how is pencil lead made?
411098
Liquid graphite is poured into a mold and baked until hard.
341963
Simple:  Graphite is mixed with various amounts of clay in order to create different values of pigment.  \nThe lead "hardness" ranges from HB (super soft and DARK pigment -the higher the # followed by HB, the softer the clay with a higher content of graphite) to high #'s (not followed by an HB).  The higher the # on the opposite side of the scale, the harder the clay with diminishing amounts of graphite.  \n\nA #2 pencil has just the right amount of pigment to be read by scan-tron machines and is easier to erase than darker leads when mistakes are made.
278440
When was the pencil invented?\n\nSome time prior to about 1560, graphite was discovered near Borrowdale, England, supposedly when a large tree was uprooted in a storm, exposing a black substance beneath its roots. The usefulness of graphite as a marking substance was quickly realized. Though the exact date is not known for certain, the year 1565 marks the first record of a pencil consisting of a piece of graphite inserted into a wood shaft, making the first ancestor of today's pencil.\n\n--------------------------------------------------------------------------------\nWhere was the pencil invented?\n\nSince graphite was discovered in England, it is most likely that the first pencils were made in England, though this is not known for certain. The pencil was further developed by European craftsmen.\n\n--------------------------------------------------------------------------------\nWho invented the first pencil?\n\nIt is not known who invented the first pencil. The pencil was first documented in 1565 by Conrad Gesner, and its invention is sometimes attributed to him, though this is unlikely. European craftsman (woodworkers) were the first known pencil manufacturers, and it wasn't until the late 1700's that manufacturing techniques similar to those practiced today were developed.
54163
More and more of today's erasers are made from something other than rubber! While some of the "pink" erasers you find on pencils are made from synthetic rubber blended with pumice (a grit that enhances its ability to erase), an increasing number of erasers are made from vinyl. Vinyl is a type of durable, flexible plastic.
12574
kind of.  these days, pencils are made of graphite, which is not harmful like lead is.  it can get caught under the skin, in which case you'll have a blackish gray mark underneath the surface indefinitely (i have one on my thumb).
757703
I've seen it done in period films where a person licks the tip of a quill (maybe to clean off any dry ink). Some people do it lubricate the ball in a ball-point pen, but I really don't think it helps at all. I guess they just think it looks cool.\n\nLicking the 'lead' in a pencil can not harm you because it is not really lead. It is actually graphite. All modern pencils are made with it. So, there's not way you can get lead poisoning
70214
WITH A PENCIL AND PAPER
31832
Any metal will melt on heating (unless burning up before), but for pure lead the melting point is fairly low with 600K (327°C, or 621°F). The melting point for lead alloys (with tin and/or antimon) is even lower.\n\nEven candle flames emit sufficient heat to melt down lead placed on a spoon in reasonable time.
831216
Cu (s) + Pb(NO3)2 (aq) ---------> No Reaction. \nCopper will not replace lead.\n\nreaction VI in the attached link.
18116
Pencils are made industrially by mixing finely ground graphite and clay powders, adding water, forming long spaghetti-like strings, and firing them in a kiln. The resulting strings are dipped in oil or molten wax which seeps into the tiny holes of the material, resulting in smoother writing. A juniper or incense-cedar plank with several long parallel grooves is cut to make something called a slat, and the graphite/clay strings are inserted into the grooves. Another grooved plank is glued on top, and the whole thing is then cut into individual pencils, which are then varnished or painted.\n\nMany pencils, particularly those used by artists, are labelled on the European system using a scale from "H" (for hardness) to "B" (for blackness), as well as "F" (for fine point). The standard writing pencil is "HB". However, artist's pencils can vary widely in order to provide a range of marks for different visual effects on the page. A set of art pencils ranging from a very hard, light-marking pencil to a very soft, black-marking pencil usually ranges from hardest to softest as follows:\n\n9H 8H 7H 6H 5H 4H 3H 2H H F HB B 2B 3B 4B 5B 6B 7B 8B 9B \n\nThis translates between American and European ranges thusly:\n\nU.S.      Europe\n#1     =     B\n#2     =    HB   (most common)\n#2 1/2 =     F   (also seen as 2 4/8, 2.5, 2 5/10,   due to patent issues)\n#3     =     H\n#4     =    2H\n\nSo, as you see, the #2 pencil is used because it is a "lead" density that isn't too hard or too soft for writing in standard writing use.\n\nI am an artist and use all of these various types of pencils.  \n\nBTW, there is no actual Lead in pencils.  That is a myth.
592082
because pencil lead (lead is a misnomer here of course) is made of graphite. graphite doesn't dissolve at all in many solvents so will not move with the mobile phase. inks on the other hand can be made from a wide variety of organic molecules and thus can run with the solvent. using an ink pen is like adding another spot to the plate.
465571
Let: \nx = amount of soldering lead produced\n63%x = 520\nx = 825.4 grams
532503
go to www.lead.com.sg
43627
Pencil lead comes in various hardnesses, and there are many more than 3 ratings.\n\nSofter lead, makes a darker, wider mark.  Lighter lead makes a lighter, thinner mark.
750866
The mineral with the metal in it is an ore. For example the mineral Galena is lead sulphide, from which lead is extracted.\nThis mineral will typically grow in quartz veins; these surrrounding minerals holding the ore are called "gangue" minerals.  But often the veins are so narrow you have to dig out a fair bit of the so-called country rock either side of the vein; this is "waste rock" or "mullock".\n\nSo although Galena is over half lead by weight, lead might only for m a few percent of the total material dug out.
715971
Gold would be deposited on the surface of the lead.\n\n3Pb + 2Au(NO3)3 ---> 3Pb(NO3)2 + 2Au
1157731
maybe there's lead in it.\n\nnickel, zinc, iron, magnesium, etc.