ST.3 Covalent Bonding N5 (CCS) Flashcards
What is a covalent bond?
A covalent bond is a shared pair of electrons between atoms of 2 non-metal elements
Are covalent bonds strong or weak?
Strong
When does a covalent bond happen?
When the positive nuclei from 2 different non-metal atoms are held together by their common attraction for the shared pair of electrons between them
What do atoms that share pairs of electrons form?
Molecules
What is a molecule?
A group of atoms held together by covalent bonds
What is a diatomic molecules?
A molecule only containing 2 atoms
What state are covalent molecular substances at room temperature?
Usually liquid or gas
What are the 7 diatomic elements?
Hydrogen, Iodine, Nitrogen, Chlorine, Bromine, OXygen and Fluorine
Why can covalent molecular substances not conduct electricity?
They have no free electrons to move around and carry an electric current
Why are covalent molecular substances usually gas or liquid at room temperature?
The electrostatic attractions between molecules are weak and easy to overcome
What state are covalent network substances at room temperature?
Always solid, usually insoluble in water
What is the only covalent network substance that conducts electricity?
Graphite
What are all the properties of covalent networks?
Very high melting point, doesnt conduct in any state, insoluble, strong covalent bonds are broken
What are all the properties of covalent moleculars?
Low melting point, doesnt conduct in any state, more likely to be insoluble, weak forces of attraction are broken
