Questions
1. What are the two types of chromatography mentioned in this reader? Use an encyclopedia, other library resources, and the Internet to find out more about these and other chromatography techniques.
2. Luminol is a chemical used by forensic scientists to reveal traces of blood not readily visible to the human eye. Do a search on the Web site http://www.howstuffworks.com to find out how Luminol works.
1) The two types of chromatography mentioned to the reader are the thin layer chromatography and the high pressure liquid chromatography.
ReplyDelete-Alex Smith
1. The first type of chromatography is the thin-layer chromatography. It is used mainly for a bank robbing. For example, a small bomb is placed is a specially packaged money pack. It is triggered when mishandled. Therefore, when a bank robber is ordering a bank teller for money she hands the package the red dye will then explode. Any CSI would be able to tell that the dye is from the bank because of the specific chemical composition.
ReplyDeleteThe second type of chromatography is called High Pressure Liquid Chromatography. HPLC is used for identifying what materials are used in bombs or other explosive devices. However sometimes it doesn't not work.
Another type of chromatography I found was gas chromatography. It is when a gas moves the vapors of a material and it then separates in column form on a material not chemically active.
2. Luminol works because when this chemical is sprayed upon non-visible blood the atoms are broken down by Luminol's atoms. The molecules then rearrange themselves to form new products. Yet, there is more energy in a reactant than a product causing the reactant to lose their extra energy. THe extra energy turns into light photons. The light photons glow in the dark revealing the blood stains of a victim.
mia zarrella
The two types of chroatography mentioned in the reader are HPLC and thin-layer chroatography.
ReplyDeleteLuminol works by rearanging the atoms in blood to be visable by the human eye.
1. the two chromatography techniques used are simple and advanced. the first is similar to the experiment we did in class, with the dye dissolved in solvents and placed on chromatography paper. the second is used to analyze bomb fragments, which is called high pressure liquid chromatography. first, the sample is studied with a microscope, then dissolved in water. then it is placed under pressure to separate it further. gas chromatography is another technique used that utilizes gas to move solvents through a column, where they are separated.
ReplyDelete2. Luminol is used in forensics to illuminate otherwise invisible traces of blood through a chemical reaction.
1. The two types of chromatography are thin layer and high-pressure liquid chromatography.
ReplyDelete~Shannon emrich