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it is because sweat and other substances especially colored ones may be present there. so it is best not to touch chromatogram papers to aviod contaminating it and getting erroneous results..:) chem.student..:)

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How would you measure the pH of an unknown colourless solution?

You can measure the pH of an unknown colorless solution using a pH meter or pH paper. Simply dip the pH meter probe or pH paper into the solution and observe the reading or color change to determine the pH level of the solution.


What happen oil when placed on brown paper?

When oil is placed on brown paper, it can make the paper translucent or translucent due to its ability to seep through and saturate the paper fibers. The paper may become greasy or oily to the touch, and it may leave a stain or mark on the paper surface. Over time, the oil may cause the paper to become wrinkled or discolored as it dries.


What are 3 properties of bases?

Bases have a bitter taste. Bases feel slippery to the touch. Bases turn red litmus paper blue.


To burn a piece of paper why must the paper touch the flame?

Metals conductThe coin is made of metal or a metal alloy. Metals are excellent conductors of heat and electricity. When you place the paper and coin directly over the flame, the coin conducts heat away from the paper. If the coin conducts heat away from the paper at least as fast as the flame adds thermal energy to the paper, it will not reach its flash point and will fail to ignite. It may not even scorch. If the coin, however, cannot dissipate the heat to the surrounding air and itself heats up, it will no longer act as an efficient conductor, and the paper will eventually burn.Though not nearly as much, I imagine it also has some to do with the slight lack of oxygen that is available with the coin over the paper.


Why must the paper touch the flame to burn a piece of paper?

The products contain more energy than the reactants.

Related Questions

How many hands will a paper dollar bill touch in circulation?

200


Why is it important in the amino acid chromatogram not to touch the paper with your fingers or hand?

The oils in your skin will contaminate them and affect the polarities of the substances affected by capillary action. The purpose of chromatography is to determine the components of a substance based on polarity. If the medium used to analyze the components is compromised then you will not arrive at a true answer.


Can you touch Elf on the Shelf with paper?

Yes, you can touch Elf on the Shelf with paper. The rules typically state that the magic of the Elf on the Shelf only disappears if the elf is touched by human hands. Using paper to touch the elf would not break this rule.


Why should you not touch switches with wet hands?

shock


If you touch opossum poop what should you do?

wash your hands hahah


What should you never touch with wet hands?

Your right elbow.


What are two things US flag should never touch?

It shouldn't touch anything but gloved hands


What three things should the US flag never touch?

The U.S. flag should never touch the ground, water, and nothing besides gloved hands


What should you do for the puppies once their born?

put a blanket in there cage and DO NOT TOUCH THEM touching a neborn puppy can make is sore and it could die - im sure you can touch them as long as your hands are clean , meaning that before you touch them to wash your hands .


Why does Miley Cyrus touch fans hands in concerts?

i want to touch peoples hands


Should you wear latex gloves when you go to the bathroom?

yes you should so you dont have to touch things with your bare hands


How should you approach a girl when she starts dancing up against you with her back to you should you touch her in anyway or keep your hands away from contact with her?

put your hands in the air and dance with her. but look cool