5076 Prelims Revision

An unknown gas can be collected using the apparatus shown.

Based on the diagram only, what can your infer about the physical property of this gas?

• It is denser that air.

• It is insoluble in water.

• It is less dense than air.

• It is soluble in water.

In the distillation apparatus shown, what are the parts labelled A and B?

• A = funnel, B = thermometer
• A = thermometer, B = funnel
• A = condenser, B = flask
• A = condenser, B = thermometer

In an experiment, a student needs to measure out 36.50 cm³ of a solution. Which piece of apparatus would measure this volume most accurately?

• beaker

• burette

• measuring cylinder

• pipette

What method is used to obtain copper(II) sulfate crystals from its solution?

• Crystallisation

• Evaporation to dryness

• Paper chromatography

• Fractional distillation

When an acid, X, was added to a solution containing the nitrate of metal Y, a dense white substance was precipitated.

• acid X: nitric acid; metal Y: zinc

• acid X: sulfuric acid; metal Y: barium

• acid X: hydrochloric acid; metal Y: calcium

• acid X: hydrochloric acid; metal Y: silver

When dilute acid was added to an unknown sample, effervescence was observed. Which anion is present?

• ammonium ion

• carbonate ion

• nitrate ion

• sulfate ion

Which of the following is correct?

• P is nitric acid.

• S is copper(II) hydroxide.

• T is carbon dioxide.

• U is copper(II) hydroxide.

• U is barium chloride.

When excess sodium hydroxide was added to an unknown sample, this was observed. What is the precipitate formed?

• copper(II) hydroxide

• zinc hydroxide

• iron(III) hydroxide

• iron(II) hydroxide

Two gas jars each contain a different gas. The gas jars are connected and the cover slips are removed. The diagram shows what happens to the particles of the gases. Which process has occurred?

• chemical reaction

• condensation

• diffusion

• evaporation

The diagrams show the arrangement of particles in three different physical states of substance X. Which statement about the physical states of substance X is correct?

• Particles in state 1 vibrate about fixed positions.

• State 1 changes to state 2 by diffusion.

• State 2 changes directly to state 3 by condensation.

• The substance in stage 3 has a fixed volume.