C2 Covalent Bonding Flashcards
How r covalent bonds formed?
By atoms sharing electrons
Which type of atoms form covalent bonds between them?
Non-metals 🤘
Describe the structure and bonding of a giant covalent substance?
Billions of atoms bonded together by strong covalent bonds
Describe the structure and bonding of small molecules
Small numbers of atoms group together into molecules with strong covalent bonds between the atoms and weak intermolecular forces between the molecules
Describe the structure and bonding of polymers
Many identical molecules are joined together by strong covalent bonds in a long chain, with weak intermolecular forces between the chains ⛓️
Y do giant covalent substances have high meeting points?
It takes a lot of energy 🔋 to break the strong covalent bonds between the atoms
Y do small molecules have low meeting points?
Only a small amount of energy 🔋 is needed to break the weak intermolecular forces
Y do large molecules have higher melting and boiling points than small
Molecules?
The intermolecular forces are stronger in large molecules
Y do most covalent substances not conduct electricity 💡?
Do not have delocalised electrons or ions
Describe the structure and bonding in graphite
Each carbon atom is bonded to three others in hexagonal rings 💍 arranged in layers-it has delocalised electrons and weak forces between the layers
Y can graphite conduct electricity 💡?
The delocalised electrons can move through the graphite
Explain y graphite is soft
Layers r not bonded so can slide over each other
What is graphene?
One layer of graphite
Give two properties of graphene
Strong
Conducts electricity 💡
Fullerene?
A hollow cage of carbon atoms arranged as a sphere or a tube 🚇
