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Chemistry > 4.2 3 and 4 > Flashcards

4.2 3 and 4 Flashcards

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1
Q

halide ions

A

act as reducing agents

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2
Q

sulfuric acid ionisation

A

h+
HSO4 2-
SO42-

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3
Q

sulfuric acid

A

can act as an oxidising agent -when acts as an oxidising agent it is reduced

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4
Q

sulfuric acid and halides possible products

A

sulfur dioxide ,sulfur and hydrogen sulfide

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5
Q

NaCl+H2SO4

A

misty fumes get HCl

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6
Q

NaBr+H2SO4

A

misty fumes
brown fumes
colourless gas with choking smell
HBr Br2 SO2

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7
Q

NaI+H2SO4

A 
misty fumes
purple fumes or black solid
colourless gas with a choking smell
yellow solid
colourless gas with a rotten egg smell
HI I2 S02 S H2S (hydrogen sulfide)
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8
Q

misty fumes

A

hydrogen chloride

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9
Q

brown fumes

A

bromine

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10
Q

black solid

A

iodine

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11
Q

sodium chloride

A

sulfuric acid behaves only as an acid as has such a low reducing power

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12
Q

sodium bromide

A

cause sulfuric acid to be reduced

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13
Q

sodium iodide

A

causes sulfuric acid to be reduced

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14
Q

how to test for halides in solution

A

silver nitrate solution dilute nitric acid is added before to ensure any of other anions espically carbonate ions are removed as they would form precipitate if a preciptate obstained add ammonia solution dilute or concentrated

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15
Q

chloride ions test result

A

white precipitate

soluble in dilute and concentrated aqueous ammonia

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16
Q

bromide ions result

A

cream precipitate
insoluble in dilue
soluble in conc aqueous ammonia

17
Q

iodide ions

A

yellow precipitate
insoluble
insoluble

18
Q

why can silber nitrate solution not test for fluroide ions

A

silver fluroide is insoluble

19
Q

hydrogen halides

A

gases and exist as polar diatomic molecules

20
Q

hydrogen halides reaction with water

A 
hydrofluoric acid 
hydrochloric acid
hydrobromic acid
hydroiodic acid 
e.g HF+H2O =H3O+ +F-
21
Q

hyrdogen halides react with ammonia gas

A

to form salts-all white ionic

Chemistry (37 decks)

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