1. Directions: Write True if the statement is correct and write False it is not correct. Write your
answer in a separate sheet of paper.
1. It is a form of carbon which makes up the lead in pencils.
2. Pure carbon can exist in different forms, depending on how its atoms are
arranged
3. Coal and soot or carbon black are informally called diamond.
4. Diamond is a form of carbon in which each carbon atom is bonded to four other
carbon atoms.
5. Pure carbon is the name used for carbon that does not have
any crystalline structure.
6. Graphite is the hardest known natural mineral.
7. A fullerene (also called a buckyball) is a form of carbon in which carbon atoms
are arranged in hollow spheres.
8. Pyrolysis is the process of decomposing a substance by the action of heat.
9. A fullerene is used for cutting and grinding tools as well as for rings and other
pieces of jewelry
10. Diamond is relatively soft and slippery. It is used as a lubricant.​