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Chemistry > Chemical tests > Flashcards

Chemical tests Flashcards

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1
Q

Give the test and result for hydrogen gas.

A

The test and result for hydrogen gas is a lit / burning splint makes a ‘squeaky pop’ sound.

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2
Q

Give the test and result for oxygen gas.

A

The test and result for oxygen gas is a glowing splint relights.

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2
Q

Give the test and result for carbon dioxide gas.

A

The test and result for carbon dioxide gas is limewater turns cloudy / milky.

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3
Q

Give the test and result for chlorine gas.

A

The test and result for chlorine gas is that damp litmus paper turns red and then bleaches white.

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4
Q

Give the test and result for ammonia gas.

A

The test and result for ammonia gas is using damp red litmus paper which will turn blue.

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5
Q

True or False?

Chlorine is a colourless, pungent gas.

A

False.

Chlorine is a green pungent gas

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6
Q

What is a flame test used for?

A

A flame test is used to identify metal ions by the colour of the flame they produce when heated.

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7
Q

True or False?

The Bunsen burner flame should be on a blue flame for flame tests.

A

True.

The Bunsen burner flame should be on a blue flame for flame tests as this is the hottest flame.

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8
Q

Give the flame colour produced by sodium ions.

A

The flame colour produced by sodium ions is yellow.

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9
Q

Give the flame colour produced by copper(II) ions.

A

The flame colour produced by copper ions is blue / green.

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10
Q

True or False?

The flame colour produced by potassium ions is pink.

A

False.

The flame colour produced by potassium ions is lilac.

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11
Q

Give the flame colour produced by calcium ions.

A

The flame colour produced by calcium ions is orange-red.

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12
Q

True or False?

The flame colour produced by lithium ions is red.

A

True.

The flame colour produced by lithium ions is red.

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13
Q

Why is the nichrome wire first dipped in hydrochloric acid?

A

The nichrome wire is first dipped in hydrochloric acid to avoid contamination.

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14
Q

Define the term cation.

A

A cation is a positively charged ion.

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15
Q

What is the formula of an ammonium ion?

A

The formula of an ammonium ion is NH4+.

16
Q

What colour precipitate is formed when sodium hydroxide is added to a solution containing copper(II) ions?

A

The colour of the precipitate formed when sodium hydroxide is added to a solution containing copper(II) ions is blue.

17
Q

True or False?

Iron(III) ions form a green precipitate in the presence of sodium hydroxide.

A

False.

Iron(III) ions form a brown precipitate in the presence of sodium hydroxide.

18
Q

Describe a test for ammonium ions.

A

The test for ammonium ions is:

Add sodium hydroxide solution

If ammonium ions are present, ammonia gas is produced which turns damp red litmus paper blue.

19
Q

What colour precipitate is formed when sodium hydroxide is added to a solution containing iron(II) ions??

A

The colour of the precipitate formed by iron(II) ions in the presence of sodium hydroxide is green.

20
Q

Define the term anion.

A

An anion is a negatively charged ion.

21
Q

Describe the test and result for bromide ions.

A

The test and result for bromide ions is:

Add dilute nitric acid followed by silver nitrate solution

A cream precipitate is formed

22
Q

What is the formula of a carbonate ion?

A

The formula of a carbonate ion is CO32-

23
Q

Describe the test and result for carbonate ions.

A

The test for carbonate ions is:

Add dilute hydrochloic acid and test the gas produced by bubbling it through limewater.

If carbonate ions are present, carbon dioxide is produced which turns limewater cloudy.

24
Q

Describe the test and result for iodide ions.

A

The test and result for iodide ions is:

Add dilute nitric acid followed by silver nitrate solution

A yellow precipitate is formed

25
Q

True or False?

Chloride ions give a white precipitate with acidified silver nitrate solution.

A

True.

Chloride ions give a white precipitate with silver nitrate solution.

26
Q

True or False?

To test for sulfate ions, acidified berylium chloride is used.

A

False.

To test for sulfate ions, barium chloride is used

27
Q

Name the white precipitate formed during a positive test for sulfate ions.

A

The white precipitate formed during a positive test for sulfate ions is barium sulfate.

28
Q

When acidified silver nitrate solution is added to a sample containing bromide ions, a precipitate of silver bromide is formed.

What is the state symbol for this precipitate?

A

The state symbol for the precipitate of silver bromide is s.

29
Q

Describe the chemical test for water.

A

Describe the chemical test for water.

30
Q

Define the term pure substance.

A

A pure substance consists of a single element or compound.

31
Q

Describe the physical test used to determine whether a sample of water is pure.

A

The physical test to determine whether a sample of water is pure is to check its boiling point which should be exactly 100 oC.

32
Q

What colour does anhydrous copper(II) sulfate turn in the presence of water?

A

Anhydrous copper(II) sulfate turns blue in the presence of water.

33
Q

True or False?

Impurities tend to raise the boiling point of water.

A

True.

Impurities tend to raise the boiling point of water.

34
Q

Name the piece of apparatus used to check the boiling point of water.

A

The piece of apparatus used to check the boiling point of water is a thermometer.

35
Q

True or False?

Impurities tend to raise the melting point of water.

A

False.

Impurities tend to lower the melting point of water.

Chemistry (17 decks)

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