covalent bonds Flashcards
1
Q
What type of atoms form covalent bonds?
A
non-metals
2
Q
What happens when a covalent bond forms?
A
electrons pair up so that all of the atoms have a full shell.
3
Q
What are simple covalent structures?
A
Covalent molecules that only contain a few atoms.
4
Q
Name some properties of simple covalent structures.
A
- low melting and boiling points
- liquids or gases at room temperature
- easily broken bonds
5
Q
Describe the bonds within a simple covalent structure.
A
Covalent bonds within the structure are strong but the bonds between molecules are weak.
6
Q
What are molecular solids?
A
Simple covalent structures (covalent molecules with few atoms) that are solid at room temperature.
7
Q
Give an example of a molecular solid and why it is formed.
A
- Iodine
- formed because millions of iodine molecules are held together by weak forces of attraction to create a 3D molecular lattice.
8
Q
Give some properties of molecular solids.
A
- soft and brittle
- low melting and boiling points
- cannot conduct electricity because there are no free electrons to carry the charge
9
Q
What are double bonds? Give an example.
A
- A double bond is when two pairs of electrons are shared.
- EG: Carbon dioxide
