Free Chemistry Essay Examples and Topics | Page 21

Determination of Mercury Content in Canned Tuna Brands Chemistry Literature review

15 pages (4367 words) , Download 2 , Literature review

Free

Due to population growth and urbanization, more human activities have significantly contributed to the elevated mercury levels in the environment. It has been reported that more than 2500 tons of mercury emissions occur annually through anthropogenic sources.

Preview sample

Emulsifying and Emulsion Stabilizing Role of Proteins Chemistry Essay

6 pages (1628 words) , Download 6 , Essay

Free

Food emulsions are oil-water dispersion systems, in which Proteins Play The Emulsifying And Emulsion Stabilizing Role. The formation of an emulsion necessitates a high input of energy and the presence of at least one emulsifier in the system in order to aid in reducing the interfacial tension between water molecules and oil molecules.

Preview sample

sponsored ads

Hire a pro to write
a paper under your requirements!

Win a special DISCOUNT!

Put in your e-mail and click the button with your lucky finger

YOUR PRIZE:

—

Apply my DISCOUNT

Physics Thermodynamics Lab Chemistry Essay

5 pages (1450 words) , Download 2 , Essay

Free

The rate of temperature change on the left and right sides are very different because there are more particles with a higher temperature that moved from the right side causing the rapid increase in temperature of the system on the left side. Time how long it takes for about 125 particles to exist in each chamber and note the temperature difference the first time this occurs.

Preview sample

Disease Omeprazole for Treatment Chemistry Essay

8 pages (2796 words) , Download 2 , Essay

Free

On its own, the body should be able to either prevent diseases or fight against diseases to ensure constant healing. However, this functionality of the human body is limited to a certain extent as the immune system has not always achieved disease prevention and disease defenses. It is against this background that it is necessary that third-party disease-fighting defenses be introduced.

Preview sample

Ylindrospermopsin Alkaloids Chemistry Research Paper

10 pages (2500 words) , Download 2 , Research Paper

Free

The report has been created by making use of research conducted on the bioaccumulation of cylindrospermopsin. The paper also contains a discussion related to the factors that influence both bioaccumalation rates as well as potential. The paper will determine production of cylindrospermopsin in one type of cyanobacteria, that is known as Anabaena.

Preview sample

The Synthesis of Sulfanilamide Chemistry Lab Report

4 pages (1000 words) , Download 3 , Lab Report

These were the first efficient drugs to treat and prevent bacterial infections. Generally, sulfa drugs contain sulfomide structure. Most of these drugs are antibiotics and they act by inhibiting folic acid biosynthesis. The general structure of sulfa drugs is as indicated in the graphic below.

Preview sample

The urinary system Chemistry Assignment

4 pages (1000 words) , Download 3 , Assignment

Examples of such ailments include chronic urinary tract infections, glomerulonephritis and diabetes mellitus. One of the most cost effective and efficient method of urine analysis is the use of a paper or plastic dipstick to screen the urine. A microchemistry technique, dipstick urinalysis method allows for enhanced semi-quantitative and qualitative in a short span of time through careful visual assessment.

Preview sample

Optical isomerism in Thalidomide Chemistry Essay

3 pages (750 words) , Download 2 , Essay

The victims of the drug worldwide are estimated to range between 10000 and 20000. On the other hand, thalidomide has been recognized as a valuable treatment to other medical conditions and has been prescribed in various other nations. Its use though still remains controversial.

Preview sample

Mixture and compound Chemistry Essay

3 pages (750 words) , Download 2 , Essay

A compound on the other hand, is a pure substance made of two or more chemically combined elements. Compounds are separable by chemical means such as electrolysis, oxidation and reduction (Phillips, 1998). A mixture and a compound also vary on the composition of the component elements.

Preview sample

Air pollution Chemistry Research Paper

4 pages (1000 words) , Download 5 , Research Paper

With this on hand, the paper will focus on air pollution, including its cause and effect to the environment and the possible solution in order to lessen or terminate air pollution. 2.0 Air Pollution In brief, air pollution is the emission of harmful gasses to the atmosphere.

Preview sample

Case study on Biochemistry Chemistry Essay

4 pages (1000 words) , Download 4 , Essay

Free

When the cycle is incomplete, and the product is not formed, the function of the organism cannot properly take place. Without enzymes, the reactions needed for biological processes of the body would take at a slower rate or fail to take place.

Preview sample

Chemistry Valinomycin Chemistry Essay

7 pages (1842 words) , Download 2 , Essay

Free

The main driving force lies in the structure of valinomycin, it’s made up of 12alternating amino acids and esters which form a macrocyclic molecule, the twelve carbonyl groups are essential for binding K+ Ions also responsible for solvation in polar solvents, the isopropyl and methyl group are responsible for solvation in non-polar solvents.

Preview sample

The Green Oxidation of Cyclohexanol to Cyclohexanone Chemistry Lab Report

4 pages (1213 words) , Download 4 , Lab Report

Free

KMnO4 and Cr (VI) compounds such as H2CrO4 have been widely used as oxidizing agents in the oxidation of alcohols to carbonyl compounds. However, each of these two reagents has its disadvantages, and chemists are increasingly using reagents containing chlorine in a positive oxidation state such as hypochlorite compounds.

Preview sample

Colourimetric Assay for Paracetamol Chemistry Essay

4 pages (1000 words) , Download 3 , Essay

H. Jeffery). Such a method of analysis is ordinarily limited to determinations at relatively low concentrations. In a colourimetric chemical test the intensity of the color from the reaction must be proportional to the concentration of the substance being tested. Some reactions have limitations or variances inherent to them that may give misleading results. Most limitations or variances are discussed with each particular test instruction. In the most basic colourimetric method the reacted test sample is visually compared to a known color standard. However, the eyesight of the analyst, inconsistencies in the light sources, and the fading of color standards limit accurate and reproduci

Preview sample

COLOURIMETRY PARACETAMOL Chemistry Essay

4 pages (1000 words) , Download 6 , Essay

Free

When monochromatic light goes through a coloured solution in a cell, a portion of the radiation is taken in and another fraction is transmitted. Colourimetry is a hands-on application of the Beer-Lambert law to establish the proportion of light that is transmitted by a solution containing a coloured solute, and using that information to ascertain the concentration of the solute.

Preview sample

The lumen and absorb Teams at Crutchfield Chemical Engineering Chemistry Case Study

7 pages (1750 words) , Download 4 , Case Study

Free

Premium+

One must, first, assume that the organizational structure and reward systems in place for top performance are not the catalysts for high productivity or low productivity since intrinsic motivations are highly individualized and in-born.

Preview sample

Atomic Theory Webquest Chemistry Book Report/Review

4 pages (1000 words) , Download 2 , Book Report/Review

b. Who developed it? The law of conservation of mass was developed by Antoine Laurent Lavoisier, a French chemist, in 1789 (Lavoisier and the Law of Conservation of Mass). c. Describe the experiments this person carried out that led to the law’s formulation.

Preview sample

Structure of Enzymes and Their Role in Metabolic Reactions Chemistry Assignment

6 pages (1975 words) , Download 2 , Assignment

Free

The amylase inhibitors attach to the enzymes and hinder the enzymes from recognizing the starch molecules thus affecting the chemical reactions as well. As far as the effect of temperature and pH is concerned, it has been obtained that with an increase in temperature of the environment, the rates of reaction also increase.

Preview sample

Use of differential scanning fluorimetry as a high-throughput assay to identify nuclear receptor ligands Chemistry Article

4 pages (1000 words) , Download 2 , Article

Free

Use of differential scanning fluorimetry as a high-throughput assay to identify nuclear receptor ligands A number of experimental techniques are usually used to screen possible ligand materials against nuclear receptors, however, none of the current assay screening techniques permits screening without modification of either the protein and/or the ligand in a high-throughput fashion.

Preview sample

Explanation of how alcohol is metabolised in a human body Chemistry Essay

4 pages (1000 words) , Download 2 , Essay

However, the stomach contributed to the metabolism of alcohol through the gastric ADH. The alcohol that is fragmented down in the human body is converted to acetaldehyde. After this, the acetaldehyde is converted into acetic acid radicals that are also referred to as acetyl radicals.

Preview sample

Chapter 12: Biosignaling Chemistry Term Paper

3 pages (750 words) , Download 3 , Term Paper

Free

The functions of these signals usually form the fundamental basis of life. According to the Biosignaling, the bacterial cells of receive constant signal input from the membrane proteins that are information receptors.

Preview sample

Alchemy as an Ancient and Often Misunderstood Art Chemistry Essay

3 pages (927 words) , Download 3 , Essay

Free

Alchemy has a rich history involving several fields of study including philosophy, metallurgy, astronomy, medicine, and chemistry. The objectives and outcomes of alchemic experimentation and studies vary widely. Included are the attempts to discover a liquid that extends life and transforms base metals into more valuable metals through the use of philosopher’s stones.

Preview sample

Providing Energy for All the Functions of Living Things Chemistry Assignment

3 pages (750 words) , Download 6 , Assignment

If the yeast is grown in the presence of sodium sulfite, ethanal (acetaldehyde) accumulates and its presence can be detected. However, under slightly alkaline conditions in the presence of sodium sulfite, pyruvate accumulates but ethanol does not. The sequence of these metabolites during glycolysis in yeast.

Preview sample

Why Is the Pharmaceutical Industry One of the Most Regulated Industries in the World Chemistry Essay

3 pages (983 words) , Download 4 , Essay

Free

The problems regarding the safety of drugs are a common problem in the existing world today, that is in both developing and developed countries. Some of the incidences have ended up in accidents, most often the children being victims. These are caused by using drugs that contain toxic impunities or substances.

Preview sample

How Does The Drug Molly Work Chemistry Essay

4 pages (1000 words) , Download 2 , Essay

Awareness of drugs, their negative effect and threats they pose, may help you keep aside. There exist different types of drug and each of them may make a person addicted. Molly is one of the most dangerous synthetic drugs, thus it consists of chemicals. It is the powder of crystal form, known as MDMA ((3,4-methylenedioxy-N-methylamphetamine), methylenedioxymethamphetamine, 4-methylenedioxymethamphetamine or Ecstasy.

Preview sample

Kinetic versus Thermodynamic Control in Competing Reactions Chemistry Lab Report

7 pages (1750 words) , Download 14 , Lab Report

Free

Center of discussion in this paper is cyclohexanone semicarbazide, a component having a molecular formula written as C7H13N3O, as well as a molecular weight of about 155.1976. Its two dimension structure are represented in following research. Cyclohexanone semicarbazone adopts a distorted conformation chair with a high total puckering of the rings that are numbered.

Preview sample

Methanol to acetic acid Chemistry Assignment

4 pages (1000 words) , Download 2 , Assignment

At the moment, a majority of industrial undertakings in acetic acid production are dominated by methanol carbonylation and the oxidation of hydrocarbons such as ethylene, acetaldehyde among others. Advances in acetic acid synthesis and catalysis can be grouped into five broad categories.

Preview sample

Ethanol vs Methanol as Gasoline Supplement Chemistry Research Paper

7 pages (1940 words) , Download 2 , Research Paper

Free

The volatility of a hydrocarbon determines the type that is going to be used in the manufacture of gasoline. Crude oil needs distillation and refining to make gasoline because crude petroleum comprises hydrocarbons more or less volatile than gasoline. Gasoline is made up of hydrocarbons molecules hydrogen and oxygen and carbon that can be oxidized to form water and carbon dioxide.

Preview sample

The Analysis of Thermodynamics and Kinetics Chemistry Assignment

4 pages (950 words) , Download 2 , Assignment

Free

This is the thermodynamic mass. Kinetics defines a reaction rate and time taken to arrive at equilibrium, while thermodynamics provides details about the products obtained from the balance of a reaction. In organic transformations, a kinetic response is more stable in its reactant state. An injection of energy is needed to shift the reaction.

Preview sample

Dynamic Function Relationships Chemistry Research Paper

5 pages (1250 words) , Download 2 , Research Paper

To achieve this, the study used the mode of experiment B-factors from the PDB database, the experimental lists of protein resilience, single molecule pulling, and protein motion by ANM. The experiments for the unfolding protein; protein in pulled apart by AFM, optical trap, and magnetic force, and proteins other unfold when heated.

Preview sample

E cigarettes Chemistry Research Paper

6 pages (1500 words) , Download 4 , Research Paper

Free

Known as the e cigarette, the contraption is meant to aid the smoker in getting off his nasty smoking habit bu giving him the nicotine fix that he so craves, without the negative effects that smoking a cigarette gives. Or does it?

Preview sample

Distillation- Gas Chromatography Investigations Chemistry Lab Report

4 pages (1000 words) , Download 4 , Lab Report

This energy is utilized by the molecules to change phase, that is, from the liquid phase into the gas phase. The temperature at which the liquid changes into vapor, in which case, the vapor pressure of a liquid at this temperature equals to the atmospheric pressure, and it is referred to as the boiling point.

Preview sample

Devices for Measuring Carbon Dioxide Pollution Chemistry Essay

6 pages (1752 words) , Download 2 , Essay

Free

Over the last several decades, the concentration of CO2 in the atmosphere has increased significantly. This increase is a result of the increased combustion of oil, coal, natural gas, and other carbon compounds. Carbon dioxide is one of the greenhouse gases, and scientists around the world express concern over the rising levels of CO2 in the atmosphere.

Preview sample

Interactions of hazardous materials Chemistry Essay

2 pages (500 words) , Download 2 , Essay

Free

The NFPA diamond with a 0 at 12 o'clock, shows that the liquid will not catch fire, a 2 at 3 o'clock shows that the liquid will undergo violent chemical change under normal conditions, a 4 at 9 o'clock shows that the liquid is deadly and it should not be inhaled or allowed to touch a body part under any condition.

Preview sample

Literature Search/Review Assignment on The role of excipients in tablets Chemistry Literature review

4 pages (1000 words) , Download 2 , Literature review

It is worth noting that the quality, concentration, and selection of excipients could directly influence the pharmacotherapy outcome.2 A change in the components such as the change in the quality or quantity of excipients might alter the quality of the finished product, efficacy or quality.

Preview sample

Organic compound boiling points Chemistry Essay

4 pages (1000 words) , Download 2 , Essay

Thus, in descending order, the boiling points are: 1-Hexanol> 1-Pentanol > 3-Methyl-1-Butanol > 3-Methyl-2-Butanone Boiling points are temperatures at which the vapour pressure of the liquid, equals that of the gas pressure above it (Hill & John, 2011: p32).

Preview sample

Element Silver Chemistry Book Report/Review

3 pages (750 words) , Download 2 , Book Report/Review

There is no clear identification of the person who discovered the element silver in the literature (Dhillon). The place where silver was first mined is Anatolia that makes part of the modern Turkey. Silver was mined for the first time in the start of 4000 B.C.

Preview sample

Detecting the Cylindrospermopsin using HPLC-PDA and NMR Chemistry Assignment

5 pages (1250 words) , Download 2 , Assignment

Free

Cylindrospermopsin is a liver toxic alkaloid produced mainly by the cyanobacteria Cylindrospermopsis raciborskii albeit the toxin is also produced by Umezakia nations and other bacterial species. This toxic alkaloid is of great concern to the public health sector since it is highly soluble in water because it has both positive and negative charges.

Preview sample

A Density of a Substance Chemistry Lab Report

3 pages (968 words) , Download 2 , Lab Report

Free

A density of a substance pertains to an intensive property of matter which relates mass to volume, where such density equals mass (m) per unit of volume (v). Intensive properties are independent of the quantity of substance and in the experiment, Archimedes’ method of displacement ought to be employed in determining the density of a penny.

Preview sample

Current Issues in Forensic Science Chemistry Essay

2 pages (955 words) , Download 2 , Essay

Free

The health and safety of an individual depend on the integrity of the product on several occasions. The dependants of clinical medicine receive their protection measures from the government-imposed, regulated quality assurance and quality control. However, the defendants, victims and the public receive their protection.

Preview sample

Pharmacology Glyceryl Chemistry Essay

6 pages (1780 words) , Download 3 , Essay

Free

No inhalation of the spray should take place. An initial one-metered dose ought to be sprayed below the tongue at an attack’s onset, followed by another metered dose within a period of five minutes should pain relief not occur. It is recommended that it should not exceed two metered doses. To prevent exercise-induced angina and other precipitation-related conditions, at least one metered dose.

Preview sample

Naloxone Drug Profile Chemistry Essay

7 pages (2269 words) , Download 2 , Essay

Free

Orally administered, Naloxone undergoes a wide metabolism in normal subjects. It is minimally absorbed when given orally as it is quickly destroyed in the GI tract. Many greater doses are needed when using oral administration for any pharmacologic effect. Naloxone is absorbed in the liver, mainly through glucuronide conjugation, and eventually excreted from the body system in the urine.

Preview sample

The use of isotopes in medicine Chemistry Essay

5 pages (1250 words) , Download 3 , Essay

This leads to a difference in the atomic mass although the atomic number is the same (McKinney, et al, 1995). However, since neutrons are chemically in active, the difference caused by neutrons does not affect the atoms chemically. As a result, isotopes have similar chemical reactions, but only differ physically due to their atomic mass difference.

Preview sample

Isotopes in archeology Chemistry Essay

5 pages (1250 words) , Download 2 , Essay

Except for hydrogen, all other known stable atoms have protons and neutrons in equal numbers, this balance is absent in the case of isotopes. The atomic number of an element is determined by the number of protons present on its atom, while the atomic mass is calculated based on the present neutrons (Saunders and Katzenberg, 1992).

Preview sample

The use of isotopes in agriculture Chemistry Essay

5 pages (1250 words) , Download 3 , Essay

They have no electrical charges and light electrons which are negatively charged. The light electrons that are negatively charged are said to occupy the biggest volume of atoms and they determine how a specific atom interacts with other atoms (NSAC, 2009).

Preview sample

The Use of Isotopes in Medicine Chemistry Essay

6 pages (1680 words) , Download 2 , Essay

Free

This means that isotopes of an element have the same atomic number. This means that isotopes of an element have the same atomic number. Nonetheless, isotopes do not share the same number of neutrons within their nucleus. As a result, isotopes are said to have divergent atomic weights. There are two major types of isotopes.

Preview sample

The Use of Isotopes in Medicine Chemistry Essay

5 pages (1250 words) , Download 2 , Essay

Rana, et al. (2012) suggests that isotopes bring about the existence of elements in many forms for example carbon 12 and carbon 14. Chemically, isotopes of a particular element have similar behaviors under similar circumstances. Due to the difference in their masses, isotopes differ physically, which explains why isotopes can be separated through processes such as fractional distillation.

Preview sample

Drug Profile of Pharmacology Chemistry Essay

8 pages (2598 words) , Download 3 , Essay

Free

Opioids are morphine-like synthetic drugs that produce the same effect as that of morphine for pain relief, respiratory depression, constipation, and sedation. Opioids antagonists block the (µ, ? and ?) opioid receptors. (Flomenbaum et al. 2006). Opioid antagonists, when administered before treatment, block the opioid agonists by preventing their action.

Preview sample

The Effect of Activating the Parasympathetic Nervous Systems Chemistry Essay

8 pages (2278 words) , Download 2 , Essay

Free

Identify ONE paramedic indication, then in the subsequent columns, list the molecular target involved in the identified interaction, the type of interaction (i.e. agonist/antagonist / allosteric modulator/inhibitor), and briefly explain how this interaction of the drug with the molecular target accounts for the observed therapeutic effect for that indication.

Preview sample

The Burning Candles Experiment Chemistry Assignment

3 pages (2166 words) , Download 2 , Assignment

Free

Taking into consideration that the number of candles is directly proportional to the rate of the amount of Oxygen consumed, it implies that an increase in the number of candles results in an increase in the amount of Oxygen consumed. On the other hand, the fewer the number of candles used, the less the rate of the amount of oxygen consumed thus the higher the time taken for the candles to go off.

Preview sample

Chemistry Essays