Substances made up of simple covalent molecules have high or low melting points?
Low melting points, the bonds between molecules (not covalent) are weak
What are the forces between simple covalent molecules called?
Intermolecular forces
Atoms held together by covalent bonds only form small "simple" structures [True/False]
False - they can form giant structures also like diamond.
What is the name give to the large, cage like structure carbon can form using covalent bonds?
Fullerene or Bucky-ball
What is the diameter of a Buckyball?: 1m, 1mm, 1cm, 1um, 1nm.
1nm (nanometer)
What is the name of the intermolecular forces between water molecules?
Hydrogen bonds
Can simple molecules held together with covalent bonds conduct electricity?
No, they do not have charged particles that a free to move.
Which carbon structure can be used as a delivery system for drugs into specific sites in the body?
Fullerenes or Bucky-balls
What does it mean if an atom "gets the electronic structure of a Noble gas"?
They gain or lose electrons to get a full outer shell (just like the Noble gas elements)
What type of bond is formed when non-metal atoms share electrons?
Covalent bond
What is a huge network of atoms held together by covalent bonds called?
A giant covalent structure
What is the difference between graphite and graphene
Graphene has only 1 layer of carbon atoms. Graphite has many layers
Do giant covalent structures have high or low melting points?
High - the covalent bonds are strong.
Graphite can conduct electricity because it has free electrons in between the layers [True/False]
True
How could a Fullerene/Buckyball improve the delivery of drug molecules to a particular site in the body?
Protect the drug molecules from the bodies digestive system and kidneys. The coating of the Buckyball can make the body take it to the required site.
Most of the molecules in the substances that make up living things are held together by the covalent bonds between non-metal atoms [True/False]
True
The carbon atoms in a diamond are held together by ionic bonds [True/false]
False - non metals bond together with covalent bonds.
Does Carbon dioxide form a simple or giant covalent structure?
Simple - you can tell because it is a gas at room temp.
Two Oxygen atoms will bond together by sharing 2 pairs of electrons. What type of covalent bond is this?
A double covalent bond
How many covalent bonds have formed between these two nitrogen atoms?
3
The smallest Fullerene/Buckyball is made of 60 atoms of which element?
Carbon
What is the name given to a sheet of graphene which has been rolled into a tube.
Carbon nanotube
Why can the layers of graphite easily slide off (e.g. when you use a pencil)?
The bonds between carbon layers are not covalent, they are weak intermolecular forces
Does Silicon dioxide (picture) form a simple or giant covalent structure?
Giant - you can tell as it can form crystals