lead pen because a lead pencil is a regular pencil.
lead pencil is incorrect because it lead pencil
there is no lead in lead pencil.
The lead pencil was invented on 1564.
No. Lead is a realtively good conductor. The insulator is the wood on the outside of the lead.
lead and scratch
It is a physical change. There are no changes made to the compounds in a pencil by breaking it.
First off, its spelled "breaking". No, Its a physical change, because the pencil hasn't changed its chemical components, all you did was ruin a pencil. :)
lead and scratch
physical change
Nope - it's a physical change. The chemical composition of the pencil is still the same !
lead pen because a lead pencil is a regular pencil.
Pencil lead does not have coal. Pencil lead contains graphite.
lead pencil is incorrect because it lead pencil
there is no lead in lead pencil.
There is no lead in pencil - Pencil is made from graphite
Pencil lead is a compound