Chemical substance Essays

Advancement in chemical research has given companies the ability to make increasingly more effective products. These companies are allowed to manufacture goods with newly discovered synthetic compounds, often without much rigorous testing to determine if they are safe. An apparent correlation between the recent use of industrial chemicals and occurrences of disease in the population has been found, suggesting that they may be harmful to people’s health. Studies have shown that many commonly used

In this experiment, groups were given two different unidentified substances with the goal of being able to figure out what chemical each substance was. Unidentified substance “2” was proven to be Tin (II) Chloride and the Unidentified substance “4” turned out to be Sodium Chloride. The conclusion that substance “2” was Tin (II) chloride could be proven due to the fact that it reacted with Zinc and Sodium Hydroxide. When Tin (II) chloride reacted with Zinc, it began bubbling. This occurred because

everyday we come in contact with hazardous chemicals. These contaminants can be found in anything from plastic bottles to computers, from cosmetics to teflon pans, and from food we eat to the water we drink; the source of exposure is infinite. Chasing molecules by Elizabeth Grossman explores how these exposure happen and what occurs at the molecular level when we come in contact with these offenders. Elizabeth Grossman has researched many of these synthetic chemicals, which in our society are up to ninety

Introduction Forensic chemists test the physical and chemical properties of materials found at a crime scene. They also do similar tests on the materials found on a suspect’s skin or clothing. In this lab, the properties of three known materials will be compared with two samples of “evidence.” The materials and equipment used are less complex than those used by forensic chemists, but the overall method will be similar to the methods they use. The question this experiment attempts to answer is whether

Abstract In this lab we separated a mixture to observe the methods of separating substances from one another using a series of techniques. In this lab we used magnetism, filtration, and evaporation to successfully separate the mixture into three separate components. Throughout the experiment we learned that mixtures are two or more substances combine and each substance retains its own properties and chemical identity. Purpose The purpose of this lab is to recognize the different techniques in separating

compound in order to properly dispose it. The process of disposal is very important when dealing with chemicals. Some chemicals are very

an unknown number was given and the number was F9. As the unknown sample was weighed, the mass was found to be 2.19 grams. After, the unknown sample was divided into six test tubes with about less than 0.5 grams. Approximately 5 mL of different chemical solvents was poured into each tube. All six test tubes had to labeled by the name of solvents. After the solutions were being placed into the sand heat bath, find which of the solutions indicate dissolvent. As far as heating, methanol

components in concentrated zone on or in phase different from those in which they are originally present , irrespective of the nature of the force or forces causing the substances to remove from one phase to another . ’’ (Williams et al, 1952) In this chromatography consists in applying a small drop of solution that is containing the substances to be separated to a strip of filter / chromatography paper short distances from one end(Figure 2) . The drop is allowed to dry , and the end of the paper nearest

All goals were met including to identify an unknown compound by discovering the chemical and physical properties of the compounds, as well as the cations and anions, in order to compare the cost effectiveness, safety, and potential yield between the synthesis reactions for that substance. The solubility qualitative results for the unknown compound were that the solute particles completely dissolved in the solvent (water). This results means that the unknown compound is a polar molecule because

deaths and 200,000 resulted in injuries on the nights of December 2 and 3 in the year of 1984. The source of these loss and damages was from the deadly methyl isocyanate gas that leaked from the Union Carbide plant which was an inflammable toxic chemical utilized to produce pesticides. Unfortunately, the small huts that had resided near and were adjacent to the plant were involved in the incident as well. Apparently, two years prior to the disaster, the Bhopal plant were inspected by three engineers

Identifying a Substance Based on Its Solubility ABSTRACT The basis of this report is to elucidate an experiment where an unknown substance is identified solely based on its solubility. This experiment was conducted in a very lengthy manner due to the precise process of dissolving the unknown substance. It can be inferred that to gain accurate results in the experiment, one must have a developed understanding of how solubility is found. The significance of this experiment is to gain a better understanding

The objective of this experiment was to determine the identity of three unknowns existing in a 1:1:1 mixture. An extraction technique was therefore used to identify the unknown acid, base, and neutral as the compounds must first be separated. Extraction is a method of separation that is based on the difference in solubility of each compound in a mixture. There are a couple of necessary requirements for an extraction to be completed with experimental success. In this extraction there were two liquid

Purpose/Question This lab was made to find out what the possible methods are, such as sand in a plastic container with a piece of black polyethylene foam inside the lid, to protect an egg from a two meter drop on a hard floor. What effect does a container of sand have from a two meter drop on a hard floor with an egg halfway buried inside the sand? Background In class we learned that impulse is the change of momentum of an object when that same object is acted upon by a force for a period of

Lab Report By: Amiya Kamal 7B Purpose: The purpose of this experiment is to analyse different substances and see their reaction with each other substances. This experiment is also to examine the particle theory of each mixture. Hypothesis: Subject Hypothesis Water - Salt Homogeneous Mixture The salt will dissolve into the water and it would look cloudy. Water - Flour Heterogeneous Mixture The flour will dissolve into the water but it will still have clumps of flour in it

have to push the lever down all the way. If you do not push hard enough, the toilet will not flush. After the rising potential, you have to wait for the toilet to refill for it to be flushed again(repolarizing). Acetylcholine Muscles release this chemical in order to activate them. Tom is doing bicep curls with dumbbells. As he lifts the weight, he is releasing acetylcholine to contract the muscle. Interneurons

of an unknown substance using its melting/freezing point. To do so, we first heated up the substance until it melted, by using a hot water bath. Next, we let it cool at a constant rate while measuring its temperature data using an online program. From this data, we were then able to obtain a melting/freezing point for that data, which was found to be 61.0°C. Once we had that information, we compared it to accepted values of various alcohols and acids. We found the unknown substance used in this lab

are different substances. Both rings have different properties. Properties are unique characteristics that help identify a substance and distinguish one substance from another. One property is density. Density is the mass in a set volume of a substance. Ring 1 has a density of 5.92g/cm3 and ring 2 has a density of 5.92g/cm3. Density is specific to a substance, every substance only has one density. Both rings have different densities, therefore the substances can not be the same substance. In science

the sludge lab was to determine how many different pure substances were in the sludge by using the methods and techniques we have learned throughout the year. We had to pick separation methods so we could separate our sludge and then test characteristic properties on our separated liquids and solids. This experiment made us use our knowledge on characteristic properties to pick the ones we should test to help us identify our pure substances. Characteristic properties are properties that help identify

September 20th on the CBC News website a story published titled “Dudley George's brother in serious condition after being accidentally set on fire”. This story explains a celebratory walk done by Kettle Point First Nations that took a turn when a group called Stony Point set a protest fire in front of a military camp that was just agreed by the Ottawa government to be returned to the First Nations. The fire was set to show that not all band members where in support of the agreement that was made

The Identity of the unknown, in this case unknown A, was determined to be acetyl salicylic acid. This was determined by comparing the melting points of the purified unknown crystals to the crude unknown. The known melting point range for acetyl salicylic acid is 135°C -136°C. The Unknown’s melting point was slightly off at 128.6°C - 132°C. This can be due to impurities of the crystals during the purification process. There were a few steps in the experiment that may have contributed to impurities