Question | Answer |
Do giant ionic structures have high or low melting points? | High-they have strong bonds |
Can giant ionic structures conduct electricity? | When dissolved or molten because the ions separate and are free to move |
Do simple molecular substances have high or low melting points? | Low because the inter-molecular forces are very weak |
Can simple molecular substances conduct electricity? | No because they have no free electrons and there are no ions |
Do giant covalent structures have high or low melting points? | High-strong covalent bonds |
Can giant covalent structures conduct electricity? | No-they are insoluble in water but do not even conduct when molten |
Do metallic structures have high or low melting points? | High-they have a giant structure |
Can metallic structures conduct electricity? | Yes-they have electrons that are free to move |
Why are metals malleable? | The metals have layers which can easily slide over each other |
Why can graphite and buckminster fullerene conduct electricity even though they are covalent structures? | Each carbon atom only forms three covalent bonds, this leaves each carbon atom with a free electron which can conduct electricity |
What is the structure of graphite? | Graphite structures are arranged in layers, with inter-molecular forces between the layers |
What is the structure of buckminster fullerene? | Spherical, football shape |
What is the structure of diamond? | It is a giant covalent structure made of carbon in which each carbon atom forms four covalent bonds |
What is the structure of silicon dioxide? | It is a giant covalent structure made of silicon and oxygen |