End-Of-Chapter Test

End-of-chapter test

Chapter 3 Higher

1A suspect tore his top and cut his arm when he ran from a break-in. The fibres and the blood may be a clue to his identity. Suggest a method for separating the clothing fibres from the blood.

(4 marks)

2A corrosive substance was thrown during a protest about animal rights. The fire brigade tested it and obtained the following results.

Colour with red litmus paper / blue
Colour with blue litmus paper / stayed blue
Colour with universal indicator paper / blue

aSuggest what type of substance was thrown.

(1 mark)

bSuggest the pH of the substance.

(1 mark)

cGive the name of a substance that could be used to neutralise this substance.

(1 mark)

3A sample of ink was taken from a ransom note and another sample was taken from a suspect’s pen. Both samples were separated using chromatography. The resulting chromatograms are shown below.

Compare the two chromatograms and give two facts that you can conclude about the two ink samples.

(2 marks)

4If a mixture contains blood or human cells, why may it not be appropriate to evaporate it using heat from a Bunsen burner?

(2 marks)

5The police want to know if a suspect in a car accident has been drinking alcohol.

Identify the technique used to separate blood from alcohol.

(1 mark)

6Some metals are more reactive than others. The reactivity series lists metals in order of their reactivity.

Most reactive

potassium
sodium
lithium
calcium
magnesium
zinc
iron
copper

silver

gold

platinum

Least reactive

aName one metal that is more reactive than iron.

(1 mark)

bName one metal that is less reactive than copper.

(1 mark)

CState whether copper would be able to displace iron from iron oxide.

(1 mark)

7A lorry carrying sulfuric acid overturned and spilled acid onto the motorway. The firebrigade was advised to neutralise it with sodium hydroxide.

a Write a word equation for the reaction the fire brigade carried out.

(1 mark)

b Suggest why fire brigades may choose to neutralise spilt acid and why it would be important to identify the products of any neutralisation reaction before carrying it out.

(2 marks)

8Marcus wants to test the reactivity series of metals. He decides to test the order of reactivity of potassium, iron, and gold with water. Design an experiment Marcus could use to test the reactivity series of potassium, iron, and gold. Describe what you would expect Marcus’ findings to be. (6 marks)

In this question you get marks for how well your answer is written.

You will get marks for:

spelling
grammar
organising your ideas and information clearly
using key scientific words.

9Draw and explain particle diagrams to show how filtering and evaporation are used to separate mixtures. Refer to the physical properties being utilised in both techniques.

(6 marks)

10The apparatus needed for paper chromatography is shown below.

Explain how paper chromatography separates the components in a dot of ink.

(4 marks)

11Explain two properties of both wool and sisal that make them suitable for use in carpets.

(2 marks)

12Write a balanced formula equation for the neutralisation of sulfuric acid (H2SO4) by sodium hydroxide. Include state symbols in your equation.

(The charge on a sodium ion is +1 and the charge on a sulfate ion is -2.)

(3 marks)

13A suspect has been arrested for driving a car whilst drunk. A police doctor took a blood sample and sent it to a forensic laboratory. It was analysed using gas chromatography.

The following gas chromatogram was obtained of the suspect’s blood.

aDescribe what is shown in this chromatogram.You should compare the relative amounts of each substance present.

(4 marks)

bExplain why gas chromatography would be used to analyse blood samples containing alcohol instead of paper chromatography. You should identify the mobile and stationary phase for both types of chromatography.

(5 marks)

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