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Chem Exam 4 > Group 17 > Flashcards

Group 17 Flashcards

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1
Q

Electron configuration

A

ns2 np5

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2
Q

Physical state at 298K

A

Fluorine - Pale yellow gas
Chlorine - Pale yellowish green gas
Bromine - Reddish Brown liquid
Iodine - Purplish-black solid

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3
Q

Colour intensity down the group due to

A

increases due to increase in metallic properties of elements

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4
Q

Physical properties

A

Simple diatomic molecule
reactive non-metal
not found in the elemental state in nature

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5
Q

nuclear charge
volatility
mp/bp
Solubility in water

A

constant
decrease
increase
sparingly soluble

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6
Q

Atomic and ionic radii down the group why

A

increase due to extra electron shells

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7
Q

Effective nuclear charge down the group

A

constant

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8
Q

volatility down the group and why

A

decrease due to increase in number of electrons and can de Waals forces

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9
Q

Solubility and exceptions and why

A

Sparingly soluble because they cant form hydrogen bond
Except for Iodine due to formation of water-soluble ion I3-
Fluoride because it can form hydrogen bonds
and chloric acid when exposed to strong sunlight

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10
Q

What is bond energy

A

Energy required to break a particular covalent bond per mole of the bond

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11
Q

bond energy down the group and exception

A

decrease due to increase in atomic radius making covalent bond longer and weaker

except Fluorine to Chlorine due to closeness of atoms which result in repulsion between non-bonding electron

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12
Q

Oxidising strength of group 17 in general and down the group

A

All powerful oxidising agents and oxidising strength decrease down the group

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13
Q

What is oxidising strength indicated by

A

positive standard electrode potentials

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14
Q

Halides react with hydrogen to form

A

Hydrogen halide

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15
Q

What is reaction between hydrogen and halide

A

redox reaction

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16
Q

Reaction of group 17 elements with hydrogen

A

Fluorine - Explosive in light and dark
Chlorine - Explosive in bright sunlight
Bromine - Needs heat and catalyst
Iodine - needs heat catalyst (nickel or platinum) and is reversible

17
Q

Boiling point of hydrogen halides down the group and exception and explanation

A

Increase down the group due to total number of electrons increase causing intermolecular van der Waals forces to get stronger

HF is higher than HCl due to strong intermolecular hydrogen bonds

18
Q

What happens to hydrogen halides on heating

A

Decompose to their elements (Split hydrogen from halogen)

19
Q

What happens during decomposition

A

Covalent bond between hydrogen and halogen breaks

20
Q

Thermal stability of Hydrogen halides down the group and reason

A

Decrease as covalent bonds get longer and weaker

21
Q

Only hydrogen halide that is considered stable and reason

A

Hydrogen Fluoride due to strong hydrogen bonds

22
Q

When platinum wire is introduce in jar of hydrogen iodide gas what happens

A

Purple fume released which is iodine vapour formed by decomposition of hydrogen odide

23
Q

What is produced when chlorine reacts with sodium hydroxide

A

Sodium chloride and sodium chlorate (I) is produced (+water)

24
Q

What reaction is the reaction between chlorine reacts with sodium hydroxide and what is it

A

disproportionation reaction where chlorine is reduced to chloride but oxidised to sodium chlorate(I) at the same time.

25
Q

What is produced when concentrated chlorine reacts with sodium hydroxide at 70C

A

Sodium chloride and sodium chlorate (V) is formed

26
Q

What is formed when silver nitrate reacts with halide ions

A

Coloured precipitate - Silver halide or AgX

27
Q

What happens to AgCl and AgBr when dissolves in ammonia solution

A

form colorless solution

28
Q

AgCl
Colour
Solubility in diluted ammonia
Solubility in concentrated ammonia

A

White
Soluble
Soluble

29
Q

AgBr
Colour
Solubility in diluted ammonia
Solubility in concentrated ammonia

A

Cream
Insoluble
souluble

30
Q

AgI
Colour
Solubility in diluted ammonia
Solubility in concentrated ammonia

A

Yellow
Insoluble
Insoluble

31
Q

Solid halide heated with concentrated sulphuric acid forms what

A

Hydrogen halide

32
Q

What happens when KBr KI experienced prolonged heating with concentrated sulphuric acid

A

Hydrogen halide further oxidises into halide + Sulphur Dioxide +Water

33
Q

Solid halides and their reaction with concentrated H2SO4 (colour)

A

NaCl - White fumes
KBr - White fumes and reddish brown fumes after prolonged heating
KI - White fumes +violet fumes after prolonged heating

34
Q

What is used to convert KBr and and KI into hydrogen halide

A

concentrated phosphoric acid H3P4

Chem Exam 4 (1 decks)

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