Chemistry Chapter 3 -Part 2
- Created by: elliebaxter
- Created on: 24-01-17 19:48
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- Chemistry Chapter 3 - Part 2
- Giant ionic structures
- Need a lot of energy to break because of strong electrostatic forces between - and + ions
- Have high melting and boiling points
- Can conduct electricity when a liquid (molten) but not a solid
- Ions are free to move around in a liquid
- Many ionic compounds dissolve in water
- Can conduct electricity as a solution but not a solid
- As a solid, particles vibrate but are not free to move around
- Simple molecules (covalent)
- Low melting and boiling points
- Covalent bonds are very strong so atoms within each molecule are tight together
- However has weak intermolecular forces so do not need much energy to break
- Do not conduct electricity as there is no overall charge
- Giant covalent structures
- Also known as macromolecu-les
- Examples- diamond, graphite and silicon dioxide
- Held together by strong covalent bonds so have high melting and boiling points
- Insoluble in water
- Hard
- Do not conduct electricity (except graphite)
- Graphite
- No covalent bonds between layers so they slide over each other
- Has a free electron (delocalised)
- Can conduct electricity
- Hexagonally arranged
- Fullerenes
- Hexagonal arrangement
- Carbon cage-like structure
- Can deliver drugs to parts of the body
- Giant ionic structures
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