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pencil lead is just carbon

Graphite or pencil lead is an allotrope of carbon meaning that the atoms exist in different sturctural arrangements. See related links for structure of graphite

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โˆ™ 13y ago
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โˆ™ 14y ago

The core in pencils is made of graphite. It is a form of carbon where each atom is connected to three others via sp2 covalent bonds to form 'graphene' sheets; these sheets are then connected together by weak bonds (van der Walls forces) and have and interlaminar shear strength of only 34 MPa. Its formula is simply C(s), meaning that it is just elemental carbon in the solid state.

Staedtler Product Information: (composition varies by manufacture)

Pencil Number, Graphite %-wt, Clay %-wt, Wax %-wt

9H 41% 53% 5%

8H 44% 50% 5%

7H 47% 47% 5%

6H 50% 45% 5%

5H 52% 42% 5%

4H 55% 39% 5%

3H 58% 36% 5%

2H 60% 34% 5%

H 63% 31% 5%

F 66% 28% 5%

HB 68% 26% 5%

B 71% 23% 5%

2B 74% 20% 5%

3B 76% 18% 5%

4B 79% 15% 5%

5B 82% 12% 5%

6B 84% 10% 5%

7B 87% 07% 5%

8B 90% 04% 5%

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โˆ™ 7mo ago

Pencil lead is made of graphite, which is a crystal form of carbon. The chemical composition of pencil lead is mainly carbon (C). The molecular formula for graphite is C.

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โˆ™ 14y ago

The pencil is a writing instrument, not a substance.

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Q: What is the chemical composition and formula for pencil lead?
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Related questions

What is the chemical element of lead?

The chemical symbol for lead (element) is Pb. THe formula is Pb2 Pencil lead however, is a mix of graphite and clay.


How is pencil lead a mineral?

Pencil "lead" is not actually lead; it is made from a mineral called graphite. Graphite is a crystalline form of carbon that is naturally occurring and meets the criteria to be classified as a mineral based on its chemical composition and physical properties.


Is pencil lead homogeneous?

Yes, pencil lead is homogeneous because it is a mixture of graphite and clay that is uniform in composition throughout. This uniformity allows the pencil lead to have consistent writing properties.


What is the formula for pencil lead?

The formula for pencil lead is a combination of graphite mixed with clay. The most common type contains graphite and clay in a ratio of approximately 80:20. The clay acts as a binder to hold the graphite together and determine the hardness of the lead.


What is the chemical formula of lead sulphate?

The chemical formula of lead sulfate is PbSO4.


Lead acetate chemical formula?

The chemical formula for lead (II) acetate is Pb(C2H3O2)2.


Why is sharpening a pencil a physical change?

Because the pencil is made of wood and you only changed the size and shape of the wood or pencil and did not change what the wood is made of the substance


Formula for lead IV chloride?

The chemical formula for lead(IV) chloride is PbCl4.


What is the chemical formula for lead and nitrogen?

The chemical formula for lead is Pb and for nitrogen is N.


What is the chemical formula for Pb F2?

The chemical formula for lead(II) fluoride is PbF2.


What is the chemical formula for lead phospahte?

The chemical formula of lead(II) phosphate is Pb3(PO4)2.


What is the chemical formula of lead II chromate?

The chemical formula of lead II chromate is PbCrO4.