yes yes it is
True - the element is carbon
yes it is waterproof
No. Also, "pencil lead" is not lead; it is almost always graphite (made of carbon)
the point, I think, is either the amount of different substances in the graphite/lead, or even the type of eraser...
Pb comes from the Latin word plumbum, and it's the chemical symbol for lead.
Carbon. Diamond and graphite (pencil lead) are allotropes of carbon, meaning different atomic arrangements of the same element. They are also both covalent network solids.
Lead is an element, it is not made of anything but lead. But if you are talking about pencil lead then pencil lead is made of graphite.
carbon.
carbon
Carbon
Water is a compound. A pure metal is an element. Graphite (a pencil lead) is the element carbon. These are all examples of a pure substance.
pencil is hetrogenous because it consists of wood and lead, but if they tell that lead, that will be an element, which symbol is pb.
Both diamonds and pencil lead are made out of the element carbon. The difference lies in their structures: diamonds have a crystal lattice structure, while pencil lead is made up of layers of graphite.
hydrogen
pencil
The element of pencil lead is graphite, which is not actually lead but rather a form of carbon. Graphite is a good conductor of electricity and is commonly used in pencils due to its ability to leave marks on paper.
The chemical symbol for lead (element) is Pb. THe formula is Pb2 Pencil lead however, is a mix of graphite and clay.