Macromolecules Flashcards
What is a macromolecule?
A very large molecule made up of a regular lattice of covalently bonded atoms.
What is an allotrope?
Different structural forms of the same element in the same physical state. Have a different arrangement of atoms.
What kinds of bonds exist in between atoms diamond, graphite and silica?
Covalent bonds between the atoms
How many bonds does one carbon atom in diamond make?
4
How many bonds does one carbon atom in graphite make?
3
What is the structure of diamond?
Giant covalent structure / giat molecular structure / macromolecular
Describe the structure of graphite
Atoms are in hexagonal layers arranged on top of each other. Each hexagon layer is a two dimensional giant molecule
What exists between the hexagonal layers of graphite?
Intermolecular forces of attraction
Why is diamond solid at room temperature?
Millions of strong covalent bonds.
Why does diamond have a high melting point?
Covalent bonds are very strong, A lot of energy is needed to break them
What makes diamond hard and strong?
Strong covalent bonds
Why doesn’t diamond conduct electricity?
Has no moving electrons as all the outer electrons of each carbon atom are involved in bonding.
Has no moving ions
Why isn’t diamond soluble in water?
Particles aren’t charged. Water molecules aren’t attracted to them
Why is graphite a solid at room temperature?
It has millions of strong covalent bonds.
Graphite has a high melting point because?
Strong covalent bonds need a lot of energy to break them.