IGCSE Coordinated Chemistry Workout 14

The colours in an ink can be separated by chromatography.

Which diagram shows the correct way to set up the apparatus?

• A

• B

• C

• D

The diagram shows a helium atom. Which particles in the helium atom have approximately the same mass?

• electron and proton only

• electron and neutron only

• proton and neutron only

• electron, proton and neutron

How many atoms of metals and of non-metals are shown in the formula Na₂SO₄?

• A

• B

• C

• D

The apparatus shown is used to investigate the speed of reaction between hydrochloric acid and calcium carbonate. The time to collect 50 cm³ of gas is measured. Using concentrated acid and lumps of calcium carbonate, the time is 150 s.

In a second experiment, the time is 90 s. Which change was made in the second experiment?

• lower temperature

• less concentrated acid

• larger lumps of calcium carbonate

• higher temperature

Hydrogen and oxygen react explosively to form water. Which terms describe this reaction?

• A

• B

• C

• D

The diagram shows litmus paper testing the gas that is given off from the contents of the test tube.

The damp litmus paper

• turns blue.

• turns colourless.

• turns red.

• turns red and is then bleached white.

Universal Indicator solution is added to test-tubes W, X and Y. What are the colours of the Universal Indicator?

• green in W; red in X; purple in Y.

• purple in W; green in X; red in Y.

• red in W; green in X; purple in Y.

• red in W; purple in X; green in Y.

The table shows physical properties of some substances. Which substance is a metal?

• A

• B

• C

• D

Which statement about lithium, sodium and potassium is not correct?

• They are in the same group of the Periodic Table.

• They are in the same period of the Periodic Table.

• They float on water.

• They react with water to give the flammable gas hydrogen.

Copper is obtained from copper oxide by heating with non-metal X. Which shows the identity of non-metal X and the type of reaction non-metal X undergoes?

• X is carbon undergoing oxidation

• X is carbon undergoing reduction

• X is oxygen undergoing oxidation

• X is oxygen undergoing reduction