IGCSE Coordinated Chemistry Workout 23

Four substances are added to an acid.

Which list contains all of the substances that will neutralise the acid?

• calcium oxide, sodium chloride and sodium hydroxide

• calcium oxide, magnesium carbonate and sodium hydroxide

• sodium chloride and sodium hydroxide

• magnesium carbonate and sodium chloride

The diagram shows a chemical reaction that produces a gas. The gas bleaches damp litmus paper.

What is the gas?

• ammonia

• chlorine

• hydrogen

• oxygen

Which statement about the elements in Group VII of the Periodic Table is correct?

• Chlorine displaces bromine from potassium bromide.

• The colour of the elements becomes darker up the group.

• The melting point of the elements decreases down the group.

• The reactivity of the elements increases down the group.

The table shows information about some minerals.

Which minerals contain a transition element?

• bauxite and galena

• bauxite and hematite

• galena and rutile

• hematite and rutile

Two tests are done on material Y. The tests show that Y conducts electricity and is soft.

What is Y?

• copper

• lithium

• sodium chloride

• sulfur

Which process does not produce carbon dioxide?

• complete combustion of fossil fuels

• reaction of an acid with a carbonate

• respiration in plants

• rusting iron

Lime is manufactured from limestone and is used for treating industrial waste.

Which row describes the type of reaction involved in the manufacture of lime and in the treatment of industrial waste?

• A

• B

• C

• D

A fuel used for cooking food is the hydrocarbon …1… that burns in an …2… reaction.

Which words correctly complete gaps 1 and 2?

• A

• B

• C

• D

W, X, Y and Z are diagrams of atoms and molecules.

Which statement is correct?

• W and Z are molecules and X and Y are atoms.

• W, X and Z are molecules and Y is an atom.

• W, Y and Z are molecules and X is an atom.

• X, Y and Z are molecules and W is an atom.

Hexane and octane are liquid hydrocarbons that mix together.

Which method is used to separate a mixture of these two liquids?

• A

• B

• C

• D