1. Which two elements form a giant covalent structure?
- Boron and aluminium
- Carbon and silicon.
- Fluorine and chlorine.
- Phosphorus and silicon.
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2. What is the solubility of covalent substances?
- They are soluble.
- They are not soluble, they have strong covalent bonds that are hard to break.
- The water molecules attract the negatively charges particles.
- The water molecules attract the positively charges particles.
3. Why do covalent bonds have high melting and boiling points?
- There is electrostatic attraction between all the atoms
- 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.
- There are many delocalised electrons.
4. What is the definition of covalent bonding?
- An atom provides a lone pair of electron to another atom.
- Shared pair of electrons between two atoms.
- Electrostatic attraction between oppositely charges atoms.
- Bonding between a metal and a none metal.
5. What is the conductivity of covalent substances?
- They conduct because of the partial charges acting upon the individual atoms in the substance.
- They do conduct, they consist of free moving electrons.
- They do not conduct,the electrons are fixed in bonds and there are no free moving charged particles(EXCEPT GRAPHITE).
- They conduct and sometimes don't when there are not enough charged particles in the substance.