Categories: All - conductivity - ionic - solubility - covalent

by Chia Da Wei 12 years ago

192

Bonding

Ionic bonds form when metals and non-metals exchange electrons, creating giant lattice structures with high melting and boiling points. These ionic compounds, such as sodium chloride, are generally soluble in water and can conduct electricity in liquid form due to the mobility of ions.

Bonding

Bonding

Ionic Bond

Cannot conduct electricity in solid form ; Can conduct electricity in liquid form

Cannot conduct : The ions are not free to move about Can conduct : The ions are free to move about

Soluble in water
High melting and boiling points
Structure of Ionic Compounds
Arranged in giant lattice structure or crystal lattice
Form giant ionic structures
Compounds that contain ionic bonds are called ionic compounds
Examples?

Sodium Chloride

Magnesium Fluoride

Attracted to both elements by electrostatic attraction
Formed between Metals and Non-Metals
May also known as electrovalent bond

Covalent Bond

Physical properties
Cannot conduct electricity

Do not have free-moving ions or electrons to conduct electricity

Insoluble in water
Low melting and boiling points

Very little heat energy is required to overcome the intermolecular forces.

Molecules of Compounds
Molecules made up of two or more different types of atoms linked together by covalent bonding are called molecular compounds or covalent compounds.
Molecules of Elements
A double bond is formed when two pairs of electrons are shared between two atoms.
Sharing of two electrons forms a single covalent bond
Introduction
A molecule is a group of two or more atoms held together by covalent bonds.
Molecules are formed when atoms combine
Formed between atoms that share electrons is called a covalent bond