4.2 Group 7 > Flashcards

4.2 Group 7 Flashcards

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1
Q

What are the properties of group 7 elements?

A

diatomic
darker in colour down group
mp / bp increases down group

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2
Q

What are the group 7 elements?

A

F2
Cl2
Br2
I2
At2

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3
Q

What is the formula for Fluorine?

A

Fl2

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4
Q

What is the formula for Chlorine?

A

Cl2

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5
Q

What is the formula for Bromine?

A

Br2

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6
Q

What is the formula for Iodine?

A

I2

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7
Q

What is the formula for Astatine?

A

At2

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8
Q

What is the colour of Fluorine?

A

pale yellow

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9
Q

What is the colour of Bromine?

A

brown

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10
Q

What is the colour of Chlorine?

A

pale green

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11
Q

What is the colour of Iodine?

A

dark grey

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12
Q

What is the colour of Astatine?

A

black

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13
Q

What state is Fluorine?

A

gas

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14
Q

What state is Chlorine?

A

gas

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15
Q

What state is Bromine?

A

liquid

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16
Q

What state is Iodine?

A

solid

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17
Q

What state is Astatine?

A

solid

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18
Q

What happens when group 7 elements react with metals?

A

ionic compound forms
outer shell electrons from metal transferred to halogen

19
Q

How many electrons do group 7 elements have in the outside shell?

A

7

20
Q

What happens when the group 7 atom forms an ion?

A

halogen -> halIDE

21
Q

Why is group 7 + metal a redox reaction?

A

metal loses electrons
group 7 gains electrons

22
Q

Why do halogens get less reactive down the group?

A

need full electron shell
atoms further down have more shells
further from nucleus
attraction to nucleus is weaker

23
Q

What is the chemical test for chlorine?

A

damp blue litmus paper turns white

24
Q

When does halogen displacement occur?

A

more reactive halogens displace less reactive halogens

25
Q

What colour is aqueous Chlorine?

A

colourless

26
Q

What colour is aqueous Bromine?

A

yellow

27
Q

What colour is aqueous Iodine?

A

brown

28
Q

What colour is potassium chloride?

A

colourless

29
Q

What colour is potassium bromide?

A

colourless

30
Q

What colour is potassium iodide?

A

colourless

31
Q

What is the reactivity trend in group 7?

A

clinton
brought
itchiness

32
Q

What is the order of group 7?

A

for
class
bro
i
ate

33
Q

What happens when colour change occurs in halogen displacements?

A

more reactive halogen must be present

34
Q

What happens when no colour change occurs in halogen displacement?

A

less reactive halogen must be present

35
Q

Colour change only occurs if….

A

more reactive halogen has displaced less reactive halogen

36
Q

A halogen can not displace…

A

itself or a more reactive halogen

37
Q

remember! the colour of the solution left behind is the colour of the…

A

displaced halogen NOT the more reactive halogen

38
Q

Why is the colour of the solution left behind the colour of the displaced halogen?

A

when displaced, the halogen becomes diatomic again rather and the more reactive halogen becomes a halIDE

39
Q

All halogen displacement reactions are…

A

redox reactions

40
Q

Why are all halogen displacement reactions redox reactions?

A

more reactive halogen steals an electron

41
Q

What does Bromine release?

A

releases brown fumes

42
Q

What does Iodine release?

A

releases purple fumes

43
Q

What does Bromine do?

A

volatiles

44
Q

What does Iodine do?

A

sublimes

iGCSE Chemistry (17 decks)

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