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chemistry > group 7 > Flashcards

group 7 Flashcards

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1
Q

What are the observations when NaF/ NaCl react with concentrated sulfuric acid

A

white steamy fumes

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2
Q

What is the role of H2SO4 when NaF/NaCl react with H2SO4

A

Acid (proton donor)

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3
Q

What are the observations when NaBr reacts with H2SO4

A

White steamy fumes when HBr evolve
Orange fumes of bromine
Colourless acidic gas

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4
Q

What are the observations when NaI reacts with H2SO4

A 
White steamy fumes when HI evolve
Black solid + purple fumes when Iodine evolves
colourless acidic gas SO2
Yellow solid of sulfur
H2S gas with bad egg smell
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5
Q

What forms when silver nitrate reacts with Br-

A

AgBr

Ag2CO3

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6
Q

What forms when excess nitric acid is added to AgBr and Ag2CO3, write the reactions

A

Br-
CO2

AgBr + 2NH3 –> [Ag(NH3)2]+ + Br-

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7
Q

AgCl precipitate

A

white

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8
Q

AgBr precipitate

A

cream

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9
Q

AgI precipitate

A

pale yellow

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10
Q

Silver chloride + dilute ammonia

A

Dissolves
AgCl + 2NH3 –> [Ag(NH3)s]+ + Cl-
Colourless solution

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11
Q

Silver bromide + concentrated ammonia

A

Dissolves
AgBr + 2NH3 –> [Ag(NH3)2]+ + Br-
Colourless solution

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12
Q

Silver iodide + ammonia

A

No reaction - too insoluble

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13
Q

What does nitric acid do in group 7 reactions

A

React with carbonates to get rid of/ prevent formation of Ag2CO3

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14
Q

Calcium hydroxide ppt colour

A

white

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15
Q

Strontium hydroxide

A

does not form hydroxide precipitate due to high solubility

solution highly alkaline

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16
Q

barium hydroxide

A

does not form hydroxide precipitate due to high solubility

highly alkaline

17
Q

Magnesium + sulfate

A

does not form sulfate precipitate due to high solubility

18
Q

Calcium + sulfate

A

does not form sulfate precipitate due to high solubility

19
Q

strontium + sulfate

A

white precipitate

20
Q

barium + sulfate

A

white precipitate

21
Q

Test for ammonium

A

Add NaOH and heat gently with litmus present

If NH4+ present, litmus will go red

22
Q

Give an equation between iodide ions and sulfuric acid to produce acidic colourless gas

A

2H+ + 2I- + H2SO4 –> I2 + SO2 + 2H2O

23
Q

Give an equation between iodide ions and sulfuric acid to produce yellow solid

A

6H+ + 6I- + H2SO4 –> 3I2 + S + 4H2O

24
Q

Give an equation between iodide ions and sulfuric acid to produce foul smelling gas

A

8H+ + 8I- + H2SO4 –> 4I2 + H2S + 4H2O

25
Q

Give an equation between bromide ions and sulfuric acid to produce acidic colourless gas

A

2H+ + 2Br- + H2SO4 –> Br2 + SO2 + 2H2O

26
Q

why is a excess of silver nitrate added

A

To make sure all halide ions are removed from solution

27
Q

A solution of sodium chlorate(l) was added to a colourless solution of potassium iodide.
Suggest what is observed.

A

Chlorine oxidises iodine, so solution turns brown

chemistry (8 decks)

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