3rd form MC Exam Practice

An atom with an atomic number of 15 and an atom with an atomic number of 9 would:

• 1. Form a covalent compound

• 1. Form an ionic compound

• 1. Form a metallic lattice

• 1. Not bond with each other

Ionic bonding occurs between:

• 1. Two metals

• A metal and a non-metal

• A metalloid and a non-metal

• Two non-metals

Covalent bonding occurs between:

• 1. Two metals

• A metal and a non-metal

• A metalloid and a non-metal

• Two non-metals

1. The number of bonds that an atom can form when it bonds with another atom is called 

• Atomic number

• 1. Covalency number

• 1. Valence number

• 1. Mass number

1. How many electrons are shared in a double bond?

• 2

• 3

• 4

• 6

How many electrons are shared in a triple bond?

• 2

• 4

• 6

• 8

1. A molecular formula: 

• 1. Is a diagrammatic representation of one molecule of the compound using lines to represent bonds

• 1. Is the simplest whole number ratio between elements in a compound

• 1. Is the actual number of atoms of each element

• 1. Is the formula of an element

1. An empirical formula: 

• 1. Is a diagrammatic representation of one molecule of the compound using lines to represent bonds

• 1. Is the simplest whole number ratio between elements in a compound

• 1. Is the actual number of atoms of each element

• 1. Is the formula of an element

What changes when an ion is made from an atom?

• the number of electrons only

• the number of neutrons only

• the number of protons only

• the number both of protons and of neutrons

1. Ionic compounds can only conduct electricity when in aqueous solution because:

• 1. Water molecules conduct electricity

• 1. Electrons become free when they are in aqueous solution 

• The ions become free when they are in aqueous solution

• Protons becomes free when they are in aqueous solution