Home » 國際課程 » IGCSE課程 » Details

Edexcel IGCSE Chemistry 復習筆記 1.6 5 Ionic compounds: Bonds, Structure & Properties

Category: IGCSE課程, 國際課程, 教材筆記, 福利干貨 Date: 2022年7月13日上午11:31

The positive and negative charges are held together by the strong?electrostatic forces of?attraction?between?oppositely?charged ions
This is what holds ionic compounds together

Oppositely-charged-ions-attraction-due-to-electrostatic-attraction.png

Electrostatic forces hold the ions together in sodium chloride

Ionic compounds are made of charged particles called ions which form a giant lattice structure
Ionic substances have?high?melting and boiling points due to the presence of?strong?electrostatic forces?acting between the oppositely charged ions
These forces act in all directions and a lot of energy is required to overcome them

Strong electrostatic forces act in all directions in an ionic solid such as sodium chloride

Ionic compounds are usually?solid?at room temperature and are?non-volatile
They are usually?water soluble?as both ionic compounds and water are?polar??substances

2.1-The-Periodic-Table-Hydration-of-Sodium-Chloride

Ionic compounds are soluble in water because the ions are easily hydrated by polar water molecules

Ions with higher charge have stronger electrostatic forces and will thus have higher melting and boiling points.

For electrical current to flow there must be present freely moving charged particles such as electrons or ions
Ionic compounds can conduct electricity in the?molten?state or in?solution?as they have ions that can move and carry charge
They cannot conduct electricity in the solid state as the ions are in fixed positions within the lattice and are unable to move