Covalent Substances Flashcards
1
Q
Give the features of a simple molecular substance
A
- Very stong covalent bonds
- Weak intermolecular forces No charge as there are no ions
2
Q
What state is a simple molecular substance at room temperature?
A
A gas or liquid
3
Q
Do simple molecular substances have a low melting point or high melting point?
A
Low because of the weak intermolecular forces
4
Q
Do simple molecular substances conduct electricity?
A
No because they dont have any free electrons
5
Q
Give the features of a giant macromolecular substance (Diamond)
A
- Very high melting point
- Strong covalent bonds
- Doesnt conduct electricity
- Each carbon atom has 4 bonds so it is very rigid.
6
Q
Give the features of a giant macromolecular substance (Silicon dioxide)
A
- Strong covalent bonds
- Very high melting point
- Doesnt conduct electricity
- Each grain is a single structure.
7
Q
Give the features of a giant maromolecular substance (Graphite)
A
- Very high melting point
- Strong covalent bonds
- Does conduct electricity
- Carbon atoms form only 3 bonds so it has free electrons.
- Layers due to the weak intermolecular forces
- Good conductor of heat.
