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sensory chemicals Essay Examples

493 total results

The Characteristics, Types, Uses, Oxides, Acids, Salts, Place in Biochemistry, and Properties of Phosphorus, a Chemical Element (908 words, 4 pages)

In 1669 the German alchemist Hennig Brand discovered the chemical element known as phosphorus. The element got its name from the Greek phosphoros, meaning "light bearing," because in the dark and in moist air it can be seen to glow with a dull white light.For a time early scientists thought ... Read More

An Analysis of the Relationship Between Chemical Stimuli and Their Effect of the Heart Rate (656 words, 2 pages)

Introduction The purpose of this investigation was to test the null hypothesis that there is no relationship between different chemical stimuli and their effect on the heart rate. To be able to see the effects of the different stimuli a Daphnia was used, or as some people call them a ... Read More

The Characteristics, Source, and Use of Benzene, an Organic Chemical Compound (514 words, 2 pages)

Benzene, C(6)H(6), is a clear, colorless, flammable liquid that is insoluble in water. Its boiling point is 80 degrees C (176 degrees F). In the past benzene was obtained from the distillation of coal in the absence of air. Today most benzene is made synthetically from petroleum products.The benzene is ... Read More

An Analysis of the Topic of the Teenager Music and the Chemical Eeg (1279 words, 2 pages)

When teenagers listen to music, does it make them depressed? Does listening to music make them happy? Some people think it does affect them and others do not. Regardless if the person likes music or not it is involved some way in that persons life whether its by playing an ... Read More

The Characteristics, Sources, and Uses of Nitrogen, a Gaseous Chemical Element (472 words, 2 pages)

Nitrogen, the gaseous element that makes up the largest portion of the earth's atmosphere, was discovered by the British physician Daniel Rutherford in 1772 and recognized as an elemental gas by the French chemist, Antoine Laurent Lavoiser about 1776. Nitrogen, symbol N, was derived from Greek, it means liquid air. ... Read More

The Importance of Chemical Reactions in Chemistry (2006 words, 8 pages)

Chemical reactions are the heart of chemistry. People have always known that they exist. The Ancient Greeks were the firsts to speculate on the composition of matter. They thought that it was possible that individual particles made up matter. Later, in the Seventeenth Century, a German chemist named Georg Ernst ... Read More

Observation Before and After a Chemical Experiment (1801 words, 5 pages)

Observations Before Experiment Barium Hydroxide. Ba(OH2) . 8H2O -The barium hydroxide appeared to have a slight tint of blue giving it the appearance of an off white substance. -The substance needed to be crushed or grinded down into finer pieces to allow for better reaction with the ammonium thyocyanate, NH4SCN. ... Read More

The Devastating Long-Term Effects of Chemical Weapons in the Middle East (686 words, 1 pages)

On September 11,2001, the United States faced, what we saw as the most horrific form of terrorism. On March 16,1988, the northern Iraqi city of Halabja endured the greatest chemical and biological assault on a civilian population in the history of mankind. Today this is our worst fear, being bombed ... Read More

The Chemical Properties of Electrolytes (614 words, 3 pages)

Electrolytes are liquids that conduct electricity. Most need to be dissolved into water or another solvent. Batterys have an electrolyte in them, either as a liquid or as a paste. Liquid electrolytes are used in electrolysis, electroplating, and other chemical processes. When electrolytes dissolve they release positive and negative ions. ... Read More

Pros and Cons of Chemical Plants (365 words, 2 pages)

In the twenty first century, countries want to boom and expand their economy. Within the past 15 years, countries develop their economy by building large factories because they are the foundation of capitalism. Some believe that factory has advantages if set up near the community and some refute this. Those ... Read More

The Chemical Aspects and Basic Characteristics of Iodine (1157 words, 4 pages)

Iodine can be described as the heaviest among the regularly occurringhalogens, which are specifically found in Group 17 (VIIA) within theperiodic table. The periodic table involves a diagram that demonstrateshow chemical compoundselements are associated with one another.Iodine's chemical aspects are identical to the highly placed lighterhalogens which include chlorine, bromine, ... Read More

The Physical and Chemical Properties of Carbon (832 words, 2 pages)

Imagine the same year our California mission, San Luis Obispo is founded, the French Scientist Antoine Lavoisier came to the conclusion that diamonds and charcoal were both different forms of carbon(15). The real interest lies in how Lavoisier and other chemists came to this conclusion. It was 1772, that humanity ... Read More

Chemical Signalling Characteristics Exhibited by Daphnia Carinata (936 words, 2 pages)

Throughout the animal kingdom chemical signalling is widely used. It isused for mate signalling, as alarm signalling and in predator preyrelationships. In some cases the predator can used pheromones releasedby the prey to find them. One example of that is the German wasp whichis attracted to the mating pheromones of ... Read More

Published: Friday 25th of January 2013