We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

Chemistry Essay Examples

Titration In Industry

...Titrations performed in colleges are done manually by using burets. The only significant variation is that carrying out a large number of fundamentally similar routine titration analyses in the laboratory the routine is, simplified and automated. Mainly in relation to the aspect of calculations where the volume of titration is in-put into an Excel spreadsheet, and the results immediately return. In addition after each titration the burette is automatically zeroed and refilled. The size of the sa...

Rate of Isomerism of [Co(en)2Cl2]

...Brasted, R. Hirayama C. 1958 The cis-trans Isomeration of Dichlorbis-(ethylenediamine)-cobalt(III) Chloride and Dichlorbis-(propylenediamine)-cobalt(III) Chloride in Alcohols, Journal of Chemistry, Department of Chemistry, University of Minnesota. Vol. 80 pp 788 – 794. Brown, T. LeMay H. Bursten, B. Murphy, C. Langford, S. & Sagatys D. 2010. Chemistry: The Central Science, Pearson, Australia. pp 1196 – 1197. Christian, G. 2010. Analytical Chemistry 6th Ed., John Wiley & Sons, USA. pp...

Binders Beverage & Landscaping

...To help Bill Binder pick the best route to transport his bottles from his plant to his warehouse we can use the shortest path model. The shortest path model finds how to transport items/people from on location to another while minimizing the total distance traveled, time taken or some other measures. In Bill’s case we will minimize the time it takes to transport his bottles from his plant at node 1 to his warehouse at node 10. A road map for Binder’s Beverage with the nodes and distances sta...

History of organic chemistry

...Now since this class I’ve been observing just how this filter system works. I have discovered that the residue that remains after filtering in some way affected the taste of my regular tap water. I have since learned that this residue consists of salt and other stuff that could definitely dramatically affect the test. Interestingly enough though, this filtration process didn’t start with me. Scientist years ago began to filter water for health reasons. Elements that are deadly to our human b...

The Colligative Property

...Are you familiar with Colligative Properties? Do you know that these properties are all around us, in our daily lives? Better yet, do you know how these properties affect us? Take a look on the inside scoop of what goes on to the water you sprinkled salt on while cooking Alfredo pasta, or the reason behind the salting trucks on the highways of New York City in the winter. Take a minute to learn about a fascinating detail of Chemistry! Colligative Properties are Properties resulting from the rati...

Quantitative Determination of Total Hardness In Drinking Water

...The Complex solutions were formed by titration with the chelating agent EDTA. With the use of complexometric titration the total hardness of water sample was determined. It was found out that the water hardness of Viva mineral water is classified as “hard” in terms of calcium and magnesium ions content that was expressed in terms of ppm CaCO3. The claimed total hardness of Viva Company is larger than the experimental value meaning it has less metal ion content than expected. The results of t...

Cordination Compounds

...* The halide complex of Cu (2) shows two different stereo chemistries. In (NH4)2[CuCl4], [CuCl4]2- ion is square planar, but Cs2[CuCl4] and Cs2[CuBr4], the [CuX4]2- ions have a slightly squashed tetrahedral shape. Tetrahedral [CuCl4]2- ions are orange whereas, square planar [CuCl4]2- ions are yellow in colour. * GREATER STABILITY OF Co(+3) COMPLEXES THAN Co(+2) COMPLEXES; * Co+2 ions are very stable & are difficult to oxidise. Co+3 ions are less stable and are readily reduced by water to Co2...

Vitamin C & DCPIP

......

Lab Safety

...You will need to rinse your eyes under some water for about 15 minutes to get all of the chemicals out. If you see a hand symbol on something, that means you should wear heat resistant gloves. You will most likely need to wear them, because you will be touching something with a very hot temperature and you could badly burn yourself. When ever working with an electrical device, never use it near water. First of all, you could badly electricute yourself, and it could also start a fire which could ...

Physical and Chemical Properties

......

Importance Of Chemistry

...Chemistry is also important for the environment. When you are aware of the harming effects of the gases like carbon dioxide and methane as a result of the greenhouse effect, you can easily carve out solutions for the reduction of effects on the environment. If you go with a minimum knowledge of the importance use of chemistry you can help in saving the environment to a large extent. Though chemistry is thought as complicated and a boring science subject, chemistry is responsible in explaining th...

Beer’s Law Lab Report

...Possible errors that may have occurred during this lab have to do with calibration of the spectrometer. The transmittance values changed second to second so if the timing was not perfect in measuring the samples, the transmittance would have been erroneous. The transmittances would have been too high (based on experimentation) so the absorbance rates would have been too low. This in turn would have caused the absorbance constant to be too low. If the absorbance constant was too low, the concentr...

An Introduction to Qualitative Analysis

...Secondly, we mix Ba(NO3)2 instead of HNO3 with the anions, and we observed that CO32- and SO42- forms a ppt. Then we add HNO3 to the ones that formed ppt, and the ppt disappeared. Next, we mix AgNO3 instead of Ba(NO3)2 with the anions, and observed ppt formed with all of the anions except for SO42-. After that, we added HNO3 and NH3 separately to the anions and we observed no change in SO42-, but the precipitates that formed in CO32-, Cl-, and I- disappeared. And there is a ppt formed when NH3 i...

Alchemy vs Chemistry

...This idea was known as transmutation, and the main goal of it is to transfer ordinary metal into gold. Aristotle did not have a proof for his theory However, because he was trusted and respected this idea has been for 2000 years even though they were wrong, and still until now there are some people who believe in alchemy and alchemists still exist. Some people think that chemistry and alchemy are the same, but they are different in many ways. First of all, alchemy rely a lot on the spiritual con...

Conductimetric Titration and Gravimetric Determination of a Precipitate

...Earlier in the experiment as the 0.1 M H2SO4 was being added the displayed graph showed a faulty result because the ionization data was collected too early before all the ions had been removed, thus there was a misleading result that the point of equivalent was reached. Later as more of the acid was added the true point of equivalence was found, which was 8.9 umho. If there was enough time then the experiment could be redone; in a more timely fashion. Could it be that the experiment was prearran...

Determination of the formula unit of a compound

...When zinc metal is reacted with hydrochloric acid, hydrogen gas is released and an aqueous solution of zinc chloride is produced. The zinc chloride solution when evaporated to dryness leaves a pure salt product. In order to calculate the simplest whole number ratio of chlorine to zinc or empirical formula for zinc chloride, we need to use the initial mass of zinc and the solid product formed. It is important that all of the zinc used be reacted and that large excess amounts of...

Back Titration

...Rinsing procedure was repeated.The graduated burette was filled with excess amount of 0.08M NaOH solution. Some solution was allowed to drain out through stopcock to a waste beaker.The burette was clamped securely to a retord stand.1-2 drops of methyl orange indicator was added to conical flask and it was swirled. The conical flask was placed under the burette.The initial burette reading was read and recorded.To begin titrating the excess HCl with NaOH, The stopcock was opened all the way and t...

Atoms, Molecules and Elements

...When two protons move toward each other they will repel away, as is true with two electrons. “The more energy an electron has, the farther from the nucleus it will be, thus electrons are arranged in shells at various distances from the nucleus according to how much energy they have” (Science Southwestern Advantage, 2011, p. 319). The charge of an atom works much like that of a magnet, if you try to put the two negative ends together they will push apart. Knowing the electronic structure of ...

Introduction to Chemical Engineering

...Getting acquainted is of most concern at this initial stage of team development. It usually includes polite dialogue of a superficial, information-sharing nature. Based on first impressions or past experiences, group members develop stereotypes in an attempt to categorize each other and anticipate future responses. Ideas are simple; emotions and feelings are kept in tight control, and controversy is avoided. There is an unspoken agreement not to disagree-a feeling that all members think and feel...

Role of Chemistry in Our Society

...It has played a major role in pharmaceutical advances, forensic science, and modern agriculture. The simple fact is that chemistry plays an important role in human’s life from the moment we’re born. It usually begins from the first thing each morning. Most people wake up to an alarm or radio. These common household items contain batteries, which make them very chemically dependent. These batteries contain positive and negative electrodes which is also all about chemistry. It also plays an im...

“Nanotechnology-implications and future”

...On the other hand , it raises many problems as any new technology including concerns about toxicity and environmental impact of nanomaterials ,and their effects on global economies . Nanorobotics center on self-sufficient machines which operate at nanoscale . There are hopes for applying nanorobotics in medicine ,yet it may not be easy to do such things because of drawbacks of such devices .Scientists on the moment have actually found that some of nanoparticles on which they are working can go t...

What organic molecule can be detected with Lugol’s?

...In this experiment, the glucose and starch molecules accurately reflected the expected results of the biological simulation. Animal’s starch molecule can’t cross the plasma membrane to leave the intestine, similarity in our experiment, the starch solution were not able to permeate through the intestine (Dialysis tubing), thus a no change of color occurred in the Lugol’s regent (I2Kl) solution. Furthermore, the glucose molecules can cross membrane between the intestine and circulatory syste...

Aristo Book 5 experiment answer

...1.Either Fe2+(aq) ions are Fe3+(aq) ions is a good choice of catalyst for this reaction because the interconversion between Fe2+ and Fe3+ facilitates the reaction between S2O82(aq) ions and I­­(aq) ions to occur. 2.The catalytic property of Fe2+(aq) ions may be due to the fact that it is easier for the negatively charged S2O82(aq) ions to approach the positively charged Fe2+(aq) ions. The same is true when the positively charged Fe3+(aq) ions formed can approach the negatively charged...

Simultaneous Determination of Several Thermodynamic Quantities

...Brown, T. et.al. (2012). Chemistry: The Central Science. 12th ed. United States of America: Pearson Education, Inc. Chaka, G. & Madhugiri S. (n.d.) Determination of Thermodynamic Quantities for a Chemical Reaction Chang, R. (2010). Chemistry. 10th ed. 1221 Avenue of the Americans, New York: McGraw- Hill Companies, Inc. Petrucci, Ralph H., et al. General Chemistry: Principles and Modern Applications. Upper Saddle River, NJ: Prentice Hall 2007. Weisstein, E. W. (2014). Roundoff Error. Retrieve...

Extended Experimental Investigation

...How to Make a Homemade Ice Pack, Livestrong.com http://www.livestrong.com/article/63981-make-homemade-ice-pack/ Hot water bottles, covers for hot water bottles and hot and cold packs requirements http://et.colesmyer.com.au/GMA/QCGM16_HotWaterBottles20060815.pdf Intelligent Ice http://www.iiwinners.com/intelligentice/index.htm Medical Ice Pack Ingredients, Livestrong.com http://www.livestrong.com/article/183659-medical-ice-pack-ingredients/ RICER, Elastoplast Sport http://www.elastoplastsport.com...

Beer's Law Lab

...2. A larger cuvette diameter will produce a higher absorbance value. The diameter of the cuvette is the path length, or b, in the equation A = a x b x c. The larger the path length, the higher the absorbance will be because you are multiplying a and c by a higher value. Also there is more particles present in a larger path length to absorb light. 3. To find the extinction coefficient the equation A/cb= a is used. A larger cuvette diameter, or path length, would result in a smaller extinction co...

Observation of Chemical changes

...Conclusion: This lab experiment forces an individual to think critically as to what macroscopic changes are occurring and why they are occurring. It taught us the difference between acids, bases, and neutrals, also if two specific chemicals are mixed together such as, potassium iodide and lead nitrate it will take on a precipitate form. I also learned how important ratios are in an experiment. If one chemical is greater than another, than a completely different reaction can occur than expected....

Scientific Investigation of the Peroxidase Enzyme & Temperature

...On pub Med I found something similar to the concept of our experiment. It stated, “The results showed that the D503F, D437H, and D503Y mutants had an optimum temperature of 55°C and a pH optimum of 4.5, similar to that of the wild-type enzyme. However, the half-lives of the mutants at 60°C were twice as long as that of the wild-type enzyme” (Pub Med). Here it shows at higher temperature this D503F mutants has a longer half life just like our test tubes have a faster reaction at higher t...

Star Apple (Chrysophyllum cainito) as an Antiseptic Mouthwash

...In research study of table salt, source from wikipedia.org Salt water chlorination is a process that uses dissolved salt (2,500–6,000 ppm) as a store for the chlorination system. The chlorine generator (also known as salt cell, salt generator, salt chlorinator) uses electrolysis in the presence of dissolved salt (NaCl) to produce hypochlorous acid (HCIO) and sodium hypochlorite (NaClO), which are the sanitizing agents already commonly used in swimming pools. As such, a saltwater pool is not ac...

Microscale Techniques

......

Extraction and Evaporation Recrystallization

...When a compound mixes with a different compound, the melting point of the mixture will be lower than the melting points of either of the pure compounds. Basing from the table, the melting point of pure benzoic acid is 121 C but when mixed to X, it went down to 89 C. Likewise with O-toluic acid and m-aminophenol. Since the melting point of mixture X with phenyl succinate has a melting point of 120 C, the melting point of pure X must be equal or closer to 121. Mixing X with phenyl succinate did no...

Determining the Mole Ratios in a Chemical Reaction

...The purpose of this lab was to determine the mole ratios of the reactants hypochlorite ion (OCI ) and thiosulfate (S O ) when reacted in a chemical reaction. A chemical equation gives the mole ratios of the reactants and products involved in the chemical reaction. When some formulas of the products are not known, experimental measurements can be made to determine those ratios. During this reaction, hypochlorite ions oxidize the thiosulfate ions according to the unbalanced and incomplete reaction...

Limiting Reactant

...Beran, J. A. Laboratory Manual for Principles of General Chemistry. 8th ed. Hoboken, NJ: John Wiley & Sons, Inc.; 2009 Beran, J. A. Laboratory Manual for Principles of General Chemistry. 9th ed. Hoboken, NJ: John Wiley; 2010 UC Davis ChemWiki. Stoichiometry and Balancing Reactions. http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Stoichiometry_and_Balancing_Reactions UCCS Chem 103 Laboratory Manual. Experiment 3 Limiting Reactants. http://www.uccs.edu/Documents/chemistry/n...

Determining of the equilibrium constant for the formation of FeSCN2+

...An acid and a base were mixed together throughout the experiment, which resulted in a bright orange color. It was determined that using the colorimeter at 565nm the would give the optimum wavelength because it was the closest absorbance to 430nm. All of the cuvettes were filled to 3mL so there would not be another dependent variable. Whenever Fe3+ would come in contact with SCN- there would be a color change. Relatively all of the Kc were close to each other as they should be because the only va...

DNA Extraction

...What else might be in the ethanol/aqueous interface How could you eliminate this When you precipitate the solution with cold ethanol 70 you would have a mix of DNA, RNA and some soluble salts. You should be able to centrifuge again so the DNA/RNA forms a pellet and drain the liquid out. Which DNA bases pair with each other How many hydrogen bonds are shared by each pair How is information to make proteins passed on through generations Watch the following Virtual Lab demonstrating DNA Extraction....

Diels-Alder reaction

...This reaction produced 7-oxabicyclo{2.2.1}hept-5-ene-2,3-dicarboxylic anhydride. Maleic anhydride was combined with diethyl either to dissolve the solid. Then furan was added and place under the hood for the next class period. During this time crystals were formed in the stopped flask. The melting point for the end product was observed at 113-114°C. This indicated that the product was exo. The percent yield was calculated at 5.98%. There were many sources of error that could have contributed to...

Chemical Equilibrium: Le Chatelier Principle

...The equilibrium state has a dynamic – that is, active – nature being characterized by the simultaneous and continuous formation of products from the reactants and reactants from the products2. But these simultaneous reactions do not necessarily follow that the concentrations of the reactants is equal to that of the product(s). Instead, the ratio of the concentrations of the reactants to the concentration of the product(s) raised to their coefficient in the balanced equation is Keq, a constan...

To investigate the effect to the potato cells in the different solute concentration water

......

Recrystallization Lab

...Recrystallization is a method used for cleansing solid organic substances. It is the most efficient approach to cleanse and remove impurities from a strong to allow a crystal to grow. The method is when the solute in a hot solvent yields to an option. Once the solvent cools, the service is saturated with regard to the solute, which is when it recrystallizes. A crystal is completion result of the method and it is a single pure substance with the impurities being omitted from it. The recrystalliza...


FAQ about Chemistry


❓ Why Should We Study Chemistry

...From what I understood the ingredients that make up the aspirin cause a reaction to reduce clotting factors. I was so intrigued to find all that out and I feel that I can see myself as a doctor. All things considered, like said I think you could agre ...

Are You on a Short Deadline? Let a Professional Writer Help You

Get Help
image

Your Answer is very helpful for Us
Thank you a lot!