G9 IGCSE Coordinated Chemistry Workout #1

In which experiment does limewater become milky?

• A

• B

• C

• D

Which statement about the Periodic Table is correct?

• Elements are listed in order of neutron number.

• Elements are listed in order of nucleon number.

• Elements are listed in order of proton number.

• Elements are listed in order of relative atomic mass.

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 a flammable gas.

Some properties of aluminium are listed.

1 It conducts heat.

2 It has a low density.

3 It has strong alloys.

4 It is resistant to corrosion.

Which properties make aluminium useful in aircraft manufacture?

• 1, 2 and 3

• 1, 2 and 4

• 1, 3 and 4

• 2, 3 and 4

Which conditions are required for rusting?

• air only

• air and water

• salt and water

• water only

The colours in four dyes are separated using chromatography.Which chromatogram shows an insoluble colour?

• A

• B

• C

• D

Which statement about an atom of fluorine, F¹⁹, is correct?

• It contains more protons than neutrons.

• It contains a total of 28 protons, neutrons and electrons.

• Its isotopes contain different numbers of protons.

• Its nucleus contains 9 neutrons.

Calcium reacts with chlorine to produce calcium chloride.

What happens when a calcium ion forms during this reaction?

• The calcium atom gains one electron.

• The calcium atom gains two electrons.

• The calcium atom loses one electron.

• The calcium atom loses two electrons.

Which row describes the formation of single covalent bonds in methane (CH4) ?

• atoms share a pair of electrons; both atoms gain a noble gas electronic structure.

• atoms share a pair of electrons; both atoms have the same number of electrons in their outer shell

• electrons are transferred from one atom to another; both atoms gain a noble gas electronic structure.

• electrons are transferred from one atom to another; both atoms have the same number of electrons in their outer shell.

Diamond and graphite have giant covalent structures of carbon atoms.

Which statement describes graphite?

• It has a strong, rigid three-dimensional structure.

• It has four strong covalent bonds between each carbon atom

• It has layers, which can slide over each other.

• It has no free electrons, so does not conduct electricity.