-Pencils were first used in 1662.
-Graphite is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure.
- HB is a graphite hardness/grading scale: the higher the number next to H, the harder and lighter/less dark the pencil lead is.
- The H stands for “hard.”
Is there a picture fo dis question
It produces a hydrazone in which the carbon is attached with the nitrogen atom with the means of a double bond.
Of course they can because…
