Chemistry Revision Quiz 1

Which statement describes the bonding in sodium chloride?

• A shared pair of electrons between two atoms leading to a noble gas configuration.

• A strong force of attraction between oppositely charged ions.

• A strong force of attraction between two molecules.

• A weak force of attraction between oppositely charged ions.

The lead in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil moves across the paper more easily. Which statement explains this observation?

• Graphite has a high melting point.

• Graphite is a form of carbon.

• Graphite is a lubricant.

• Graphite is a non-metal.

Which statement about metals is not correct?

• They conduct electricity because delocalised electrons can move throughout the metal.

• They consists of layers of atoms that can slide over each other.

• They have a giant lattice of oppositely charged ions in a 'sea' of delocalised electrons.

• They have a giant lattice of positive ions in a 'sea' of delocalised electrons.

Which information is needed to calculate the relative atomic mass of an element?

• The total number of protons and neutrons in the most abundant isotope.

• The nucleon numbers and the total number of isotopes.

• The mass number and the abundance of each of its isotopes.

• The atomic number and abundance of each of its isotopes.

Magnesium, calcium, strontium and barium are Group II elements. Group II elements follow the same trend in reactivity as Group I elements.

Which statement about Group II elements are correct?

1. Calcium reacts faster than magnesium with water.

2. Barium reacts less vigorously than magnesium with dilute acid.

3. Strontium oxidises in air more slowly than barium.

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Chlorine, bromine and iodine are elements in Group VII of the Periodic Table.

Which statement about these elements are correct?

• The colour gets lighter down the group

• The density decreases down the group.

• They are all gases at room temperature and pressure.

• They are all non-metals.

Which metal compound produces a gas that turn limewater milky when it is heated with a Bunsen burner?

• copper(II) carbonate

• magnesium nitrate

• sodium sulfate

• zinc nitrate

What is the dot and cross diagram for a molecule of carbon dioxide?

• 
• 
• 
• 

Hydrogen chloride is a gas. It dissolves in water to form an acidic solution.

Which row shows the relative number of moles of hydrogen chloride in these samples?

• fewest --> most

  1 , 2, 3

• fewest --> most

  1, 3, 2

• fewest --> most

  2, 3, 1

• fewest --> most

  3, 2, 1