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scissors
metal
Plastic

the chemical formula of scissors:
C15H17N.

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Desk
wood / metal
Shellac

Chemical Composition
Carbon | 0.15 | 0.08 | 0.08
Sillicon | 1 | 1 | 1
Manganese | 7.5 to 10.0 | 2 | 2

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Highlighter, ink, plastic

Plastic: Polyethylene/polyester beads
Chemical composition:
Pyradine C5H5N
Triphenylmethane C19H16
Xanthene C13H10O
Coumarin C9H6O2
Fluorescein C20H12O5

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Notebook
Paper
Plastic

Chemical composition
Paper - 90–99% cellulose fibers (C₆H₁O₅)n
Plastic - ethylene C2H4, propylene C3H6, vinyl chloride C2H3Cl and styrene
(C8H8)

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Rubber / Eraser
synthetic rubber

Chemical Composition
22 - 41 wt% styrene-ethylene/butylene-styrene block copolymer;
5 - 15 wt% ethylene/propylene copolymer;
30 - 50 wt% calcium carbonate;
10 - 25 wt% factice;
0.1 - 7 wt% pumice.
CH₂C(CH₃)=CHCH₂]n

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Eraser
Rubber
Ink

Chemical composition
Rubber: isoprene(C5H8)

Ink:  solvents, resins, alcohol(C2H5OH) , lubricants, carbon, pigments, dyes, aniline, dextrine, glycerine, fluorescents and other materials.

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Pencil
Graphite powder
Clay binder

Graphite powder - Graphite is a crystalline form of the element carbon. It consists of stacked layers of graphene. Graphite occurs naturally and is the most stable form of carbon under standard conditions.

Clay binder - The composition may comprise sodium bentonite, a mixture of sodium bentonite and calcium bentonite, a mixture of sodium bentonite and kaolinite, or a mixture of sodium bentonite, calcium bentonite, and kaolinite, among other mixtures of clay materials.

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books
paper
plastic

chemical composition:

Ink. Carbon (most abundant element in ink) Color pigment. red.

C20H6Br4Na2O5. blue. C19H16. yellow. PbCr4. Gum arabic. arabinose. C5H10O5. galactose. C6H12O6. honey. fructose. C6H12O6. glucose. C6H12O6. water. H2O.

Paper. cellulose. C6H10O5. lignin. C9H10O2,C10H12O3, C11H14O4. china clay. Al2Si2O5(OH)4. hydrogen peroxide. H2O2.

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Pencil
wood
sellac

Chemical Composition
graphite (~65%) -
Graphite is a mineral composed exclusively of the element carbon. Graphite has the same chemical composition as Diamond, which is also pure carbon, but the molecular structure of Graphite and Diamond is entirely different. This causes almost opposite characteristics in their physical properties.
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clay (~30%) -
Clay minerals are composed essentially of silica, alumina or magnesia or both, and water, but iron substitutes for aluminum and magnesium in varying degrees, and appreciable quantities of potassium, sodium, and calcium are frequently present as well.
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a binder (wax, resins, or high polymer) -
Binders are often supplied as an aqueous latex emulsion (40–60% solids of polymeric resin binder, in water). Polyvinyl acetate (PVAc) polymers and copolymers are the well-known polymeric resins suitable for binders for wall repair compounds.