107 questions

Chemistry/Paper 3/Observations and Measurements

CAIEO-Level5070-o · Paper 3

Observations and Measurements

107 questions· page 1 of 11

Q22018 May/Jun·P3123MMediumQualitative Analysis

You are provided with solution $\mathbf{R}$ and solid $\mathbf{S}$ .

Carry out the following tests and record your observations in the table.
You should test and name any gas evolved.

test no.	test	observations
1	Test a sample of $\mathbf{R}$ with both red and blue litmus paper.
2	(a) To $1\text{ cm}$ depth of $\mathbf{R}$ in a test-tube, add an equal volume of aqueous barium nitrate. (b) To the mixture from (a), add dilute nitric acid.
3	To $2\text{ cm}$ depth of $\mathbf{R}$ in a test-tube, add a piece of magnesium ribbon.
4	Put $2\text{ cm}$ depth of $\mathbf{R}$ in a boiling tube and warm the liquid until it just begins to boil. To the hot $\mathbf{R}$ , add $\mathbf{S}$ , a small amount at a time, until no further reaction takes place. Filter the final mixture into a clean boiling tube. Retain the filtrate for tests 5 and 6.
5	To half of the filtrate from test 4 in a test-tube, add aqueous sodium hydroxide until no further change occurs.
6	To the other half of the filtrate from test 4 in a test-tube, add aqueous ammonia until no further change occurs.
7	Put a small amount of $\mathbf{S}$ into a hard glass test-tube and heat the solid. Retain the final solid for test 8.
8	(a) To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a test-tube, add a little of the final solid from test 7. (b) To the mixture from (a), add an equal volume of aqueous ammonia.

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(conclusions) ### Conclusions

Identify the compound present in $\mathbf{R}$ . ______

Identify compound $\mathbf{S}$ . ______

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Q22018 May/Jun·P3223MMediumQualitative Analysis

You are provided with solution R and solid S.

Carry out the following tests and record your observations in the table.
You should test and name any gas evolved.

test no.	test	observations
1	Test a sample of R with both red and blue litmus paper.
2	(a) To $1\text{ cm}$ depth of R in a test-tube, add an equal volume of aqueous barium nitrate. (b) To the mixture from (a), add dilute nitric acid.
3	To $2\text{ cm}$ depth of R in a test-tube, add a piece of magnesium ribbon.
4	Put $2\text{ cm}$ depth of R in a boiling tube and warm the liquid until it just begins to boil. To the hot R, add S, a small amount at a time, until no further reaction takes place. Filter the final mixture into a clean boiling tube. Retain the filtrate for tests 5 and 6.
5	To half of the filtrate from test 4 in a test-tube, add aqueous sodium hydroxide until no further change occurs.
6	To the other half of the filtrate from test 4 in a test-tube, add aqueous ammonia until no further change occurs.
7	Put a small amount of S into a hard glass test-tube and heat the solid. Retain the final solid for test 8.
8	(a) To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a test-tube, add a little of the final solid from test 7. (b) To the mixture from (a), add an equal volume of aqueous ammonia.

(a)
Identify the compound present in R. ______

Identify compound S. ______

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Q22018 Oct/Nov·P3122MMedium-HardQualitative Analysis

You are provided with solutions R and S.

Carry out the following tests and record your observations in the table. You should test and name any gas evolved.

test no.	test	observations
1	Test a sample of R with Universal Indicator paper.
2	To $1\text{ cm}$ depth of aqueous zinc sulfate in a test-tube, add R slowly with mixing until no further change occurs.
3	To $1\text{ cm}$ depth of aqueous chromium(III) chloride in a test-tube, add R slowly with mixing until no further change occurs.
4	Gently warm $2\text{ cm}$ depth of R in a hard-glass test-tube.
5	(a) To $1\text{ cm}$ depth of aqueous sodium chloride in a test-tube, add a few drops of aqueous silver nitrate. (b) To the mixture from (a), add R until no further change occurs.
6	(a) To $1\text{ cm}$ depth of aqueous potassium iodide in a test-tube, add an equal volume of dilute sulfuric acid and then one or two drops of S. (b) To the mixture from (a) add an equal volume of S and allow to stand for a few minutes.
7	To $2\text{ cm}$ depth of acidified aqueous potassium manganate(VII) in a test-tube, add an equal volume of S.
8	(a) To $1\text{ cm}$ depth of aqueous iron(II) sulfate in a test-tube, add an equal volume of S. (b) Add R to the mixture from (a) until no further change occurs.

(conclusions) Identify the compound present in R.

______

In test 7, S is acting as ______.

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Q22018 Oct/Nov·P3222MMedium-HardQualitative Analysis

You are provided with solutions R and S.

Carry out the following tests and record your observations in the table. You should test and name any gas evolved.

test no.	test	observations
1	Test a sample of R with red litmus paper and with blue litmus paper.
2	To $1\text{ cm}$ depth of aqueous calcium chloride in a test-tube, add R slowly with mixing until no further change occurs.
3	To $1\text{ cm}$ depth of aqueous chromium(III) chloride in a test-tube, add R slowly with mixing until no further change occurs.
4	To $2\text{ cm}$ depth of R in a hard-glass test-tube, add a piece of aluminium foil and warm the mixture gently until the reaction begins.
5	(a) To $1\text{ cm}$ depth of R in a boiling tube, add a small amount of sodium nitrate. Warm the mixture gently for about 10 seconds. (b) To the mixture from (a), add a piece of aluminium foil.
6	(a) To $1\text{ cm}$ depth of S in a test-tube, add a few drops of aqueous silver nitrate. (b) To the mixture from (a), add dilute nitric acid.
7	(a) To $1\text{ cm}$ depth of S in a test-tube, add an equal volume of dilute sulfuric acid and then one or two drops of aqueous hydrogen peroxide. (b) To the mixture from (a), add an equal volume of aqueous hydrogen peroxide and allow to stand for a few minutes.
8	(a) To $0.5\text{ cm}$ depth of acidified aqueous potassium manganate(VII) in a test-tube, add twice the volume of S. (b) To the mixture from (a), add a few drops of starch solution.
9	(a) To $1\text{ cm}$ depth of S in a test-tube, add an equal volume of dilute sulfuric acid. To the mixture, add three drops of aqueous potassium iodate solution. (b) To the mixture from (a), add $2\text{ cm}$ depth of R. (c) To the mixture from (b), add dilute sulfuric acid until no further change is seen.

(Conclusions) Identify the anion in each of the solutions.

The anion in R is ______ .
The anion in S is ______ .

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Q22017 Oct/Nov·P3123MMediumQualitative Analysis

You are provided with two solutions, R and S.

(a) Carry out the following tests and record your observations in the table.

You should test and name any gas evolved.

test no.	test	observations with solution R	observations with solution S
1	(a) To $2\text{ cm}$ depth of the solution in a test-tube, add aqueous sodium hydroxide until a change is seen. (b) To the mixture from (a), add excess aqueous sodium hydroxide.
2	(a) To $2\text{ cm}$ depth of the solution in a test-tube, add aqueous ammonia until a change is seen. (b) To the mixture from (a), add excess aqueous ammonia. Keep the final mixture for use in (c). (c) To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a boiling tube, add the final mixture from (b).
3	(a) To $1\text{ cm}$ depth of the solution in a test-tube, add an equal volume of dilute nitric acid. (b) Pour half of the mixture from (a) into a test-tube and add an equal volume of aqueous barium nitrate. (c) To the other half of the mixture from (a), add an equal volume of aqueous silver nitrate.

(b) ### Conclusions

Identify the compound in solution R.

The compound in solution R is ______ .

Identify the compound in solution S.

The compound in solution S is ______ .

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Q22016 May/Jun·P3222MMedium-HardObservations and Measurements

You are provided with solid R and solution S.

Carry out the following tests and record your observations in the table. You should test and name any gas evolved.

test no.	test	observations
1	To $1\text{ cm}$ depth of aqueous iodine in a test-tube, add a small amount of R and mix.
2	Dissolve a small amount of R in $3\text{ cm}$ depth of distilled water in a test-tube. Divide this solution into two equal portions for use in tests 3 and 4.	no observation required
3	(a) To $1\text{ cm}$ depth of aqueous barium nitrate in a test-tube, add a few drops of the solution of R from test 2. (b) To the mixture from (a), add dilute nitric acid.
4	(a) To $1\text{ cm}$ depth of silver nitrate in a test-tube, add the solution of R from test 2 until a change occurs. (b) To the mixture from (a), add the remainder of the solution of R.
5	(a) To $1\text{ cm}$ depth of aqueous iron(III) chloride in a test-tube, add a small amount of R and mix well. (b) To the mixture from (a), add about the same volume of dilute sulfuric acid and mix well for about 10 seconds. (c) Add aqueous sodium hydroxide to the mixture from (b) until no further change is seen.
6	To $1\text{ cm}$ depth of S in a test-tube, add about the same volume of dilute sulfuric acid. To the mixture in the test-tube, add a small amount of R and mix well.
7	To $1\text{ cm}$ depth of S in a test-tube, add about the same volume of aqueous hydrogen peroxide.
8	(a) To $1\text{ cm}$ depth of aqueous potassium iodide in a test-tube, add about the same volume of dilute sulfuric acid. To the mixture, add a few drops of S. (b) To the mixture from (a), add a few drops of starch solution. (c) To the mixture from (b), add a small amount of R and mix well.
9	To $1\text{ cm}$ depth of S in a test-tube, add about the same volume of aqueous sodium hydroxide. To the mixture add a small amount of R, mix well and leave to stand.

(conclusions) In tests 1 and 5, R is acting as ______ .

In test 8, S is acting as ______ .

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Q22015 May/Jun·P3122MMediumQualitative Analysis

You are provided with solutions $\mathbf{R}$ and $\mathbf{S}$ .
Carry out the following tests and record your observations in the table.
You should test and name any gas evolved.

test no.	test	observations
1	Gently warm $2\text{ cm}$ depth of $\mathbf{R}$ in a test-tube.
2	To $1\text{ cm}$ depth of aqueous zinc sulfate in a test-tube, add $\mathbf{R}$ until no further change occurs.
3	(a) To $1\text{ cm}$ depth of aqueous sodium chloride in a test-tube, add a few drops of aqueous silver nitrate. (b) To the mixture from (a), add $\mathbf{R}$ until no further change occurs.
4	(a) To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a test-tube, add an equal volume of $\mathbf{R}$ . (b) To the mixture from (a), add a small amount of copper(I) oxide powder. Leave to stand.
5	(a) To $1\text{ cm}$ depth of $\mathbf{S}$ in a test-tube, add an equal volume of aqueous barium nitrate. (b) To the mixture from (a), add dilute nitric acid.
6	To $1\text{ cm}$ depth of $\mathbf{S}$ in a test-tube, add $\mathbf{R}$ until no further change is seen. Allow the final mixture to stand for a few minutes.
7	(a) To $1\text{ cm}$ depth of $\mathbf{S}$ in a boiling tube, add an equal volume of dilute sulfuric acid. Add a small amount of manganese(IV) oxide to the boiling tube. Warm the mixture gently for about 20 seconds, then filter the warm mixture and collect the filtrate. (b) To $1\text{ cm}$ depth of the filtrate from (a) in a test-tube, add $\mathbf{R}$ until no further change occurs.

(conclusions) Identify the compounds in solutions $\mathbf{R}$ and $\mathbf{S}$ .

Solution $\mathbf{R}$ contains ______ .

Solution $\mathbf{S}$ contains ______ .

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Q22015 Oct/Nov·P3121MMediumQualitative Analysis

You are provided with solution R and solid S.

(a) Carry out the following tests and record your observations in the table.

You should test and name any gas evolved.

test no.	test	observations
1	To $2\text{ cm}$ depth of R in a test-tube, add a few drops of aqueous silver nitrate. Keep this mixture for use in tests 2 and 3.
2	Transfer about half of the mixture from test 1 to a test-tube and add dilute nitric acid.
3	To the rest of the mixture from test 1, add aqueous ammonia until no further change occurs.
4	(a) To $1\text{ cm}$ depth of R in a boiling tube, add a small amount of zinc carbonate. (b) To the mixture from (a) when the reaction has finished, add aqueous sodium hydroxide until no further change occurs.
5	(a) To $1\text{ cm}$ depth of aqueous barium nitrate in a test-tube, add a few drops of aqueous sodium carbonate. (b) To the mixture from (a), add R until no further change occurs.
6	To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a test-tube, add a small amount of S.
7	(a) To $1\text{ cm}$ depth of aqueous potassium iodide in a test-tube, add an equal volume of dilute sulfuric acid. To the mixture, add a small amount of S. Mix well then filter off some of the liquid into another test-tube. (b) To the filtrate from (a), add a few drops of starch solution.
8	To $1\text{ cm}$ depth of R in a boiling tube add a small amount of S. Warm the mixture and hold a piece of damp blue litmus paper at the end of the boiling tube.

(b) Conclusions

Identify the compound in solution R.

Solution R contains ______

In both tests 7 and 8, S is acting as ______

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Q22015 Oct/Nov·P3221MMediumExperimental Contexts

You are provided with solution R and solid S.

(a) Carry out the following tests and record your observations in the table.

You should test and name any gas evolved.

test no.	test	observations
1	(a) To $1\text{ cm}$ depth of R in a test-tube, add an equal volume of aqueous barium nitrate. (b) Add dilute nitric acid to the mixture from (a).
2	(a) To $2\text{ cm}$ depth of R in a test-tube, add a piece of magnesium ribbon. (b) To the mixture from (a) when the reaction has finished, add aqueous sodium hydroxide until no further change occurs.
3	To $2\text{ cm}$ depth of R in a boiling tube, add a small amount of S. Warm this mixture until all the solid disappears. Keep this solution for use in tests 4 and 5.
4	To $1\text{ cm}$ depth of the solution from test 3 in a test-tube, add aqueous ammonia until no further change occurs.
5	(a) To $1\text{ cm}$ depth of the solution from test 3 in a test-tube, add an equal volume of aqueous potassium iodide. (b) To the mixture from (a), add a small amount of solid sodium sulfite.
6	(a) To $1\text{ cm}$ depth of aqueous hydrogen peroxide in a test-tube, add a small amount of S. (b) Add aqueous ammonia to the mixture from (a).

(b) Conclusions

Identify the compound in solution R.

Solution R contains ______

Identify the cation in solid S.

The cation in solid S is ______

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Q22014 May/Jun·P3119MMediumQualitative Analysis

You are provided with solutions R and S.

Carry out the following tests and record your observations in the table. You should test and name any gas evolved.

test no.	test	observations
1	To $2\text{ cm}$ depth of R in a test-tube, add a piece of magnesium.
2	(a) To $1\text{ cm}$ depth of R in a test-tube, add a few drops of aqueous silver nitrate. (b) To the mixture from (a), add dilute nitric acid.
3	To $2\text{ cm}$ depth of R in a boiling tube, add an equal volume of S and warm the mixture gently. Place over the mouth of the boiling tube, a piece of filter paper which has been soaked in acidified aqueous potassium manganate(VII).
4	To $1\text{ cm}$ depth of aqueous iodine in a test-tube, add S.
5	To $2\text{ cm}$ depth of aqueous silver nitrate in a test-tube, add a few drops of S and leave to stand until no further change is seen.
6	(a) To $1\text{ cm}$ depth of aqueous iron(III) chloride in a test-tube, add an equal volume of S and mix well. (b) To the mixture from (a), add aqueous sodium hydroxide until no further change occurs.

(Conclusions) Give the formula for a cation and the formula for an anion in R.

A cation in R is ______ and an anion in R is ______ .

In Tests 4 and 6, S is acting as ______ .

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