Group 7 Flashcards

1
Q

What is observed when dilute ammonia (NH3) is added to AgBr

A

cream precipitate remains

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2
Q

Name products of reaction of Br2 (aq) + 2NaCl (aq)

A

Br2 + 2NaCl
no reaction
as bromine cannot displace chlorine as chlorine is higher up in group 7

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3
Q

define an oxidising agent

A

electron acceptor

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4
Q

Give half equation for oxidation for bromide ions

A

2Br^- -> Br2 + 2e^-

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5
Q

State observation for this reaction
Cl2 (aq) + 2NaI(aq) -> I2 (aq) + 2NaCl (aq)

A

Brown solution I2 is formed

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6
Q

why is chlorine added to drinking water

A

to kill bacteria

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7
Q

what is observed in this reaction
Ag^+ (aq) + I^- (aq) -> AgI (aq)

A

yellow precipitate

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8
Q

What is the observation when sulfur is formed in a redox reaction in a reaction using sulfuric acid

A

Yellow solid

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9
Q

What is the test for halide ions

A

Acidified silver nitrate (AgNO3)

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10
Q

What is observed when dilute ammonia (NH3) is added to AgCl

A

White precipitate dissolves

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11
Q

Name products of reaction of I2 (aq) + 2NaCl (aq)

A

No reaction as brown solution remains

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12
Q

State observation for reaction Cl2 (aq) + 2NaBr (aq) -> Br2 (aq) + 2NaCl (aq)

A

Orange / brown solution is formed (Br2 is formed)

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13
Q

What is the observation when SO2 is formed in a reaction using sulfuric acid

A

acidic gas

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14
Q

chlorine is toxic. Why is it not dangerous to add it to drinking water

A

It is added in low concentations

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15
Q

Give products of reaction of Cl2 (g) + 2NaOH (aq)

A

NaCl (aq) + NaClO (aq) + H2O (l)

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16
Q

Give products of equation of NaCl (s) + H2SO4 (aq)

A

NaHSO4 (s) + HCl (g)

17
Q

What is observed when bromide ions reactant with sulfuric acid in a redox reaction

A

Acidic gas (SO2)
Brown fumes (Br2)

18
Q

What is the observation when adding iodine is formed in a reaction with sulfuric acid

A

Black solid

19
Q

What is observed when concentrated ammonia is added to AgBr

A

cream precipitate dissolves

20
Q

define reducing agent

A

electron donor

21
Q

What is observed in this reaction in Ag^+ (aq) + Cl^- (aq) -> AgCl (aq)

A

white precipitate

22
Q

What is observed in equation Ag^+(aq) + F^- (aq) -> AgF (aq)

A

colourless solution

23
Q

Why must a halide solution be acidified before testing with silver nitrate

A

to remove carbonate ions

24
Q

What is observed in reaction of NaCl (s) + H2SO4 (aq) -> NaHSO4 (aq) + HCl (g)

A

Steamy fumes