C 2.1 Measurements

A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 25.0 cm³ of dilute hydrochloric acid.

Which pieces of apparatus does the student need?

• balance, stop-clock, pipette

• balance, stop-clock, thermometer

• balance, pipette, thermometer

• stop-clock, pipette, thermometer

Which piece of apparatus is used to measure exactly 26.3 cm³ of a liquid?

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The diagram shows liquid in a burette and in a measuring cylinder. Which answer shows the correct readings for the burette and the measuring cylinder?

• 27.8 and 42

• 27.8 and 44

• 28.2 and 42

• 28.2 and 44

A student mixes 25 cm³ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide. In each case, the student measures the change in temperature to test if the reaction is exothermic.

Which piece of apparatus is not needed?

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One of the instructions for an experiment reads as follows. Quickly add 50 cm³ of acid.

What is the best piece of apparatus to use?

• a burette

• a conical flask

• a measuring cylinder

• a pipette

Which piece of apparatus is used to measure variable quantities of liquid in a titration?

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P,Q,R and S are pieces of apparatus. What sentence describes the correct apparatus for the measurement made?

• P the volume of acid added to alkali in a titration

• Q. 1cm³ of acid to add to calcium carbonate in a rate-determining experiment

• R. 75 cm³ of a gas given off in a rate-determining experiment

• S. 20 cm³ of alkali for use in a titration

A student was asked to measure the rate of reaction between dilute hydrochloric acid and marble chips at different temperatures. some of the apparatus used is shown.

Which two other pieces of apparatus would be needed?

• balance and pipette

• balance and stopclock

• beaker and stopclock

• burette and pipette

A student uses the apparatus shown in the diagram below to measure the volume of carbon dioxide gas made when different masses of marble chips are added to 25 cm³ of dilute hydrochloric acid.

Which other items of apparatus are needed?

• funnel and balance

• funnel and stopwatch

• measuring cylinder and balance

• measuring cylinder and stopwatch

During a reaction, the following changes take place.

1. 1. The temperature rises.

2. 2. A gas is given off.

Which apparatus is required to measure the rate of this reaction?

• balance and burette

• balance and gas syringe

• gas syringe and burette

• gas syringe and stopclock