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Chemistry > Testing Stuff > Flashcards

Testing Stuff Flashcards

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1
Q

How do you conduct a flame test?

A

Dip a wire loop (or soaked wooden splint) into the substance and hold it into a bunsen flame

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2
Q

What colour flame does lithium produce?

A

Red

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3
Q

What colour flame does sodium produce?

A

Yellow

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4
Q

What colour flame does potassium produce?

A

Lilac

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5
Q

What colour flame does calcium produce?

A

Brick red

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6
Q

What colour flame does barium produce?

A

Apple green

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7
Q

What happens in sodium hydroxide tests?

A

When we react sodium hydroxide with a salt, an insoluble metal hydroxide forms as a precipitate.
By identifying the metal hydroxide, this lets us see what metal was in the salt.

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8
Q

What colour is the precipitate when copper (II) is reacted with sodium hydroxide?

A

Light blue

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9
Q

What colour is the precipitate when iron (II) is reacted with sodium hydroxide?

A

Light green

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10
Q

What colour is the precipitate when iron (III) is reacted with sodium hydroxide?

A

Reddish brown

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11
Q

How do you test for carbonates?

A

Add dilute HCL - produces gas

Bubble gas through limewater - should turn milky (shows it is CO2)

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12
Q

How do you test for ammonia?

A

Ammonia is an ALKALINE gas so it turns damp red litmus paper blue

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13
Q

How do you test for ammonium salts?

A

Add sodium hydroxide solution - ammonium salts give off ammonia

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14
Q

How do you test for sulphates?

A

Add barium chloride solution - White precipitate formed

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15
Q

What are halides?

A 
Ions of group 7 elements
e.g.
Chloride
Bromide
Iodide
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16
Q

How do you test for halides?

A

Add silver nitrate solution

17
Q

What is produced when chloride ions react with silver nitrate?

A

White precipitate

18
Q

What is produced when bromide ions react with silver nitrate?

A

Cream precipitate

19
Q

What is produced when iodide ions react with silver nitrate?

A

Yellow precipitate

20
Q

How do you test for oxygen?

A

Relights a glowing splint

21
Q

How do you test for hydrogen?

A

Produces a squeaky pop sound when held by lit splint

22
Q

How do you test for carbon dioxide?

A

Bubble through limewater - turns milky

23
Q

How do you test for chlorine gas?

A

Will bleach damp blue litmus paper

24
Q

How do you test for alkenes?

A

Shake with bromine water - alkenes only show colour change from brown/orange to colourless

25
Q

How do you test for alcohols?

A

Heat with acidified potassium dichromate solution - alcohols give colour change from ORANGE to GREEN

26
Q

How does sodium react with water?

A

It fizzes rapidly, moves around and melts to form a ball on the surface of the water

27
Q

How does lithium react with water?

A

Fizzes steadily and floats, becoming smaller until it eventually disappears

28
Q

Which metals react with water and what do they produce?

A

Potassium
Sodium
Lithium
Form metal hydroxides and hydrogen gas

29
Q

How does potassium react with water?

A

Sparks
Lilac flame
Very quick reaction

Chemistry (6 decks)

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