Grade 9 Paper 6 Practice Questions Chemistry

Name the item of apparatus labelled A in Fig. 1.1.

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The catalyst is small pieces of aluminium oxide.

Explain why several small pieces of aluminium oxide speed up the reaction more than one

large piece of aluminium oxide.

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State the advantage of using a burette rather than a measuring cylinder to measure the

volume of water.

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State the advantage of using a burette rather than a volumetric pipette to measure the

volume of water.

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Explain the disadvantages of adding the 2.0 cm3 of water in 1.0 cm3 portions rather than 0.5 cm3

portions.

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What is the burette reading shown in the diagram?

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Answer explanation

volume delivered = final - initial

volume = 26.2 - 0.8 = 25.4

What is volume of liquid delivered based on the diagram should?

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Answer explanation

volume delivered = final - initial

volume delivered = 12.9 - 0.2 = 12.7

What volume of liquid is delivered based on the diagram shown?

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Answer explanation

volume delivered = final - initial

volume delivered = 39.1 - 1.0 = 38.1

At the start of Experiment 3 the burette is rinsed with distilled water and then with dilute hydrochloric acid B. Identify the substance removed from the burette when it is rinsed with distilled water at the

start of Experiment 3.

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Describe how the result of the titration would change if the burette was not rinsed with

dilute hydrochloric acid B after it had been rinsed with water.

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