Year 10- Bonding and Structure
- Created by: Alice Cullen
- Created on: 29-12-16 13:27
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Bonding:
- When atoms share pairs of electrons, they form covalent bonds
- These bonds between atoms are strong
- Some covalently bonded substances (eg H2) consist of simple molecules
- Others (eg Diamond or Silicone Dioxide) have giant covalent structures, macromolecules
- These bonds between atoms are strong
- Compounds formed from non-metals consist of molecules
- In molecules, the atoms are held together by covalent bonds
Structure and how it influences the properties and uses of substances:
- Ionic compounds have regular structures (giant ionic lattices) in which there are strong electrostatic forces of attraction in all directions between oppositely charged ions
- These compounds have high melting and boiling points because of the large amount of energy needed to break the many strong bonds
- When melted or dissolved in water, ionic compounds conduct electricity because the ions are free to move and carry the current
- Sunstances that consist of simple molecules are gases, liquids or solids that have relatively low melting and boiling points
- Sunstances that are only simple molecules have only weak intermolecular forces
- It is these forces that are overcome, not the bonds when a substance melts or boils
- Sunstances that are only simple molecules have only weak intermolecular forces
- Substances that consist of simple molecules don't conduct electricity because the molecules don't have an overall electrical charge
- Atoms that share electrons can also form giant structures or macromolecules.
- Diamond and graphite (forms of carbon) and silicon…
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