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Yes, better than ink!
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∙ 13y ago
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What mineral is soft enough to leave a streak on paper?
The mineral graphite is soft enough to leave a mark on paper. We use graphite, which is a form of carbon, as pencil lead. And it works pretty darn well at leaving marks on paper.
Why does it make a difference if you mark chromatography paper with a pencil and not with a flair or ink pen?
Because the ink from the pen will run and smear during the chromatography but the pencil mark is not affected.
What results will it be if using a pen to draw the start line of paper chromatography?
You will get a chromatograph of the dyes in the pen's ink, instead of a reference mark.
What is a pencil lead made out of?
A pencil consists of a thin stick of pigment (usually graphite, but can also be coloured pigment or charcoal) and clay, usually encased in a thin wood cylinder, though paper and plastic sheaths are also used. (Lead) from a pencil is actually graphite which is 100% carbon Graphite and carbon black, all elementary Carbon (C)
Why is erasing a pencil mark a physical or chemical change?
PHYSICAL
What is the graphite of a pencil?
It is the part of the pencil that makes the mark on the paper. Pencils used to use lead for this but the lead has been replaced with graphite.
How do you write with a pencil?
Hold and press the pencil down and drag it across the paper to create friction between the lead and the paper and the lead will produce a mark on the paper which can be rubbed out. You should already know this when you were 5 years old
Why does a pencil leave a mark on paper?
When a pencil is rubbed on paper fiction causes a small amount of the graphite from the core of the pencil to be left on the paper. This leaves a visible mark.
When was the last lead pencil made?
About 3 seconds ago. "Lead" pencils are the graphite ones we use all the time, those yellow things that you sharpen in a pencil sharpener. Lead is dark gray and leaves such a mark on paper. It isn't really lead in the pencil, we just say that.
Why is it important to use only a pencil to mark the starting line of the chromatogram?
This is so you can know the base line. The base line is used as the starting point for the mesaurements used for the Rf values. you need to know the distance from the base line to the point of the spot to know the Rf values. see related link below for more info about paper chromatography
How long is the lifespan of pencil mark on paper?
The answer depends on a variety of variables, but the simplest is that barring further action on the pencil mark (rubbing, wear, etc), it will last as long as the paper.
What minerals is soft enough to leave streaks on paper?
The mineral graphite is soft enough to leave a mark on paper. We use graphite, which is a form of carbon, as pencil lead. And it works pretty darn well at leaving marks on paper.
What mineral is soft enough to leave a streak on paper?
The mineral graphite is soft enough to leave a mark on paper. We use graphite, which is a form of carbon, as pencil lead. And it works pretty darn well at leaving marks on paper.
Why isit necessary to use alead pencil to mark a test paper that will be electrically scored?
Lead conducts eletricity so it is used in order to the computer could read it.
Why does it make a difference if you mark chromatography paper with a pencil and not with a flair or ink pen?
Because the ink from the pen will run and smear during the chromatography but the pencil mark is not affected.
Which best explains why points cannot have a diameter of 0.01 in?
A mathematical point is only a location, and has no dimensions. Of course, when you mark the point on paper, it has the same diameter as the lead in your pencil, or the ball on your BIC.
What was the first kind of pencil?
In ancient Rome, scribes wrote on papyrus (an early form of paper) with a thin metal rod called a stylus, which left a light but readable mark. Other early styluses were made of lead. Today we still call the core of a pencil the "lead" even though it is made from nontoxic graphite.
