Elements of the Sea: Group 7 Flashcards

1
Q

What are the solutions of chlorine bromine and iodine and why ( in terms of redox )

A

Oxidising agents because the elements gain electrons ( get reduced )

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2
Q

What are the solutions of chloride bromide and iodide and why ( in terms of redox )

A

Reducing agents because the ions lose electrons

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3
Q

Definition of halogen

A

Group 7 diatomic molecules

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4
Q

Examples of halogens

A

Chlorine, Cl2
Bromine, Br2
Fluorine, F2

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5
Q

Definition of halide ions

A

Group 7 ions

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6
Q

Examples of halide ions

A

Chloride, Cl-
Bromide, Br-
Fluoride, F-

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7
Q

Appearance of chlorine at room temp

A

Pale green gas

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8
Q

Appearance of bromine at room temp

A

Dark red liquid

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9
Q

Appearance of iodine at room temp

A

Shiny grey solid

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10
Q

Appearance of aqueous solution of chlorine at room temp ( chlorine in water )

A

Pale green

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11
Q

Appearance of aqueous solution of bromine at room temp ( bromine in water )

A

Orange/ yellow

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12
Q

Appearance of aqueous solution of iodine at room temp ( iodine in water )

A

Brown

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13
Q

Appearance of cyclohexane solution of chlorine at room temp

A

Pale green

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14
Q

Appearance of cyclohexane solution of bromine at room temp

A

Red/ brown/ orange

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15
Q

Appearance of cyclohexane solution of iodine at room temp

A

Violet

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16
Q

What happens to the solubility of silver halides when you add ammonia ( give examples )

A

Sobulitt decreases as you go down the group

Eg. AgCl = soluble
AgBr = partly soluble
AgI = insoluble

17
Q

What happens when you mix Chlorine (aq) and bromide ion (aq)

-give equation & explanation

A

Yellow solution forms

Cl2 + 2Br- —> 2Cl- + Br2

= chlorine displaces bromide ion because chlorine has stronger oxidising power

18
Q

What happens when you mix Chlorine (aq) and iodide ions (aq)

-give equation & explanation

A

Brown solution forms

Cl2 + 2I- —> 2Cl- + I2

= chlorine displaces iodide ion because chlorine has stronger oxidising power

19
Q

What happens when you mix Bromine (aq) and iodide ions (aq)

-give equation & explanation

A

Brown solution forms

Br2 + 2I- —> 2Br- + I2

= bromine displaces iodide ion because bromine has stronger oxidising power

20
Q

What happens when you mix a halogen that has a weaker oxidising power than the halide

Eg. Bromine & chloride ions

A

No reaction

21
Q

Give the order of halogens in strongest to weakest of oxidising power

A

Chlorine
Bromine
Iodine

22
Q

What is the trend of oxidising power of halogens ad you go down the group

A

Decreases as you go down the group

23
Q

Explain why oxidising power decreases as you go down the group

A
  1. Halogen atom gains an electron when it oxides the halide ion
  • atomic radius increases
  • increase shells
  • increase shielding
  • decrease ability to attract electrons ( gets weaker )
24
Q

Appearance of fluorine at room temp

A

Pale yellow gas

25
What happens to the melting and boiling point as you go down the group
Increase
26
Reason for trend in physical properties ( colour, mpt, bpt )as you go down the group
Strength of intermolecular forces increases as you go down the group
27
What happens to reactivity as you go down the group
Decreases
28
Why does group 7 reactivity decrease as you go down the group
- increase atomic radius - increased shielding - nuclear charge is further away from the outer shell to attract electrons
29
What happens to ionisation energy as you go down the group
Decreases
30
Why does ionisation energy decreases as you go down the group
- increase atomic radius - increased shielding - nuclear charge is further away from the outer shell - less energy required to remove electrons