Assessing your Coordinated Sciences: Chemistry knowledge

Which row represents the particles of a gas colliding most frequently?

• A

• B

• C

• D

Which test is used to show that a sample of water is pure?

• Evaporate the water to see if any solids remain.

• Heat the water to check its boiling point.

• Test with anhydrous cobalt(II) chloride.

• Use universal indicator paper to check its pH.

A representation of an atom is shown. What is the nucleon number of this atom?

• 6

• 7

• 12

• 13

Ammonia, NH3, is a covalent molecule. Which diagram shows the outer shell electron arrangement in a molecule of ammonia?

• A

• B

• C

• D

Lithium reacts with fluorine to form the compound lithium fluoride. Which statement about this reaction is correct?

• Each fluorine atom gains one electron.

• Each fluorine atom gains two or more electrons.

• Each fluorine atom loses one electron.

• Each fluorine atom loses two or more electrons.

Which row describes the structure and a use of diamond?

• A

• B

• C

• D

Which change is a physical change?

• Copper(II) carbonate changes colour from green to black when it is heated, and stays black when it cools.

• Ethanol reacts with oxygen to form carbon dioxide and water.

• Hydrogen peroxide decomposes into water and oxygen when it is boiled.

• Ice forms liquid water when it is heated.

Which statement about the Periodic Table is correct?

• Most metallic elements are on the left.

• Elements in the same period have the same number of outer electrons.

• Elements on the left are usually gases.

• The relative atomic mass of the elements increases from right to left.

The diagram shows elements W, X, Y and Z in a section of the Periodic Table. Which statement about the reactivity of the elements is correct?

• X is more reactive than Y, and W is more reactive than Z.

• X is more reactive than Y, and Z is more reactive than W.

• Y is more reactive than X, and W is more reactive than Z.

• Y is more reactive than X, and Z is more reactive than W.

Some properties of substances are listed. 1 They conduct electricity. 2 They have low densities. 3 They have high melting points. 4 They are malleable. Which properties are shown by transition metals?

• 1 and 3 only

• 1 and 4 only

• 1, 2 and 3

• 1, 3 and 4