Covalent bonding Flashcards
What is a covalent bond?
A shared pair of electrons between two non-metals. 2 positive nuclei are held together by their common attraction of a shared pair of electrons.
What are diatomic molecules?
These molecules are elements that in their purest form are found in pairs when they are alone.
What are the 7 diatomic elements?
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
What are the properties of covalent molecules(discreet)?
Low melting point, Low boiling points, poor conductors of electricity, weak forces of attractions between molecules, strong covalent bonds between atoms.
What is a covalent network?
A covalent network is a very large single molecule made of billions of atoms joined together by covalent bonds.
What are examples of covalent Networks?
Diamond, Graphite
What are the properties of diamond?
Very high melting point, very high boiling point cannot conduct electricity does not dissolve
What are the properties of graphite?
High melting point, high boiling pint, soft substance, can conduct electricity as it has delocalised electrons between the layers.
Why do covalent networks substance have very high melting and boiling points?
Because the network of strong covalent bonds is not easily broken.
What type of bonding and structure does not conduct electricity and have high melting points?
Covalent network.
What type of bonding does not conduct electricity and have low melting points?
Discrete covalent molecular.
If graphine can conduct electricity what does that suggest about the electrons in graphene?
It has delocalised electrons between the layers.
Methane is a covalent molecular substance why is methane a gas at room temperature?
Because it has weak bonds bonds between molecules or weak intermolecular forces.
explain why covalent network substances have very high melting and boiling points
to boil the substance a very high number of strong covalent bonds must be broken
Explain why covalent network substances do not conduct electricity
no electrons are free to move
