Experimental Technique

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

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

The diagram shows three pieces of apparatus that are used for measuring the volume of a liquid. What are these pieces of apparatus?

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The four pieces of apparatus shown below are used in chemical experiments. Which statement about the apparatus is correct?

• The burette measures the volume of liquid added in a titration.

• The measuring cylinder measures the mass of a substance used in an experiment.

• The pipette measures the volume of gas given off in a reaction.

• The thermometer measures the density of a solution.

A student measures the rate of two reactions.

In one reaction, there is a change in mass of the reactants during the reaction.

In the second reaction, there is a change in temperature during the reaction.

Which piece of apparatus would be essential in both experiments?

• balance

• clock

• pipette

• thermometer

Crystals of sodium chloride were prepared by the following method.

1. 1 25.0 cm³ of dilute hydrochloric acid was accurately measured into a conical flask.

2 Aqueous sodium hydroxide was added until the solution was neutral. The volume of

sodium hydroxide added was measured.

3 The solution was evaporated and the crystals washed with approximately 15 cm³ of water.

Which row shows the pieces of apparatus used to measure the 25.0 cm³

of hydrochloric acid, the volume of aqueous sodium hydroxide and the 15 cm³ of water?

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Lead iodide is insoluble in water.

Lead iodide is made by adding aqueous lead nitrate to aqueous potassium iodide.

Which pieces of apparatus are needed to obtain solid lead iodide from 20 cm³ of aqueous lead

nitrate?

• 1, 2

• 1, 3 and 5

• 1, 4 and 5

• 2, 4 and 5

The diagram shows an experiment to find the formula of magnesium oxide.

Which piece of apparatus would be needed in addition to those shown?

• a balance

• a measuring cylinder

• a spatula

• a thermometer

A student investigates how the concentration of an acid affects the speed of reaction with a 0.5 g mass of magnesium at 30 °C.

Which pieces of apparatus does the student use?

• P, Q and R only

• P, Q and S only

• Q, R and S only

• P, Q, R and S

A student carries out an experiment to find how fast 3 cm pieces of magnesium ribbon dissolve in

10 cm³ samples of sulfuric acid at different temperatures.

Which piece of apparatus does the student not need?

• balance

• measuring cylinder

• stop-clock

• thermometer