National 5ChemistrySQAExam QuestionsChemistry In SocietyChemical Analysis

Chemical Analysis (SQA National 5 Chemistry): Exam Questions

Exam code: X813 75

16 mins16 questions
1
1 mark

Which of the following compounds can be prepared by precipitation?

You may wish to use the data booklet to help you.

  • Lithium sulfate

  • Sodium sulfate

  • Barium sulfate

  • Magnesium sulfate

Choose your answer

2
1 mark

A student was reading the volume of liquid in a piece of apparatus.

Graduated cylinder containing liquid at the 9 millilitre mark, with clear measurement lines and numbers.

The correct volume, in cm3 , that the student should record is

  • 8.8

  • 9.1

  • 9.2

  • 10.8

Choose your answer

3
1 mark

A titration was performed using hydrochloric acid and a 10 cm3 solution of sodium hydroxide.

The results are shown in the table.

Titration

Initial reading (cm3 )

Final reading (cm3 )

Titre (cm3 )

1

0.0

11.0

11.0

2

11.0

21.1

10.1

3

22.0

32.6

10.6

4

33.0

43.3

10.3

The average of the concordant titre values, in cm3 , is

  • 10.8

  • 10.5

  • 10.3

  • 10.2

Choose your answer

4
1 mark

A titration was performed using hydrochloric acid and a 10 cm3 solution of sodium hydroxide.

The results are shown in the table.

Titration

Initial reading (cm3 )

Final reading (cm3 )

Titre (cm3 )

1

0.0

11.0

11.0

2

11.0

21.1

10.1

3

22.0

32.6

10.6

4

33.0

43.3

10.3

Which piece of apparatus is the most appropriate to measure and transfer the 10 cm3 of sodium hydroxide solution?

  • Burette

  • Pipette

  • Conical flask

  • Measuring cylinder

Choose your answer

5
1 mark

The apparatus shown was used to measure the energy released when four different fuels were burned.

Diagram of a scientific experiment with a thermometer in a glass beaker of water, heated by a fuel lamp below, all on a stand.

Which of the following changes would not improve the experimental results?

  • Increasing the distance between the burner and the beaker

  • Placing a lid on the beaker

  • Using a copper beaker

  • Using a heat shield/draft shield

Choose your answer

6
1 mark

The table shows the colours of ions in solution.

Ion

Colour in solution

Sodium

colourless

Calcium

colourless

Copper(II)

blue

Chloride

colourless

Chromate

yellow

Dichromate

orange

Which line in the table is correct for the colour in solution and the flame colour when copper(II) chloride is burned?

You may wish to use the data booklet to help you.

Colour in solution

Flame colour

A

colourless

blue

B

blue-green

blue

C

colourless

blue-green

D

blue

blue-green

    Choose your answer

    7
    1 mark

    Which salt cannot be prepared by a precipitation reaction?

    You may wish to use the data booklet to help you.

    • Barium sulfate

    • Lead(II) sulfate

    • Calcium chloride

    • Silver chloride

    Choose your answer

    8
    1 mark

    The Benedict’s test and the iodine test are commonly used to identify the presence of glucose and starch.

    The results of these tests are shown.

    Test

    Result for glucose

    Result for starch

    Benedict’s test

    blue to orange

    no change

    Iodine test

    no change

    brown to blue/black

    Flame tests can be used to identify the presence of some metal ions.

    An unknown mixture was tested and the following results obtained.

    Test

    Result for unknown mixture

    Benedict’s test

    blue to orange

    Iodine test

    no change

    Flame test

    yellow flame

    Which of the following mixtures could give the results shown?

    You may wish to use the data booklet to help you.

    • Glucose and sodium chloride

    • Starch and sodium chloride

    • Glucose and strontium chloride

    • Starch and strontium chloride

    Choose your answer

    9
    1 mark

    The apparatus shown can be used to identify the products of combustion.

    Diagram of an experimental setup where gas X is cooled in an ice bath, passes through limewater, and is connected to a water pump.

    When gas X was burned, a colourless liquid collected in the cooled test tube but there was no change in the limewater.

    Gas X could be:

    • methane

    • carbon monoxide

    • hydrogen

    • ethane.

    Choose your answer

    10
    1 mark

    A student measured 25 cm3 of sodium hydroxide for a titration experiment using a 100 cm3 measuring cylinder. Their teacher suggested that there was a more accurate piece of apparatus to measure this volume.

    Which piece of apparatus should the student have used to more accurately measure out the 25 cm3 volume of sodium hydroxide?

    • 100 cm3 beaker

    • 25 cm3 measuring cylinder

    • 25 cm3 pipette

    • 100 cm3 conical flask

    Choose your answer

    11
    1 mark

    Nitrogen dioxide is a brown coloured gas that is soluble in water and more dense than air.

    Which of the following diagrams shows the most appropriate method for collecting and measuring the volume of nitrogen dioxide?

    • Diagram showing a measuring cylinder partially filled with water. Labels point to water level and the measuring cylinder for clarification.
    • Diagram of a measuring cylinder inverted in a tub of water, with bubbles rising inside, labelled as measuring cylinder, tub, and water.
    • Diagram of a measuring cylinder with a spout, featuring graduated markings along its side. The label "measuring cylinder" is positioned beside it.
    • Diagram of a measuring cylinder with vertical measurement markings and a spout. Labelled text points to the cylinder, identifying it as a measuring cylinder.

    Choose your answer

    12
    1 mark

    A solution of a metal chloride burns with a green flame.

    Which of the following metal ions could be present in the metal chloride?

    You may wish to use the data booklet to help you.

    • Ba2+

    • Ca2+

    • K+

    • Na+

    Choose your answer

    13
    1 mark

    Identify the gas that turns limewater cloudy.

    • Oxygen

    • Nitrogen

    • Hydrogen

    • Carbon dioxide

    Choose your answer

    14
    1 mark

    AgNO3 (aq) + NaBr(aq) rightwards arrow NaNO3 (aq) + AgBr(s)

    The reaction shown by the equation is an example of

    • addition

    • combustion

    • precipitation

    • neutralisation.

    Choose your answer

    15
    1 mark

    2K+ (aq) + 2I– (aq) + Pb2+ (aq) + 2NO3 - (aq) rightwards arrow PbI2 (s) + 2K+ (aq) + 2NO3 - (aq)

    The type of reaction represented by this equation is

    • neutralisation

    • precipitation

    • addition

    • redox.

    Choose your answer

    16
    1 mark

    A student prepared a sample of copper sulfate crystals by reacting excess copper carbonate with acid.

    Three laboratory setups: X shows a bunsen burner heating a bowl, Y depicts a beaker with powder being added, and Z illustrates a filtration setup.

    Which line in the table shows the correct order in which this experiment would be carried out?

    • Y, X, Z

    • X, Y, Z

    • Z, Y, X

    • Y, Z, X

    Choose your answer