GCSE Chemistry - Types of Covalent Structures: Simple Molecular & Giant Covalent Structures

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*** WHAT'S COVERED ***
1. Simple Molecular Substances
* These substances have low melting and boiling points because only weak intermolecular forces need to be broken, not the strong covalent bonds within the molecules.
* The larger the molecule, the stronger the intermolecular forces, leading to higher melting and boiling points, as seen in the halogens.
* They do not conduct electricity as they have no free electrons or charged particles.
2. Giant Covalent Structures
* Composed of a vast number of non-metal atoms joined by strong covalent bonds in a regular, repeating lattice.
* They have very high melting and boiling points because a large amount of energy is needed to break the strong covalent bonds throughout the structure.
* Generally, they do not conduct electricity because they lack free-moving charged particles (graphite is a key exception).
3. Examples of Covalent Structures
* Simple molecular substances include chlorine and ammonia.
* Giant covalent structures include diamond, graphite, and silicon dioxide (silica).

*** CHAPTERS ***
0:00 Introduction
0:49 Properties of Simple Molecular Substances
1:09 Melting and Boiling Points of Simple Molecular Substances
2:31 Electrical Conductivity of Simple Molecular Substances
2:56 Properties of Giant Covalent Structures
3:16 Examples of Giant Covalent Structures
3:54 Structure of Silicon Dioxide

*** PLAYLISTS ***








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