1. Why do covalent bonds have high melting and boiling points?
- There is electrostatic attraction between all the atoms
- There are many delocalised electrons.
- There are strong covalent bonds between all atoms, that require a lot of heat energy to break.
- There are strong ionic bonds between all atoms.
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2. What is the description for simple covalent substances?
- A simple covalent substance consists of oppositely charged particles, but with a small charge difference between the atoms.
- A simple covalent structure consists of a small number of atoms and a small number of covalent bonds as well. This forms a molecule with weak intermolecular forces.
- A simple covalent substance consists of a large number of atoms, but with weak bonds between them.
- A simple covalent structure consists of strong intermolecular forces between atoms.
3. What is the solubility of covalent substances?
- The water molecules attract the negatively charges particles.
- They are soluble.
- They are not soluble, they have strong covalent bonds that are hard to break.
- The water molecules attract the positively charges particles.
4. What is the conductivity of covalent substances?
- They do not conduct,the electrons are fixed in bonds and there are no free moving charged particles(EXCEPT GRAPHITE).
- They do conduct, they consist of free moving electrons.
- They conduct and sometimes don't when there are not enough charged particles in the substance.
- They conduct because of the partial charges acting upon the individual atoms in the substance.
5. Which two elements form a giant covalent structure?
- Phosphorus and silicon.
- Carbon and silicon.
- Boron and aluminium
- Fluorine and chlorine.