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Why is it important to use only a pencil to mark the starting line of the chromatogram?
Wiki User
∙ 6y ago
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
Wiki User
∙ 13y ago
Wiki User
∙ 15y agothe pencil mark will not break down into pigments when you do the chromatography, but most pens etc will. you mark it with a pencil so it will be there when your done with your experiment
Wiki User
∙ 12y agoBecause the pencil doesn't dissolve in water.
Wiki User
∙ 6y agoThe ink (or other soluble materials) from a pencil can interfere with the chromatogram if it is dissolved.
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What are the elements found in pencil lead?
What you see as a pencil line is graphite - carbon. The graphite is held together by a clay which will contain very many elements specific to the clay being used.
Why must the level of the solvent not reach the pencil line where the spots are?
because the colours would mix together, making the results unreliable
Why must the level ofthe solvent not reach the pencil line where the spots are?
if it wouldn't be above the level of solvent the spots will run off
What would happen if you submerge the chromatography paper above the pencil line?
Try and see: if it wouldn't be above the level of solvent, the spots will run off.
Inline elements are normally displayed without starting a new line.?
true
When setting up a chromatogram suggest why the base line where dyes are placed is not drawn with a pen?
The baseline where dyes are placed in a chromatogram is typically not drawn with a pen because the ink from the pen could potentially interfere with the separation of the dyes. Using a pen may introduce additional components into the chromatogram that can affect the accuracy and reliability of the analysis. Instead, a pencil or other non-reactive marking tool is typically used to mark the baseline.
Why is it important that you marked the origin line and component locations on the paper with a pencil and not a pen or marker?
because the pen or marker will run and the pencil will not.Did this answer your question(if this did not you are a complete idiot):)
Is a pencil a line?
No it is not.
Why is it important to use a sharp pencil in biological drawing?
So the drawing is a very fine line and easy to rub out?
Will a line drawn by a pencil conduct electricity?
we know that graphite(pencil lead)conducts electricity.a line drawn by the pencil contains graphite particles.then why can't it conduct electricity?
Example of an straight line in real life?
The piece of lead in a pencil or the pencil.
What kind of pencil used to draw a border line?
Civil ingineer pencil
How to make a line?
draw it with a pencil
What was produced on the assembly line that cost less than half the amount of other cars?
A pencil, possibly! A pencil, possibly! A pencil, possibly! A pencil, possibly!
Is line art the same as pencil art?
not neccessarily, because you can create line art with different medias such as ink. Line art, i think is the usage of lines to create a hidden image. Pencil art is, of course, usage of the glorious pencil.
When your teacher asks you to quote a line what do you do?
i use pencil to draw a line
If a plane contains one point of a line then it must contain the entire line?
No, a plane can contain only one point of a line. Picture a piece of paper with a pencil stabbed through it. The paper is the plane, and the pencil is the line. The pencil/line only touches the paper/plane at one point. Hope this helped! If it did, please recommend me. -Brad
