Year 9 Chemistry Test

Which one of the following can be found in the nucleus of an atom?

• Protons

• Electrons

• Hydrogen

• Isotope

The mass number of an atom is the total number of:

• protons and electrons in the atom.

• protons and neutrons in the atom.

• protons in the atom.

• electrons in the atom.

The charge of an atom - in the Periodic Table of Elements - is always:

• positive.

• greater than the charge of its nucleus.

• neutral.

• negative.

Which of the following statements about atoms is true?

• The number of neutrons in the nucleus of any atom is always the same.

• Protons orbit the outside of the nucleus all the time.

• Neutrons and protons are located in the nucleus, as are the the electrons.

• An atom is mostly empty space.

What is the electron configuration of a chlorine atom? Chlorine has an atomic number of 17.

• 2, 10, 5

• 2, 8, 7

• 2, 2, 2, 2, 2, 2, 2, 2, 1

• 8, 8, 1

How many valence (or outer most shell) electrons does a carbon atom have?

• 4

• 2

• 6

• 1

A negatively charged ion is called:

• a cation.

• a nucleotide.

• an iron.

• an anion.

Which one of the following is the correct chemical formula for the hydrocarbon propane (shown below)?

• C₃H₈

• C₄H₂

• C₂H₅OH

• ethanol

Neutralisation reactions - between acids and bases - can be generalised by which one of the following word equations?

• acid + base → salt + hydrogen + water

• acid + base → water

• acid + base → salt + water

• acid + base → salt + carbon dioxide + water

On the pH scale, the most correct definition is that:

• neutral substances are 7, basic substances are less than 7 and acidic substances are greater than 7.

• neutral substances are 7, acidic substances are 0 and basic substances are 14.

• neutral substances are 0, acidic substances are between 0 and 7, and basic substances are greater than 7.

• neutral substances are 7, acidic substances are less than 7 and basic substances are greater than 7.