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Chemistry > Chemical Tests > Flashcards

Chemical Tests Flashcards

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1
Q

Hydrogen

A

Low solubility in water
Lower density
Lighted splint into the gas

1) add 25cm3 of HCl followed by magnesium ribbons

Squeaky pop

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2
Q

Oxygen

A

Low solubility in water
Greater density
Glowing splint

1) add 2 spatulas of Manganese dioxide , 25cm3 of hydrogen peroxide solution

Re-lights

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3
Q

Carbon dioxide

A

Greater density
Bubble through limewater

1) add 25cm3 of HCl, then marble chips
2) suck up CO2 either a pipette and bubble it through limewater

Limewater goes cloudy

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4
Q

Chlorine

A

Greater density
Collected by downwards delivery
Soluble
Litmus paper any colour

1)redox reaction between HCl and potassium manganate

Turns blue litmus paper red, then bleaches white

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5
Q

Ammonia

A

Less dense
Collected by upwards delivery
Very soluble
Red litmus paper

1) two solids mixed together - gently heated

Turns blue

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6
Q

What is a flame test used for?

A

Used to identify the presence of a relatively small number of metal ions in a compound

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7
Q

How to do a flame test?

A

1) Clean nichrome wire by dipping it in HCl then holding it in a Bunsen - repeat 2/3 times
2) dip nichrome wire into small amount of substance testing
3) place the wire back in the flame again, colour is most visible if the solid is in contact with the hottest part of the flame
4) record colour of flame

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8
Q

Sodium colour

A

Orange/ yellow

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9
Q

Copper colour

A

Green

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10
Q

Potassium colour

A

Lilac

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11
Q

Lithium colour

A

Red

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12
Q

Calcium colour

A

Brick red

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13
Q

How to test for copper or iron

A

Take the solution and add sodium hydroxide

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14
Q

Iron precipitate (II)

A

Green

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15
Q

Iron precipitate (III)

A

Brown

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16
Q

Copper precipitate

A

Blue

17
Q

Testing for anions

A

Add the solution, then add nitric acid, if it fizzes it’s a carbonate

18
Q

If it’s not a carbonate?

A

Add silver nitrate to same test tube

19
Q

Chloride present

A

White precipitate

20
Q

Bromide present

A

Cream precipitate

21
Q

Iodide present

A

Yellow precipitate

22
Q

Sulphate test?

A

Add the solution to HCl and barium chloride to form a white precipitate - barium sulphate

23
Q

How to test for water?

A

Add anhydrous copper sulphate (white), if it turns blue water is present

24
Q

How to test for purity of water?

A

Boil it at exactly 100 degrees

Impure water would boil over a range of temps higher than 100

Chemistry (17 decks)

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