NAFS Mock Exam

How many electrons do most elements want to have in their outer shell to be stable?

Define crystalline solid.

• A solid in which the atoms CANNOT be changed.

• A regular repeating, three-dimensional structure of atoms that form a crystal lattice.

• A pure solid that can conduct electricity.

• A pure solid that has a defined melting and boiling point.

Identify the non-metal which exists in a liquid state in room temperature 25∘C.

• Aluminium

• Mercury

• Iodine

• Bromin

High viscosity can be described as...

• a liquid that flows quickly

• a liquid that flows slowly

Who arranged the first periodic table.

• Mosely

• Einstein

• Mendeleev

• Bohr

What is Viscosity?

• A fluids colour.

• A fluids temperature.

• A fluids resistance to flow.

What does it mean to dilute a solution?

• lower the concentration of solute per solvent

• increase the concentration of solute per solvent

• A mixture that contains two or more substances uniformly combined

What is the electronic configuration of Lithium?

• 2.8.8

• 2.2.2

• 2.8.5

• 2.1

an ink marker is an example of

• Pure Substance

• Solution

• Heterogeneous mixture

• Compound

5 many covalent bonds does carbon need to form in order to have a full octet?

• 2

• 3

• 4

• 5