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Chemistry Essay Examples

Lab Report: Separation and Purification of Organic

If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration. (rougher. Colorado. Due) A desirable solvent for crystallization has the…

Neutralization, Reaction between alkali and ammonium compound

Strength of Acid and Alkali, Reacting Masses, Volumetric AnalysisIn which of the following cases may it obtain a complete neutralization?(1)25.0 cm3 of 0.120 M sulphuric acid and 50cm3of 0.120M sodium hydroxide solution(2)50.cm3 of 0.5 M Sodium hydroxide and 0.025 moles of aqueous ammonium chloride(3)20.0cm3 of 0.100M phosphoric acid and 30.0cm3 of 0.200 M potassium hydroxide…

Chemistry Lab Report

Initial hypothesis: A 1 Ox eluted potassium dichloride solution have an expected spectrophotometer reading of 1. 000 while a xx diluted potassium dichloride solution have an expected spectrophotometer reading of 0. 200. The result we obtained correlates strongly to the hypothesis, albeit with a spectrophotometer reading error reaching as high as +0. 07 which is…

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Preparetion of salt

1. INSOLUBLE SALTSSoluble salt 1(aq) + soluble salt 2(aq) insoluble salt + soluble salt (aq)acid 1(aq) acid 2(aq)Pb(NO3)2(aq) + Na2SO4(g) PbSO4(s) + 2NaNO3(aq)Pb2+(aq) + SO2-4(aq) PbSO4To prepare a salt, you should firstly thoroughly mix the solution, then you should filter it to remove any precipitate. Next, you should, wash with distilled water and finally leave…

Melting Point Lab Report

I did three mixed melting point trials that resulted in a melting point of 1 ICC to 1 ICC. The melting point range is small, which indicates a relatively pure substance. I did a mixed melting point trial to find out what substance I had. I used Benzene Acid and Ecumenicist because they were the…

The Collision Theory

To help me explain the collision I am going to use information from “Chemistry Made Clear” by Gallagher and Ingram.In order for a reaction to occur the particles must meet and the collision must occur with enough energy. In the reaction I am investigating, the making of magnesium sulphate, the magnesium atoms and hydrogen ions…

Finding the concentration of sodium carbonate

Finding the concentration of sodium carbonate:Mass (Na2CO3 transferred to volumetric flask)= [mass (weighing bottle) + mass (Na2CO3)]-[mass(weighing bottle after emptying)]=15.24g – 12.59g=2.65gMolar mass (Na2CO3)Na=23C=12O=162Na x 1C x 3O = molar mass= (2 x 23) + 16 + (3 x 16)=106Number of mols (Na2CO3) = mass/molar mass=2.65g/106=0.025molNumber of mols (Na2CO3) = concentration x volume10000.025 mol. =…

Common Elements That Mess up Your Biochemistry Personal Statement

Biochemistry is a vast field that deals with the chemical processes that take place in a living organism, though it is not restricted to only living matter. Individuals who want to pursue biochemistry field are prepared to devote their life in studying different structures and functions of cellular components of living matters. To gain admission…

Chemistry- "Pennium" Lab Report

The relative abundance of the pre 1 982 pennies was 50 percent, and the relative abundance of the post 1982 pennies was 50 percent. The atomic mass of Pentium that was calculated using these isotopes was 2. 795 grams. A possible source of error could have been that the scales may have not given the…

Empirical Formula Lab Report

The molecular formula represents the number of all elements in a compound. The empirical is the simplest whole number ratio of the elements in that compound. Combustion reactions always involve oxygen and are almost always exothermic. Exothermic reactions give off energy in heat form. The purpose of this experiment is to find the empirical formula…

LDH Purification lab Report

OLD was purified from the ammonium sulfate precipitated protein mixture by affinity chromatography and its activity was studied by spectrophotometers determination of NADIA at 340 NM. From Pierce BCC assay of crude homogenate, initial protein concentration was shown to be 100 MGM/ml. The final protein concentration of the pooled affinity sample was shown to be…

Preparation of 1 - Bromobutane

The aim of the experiment is to produce 1 – Bromobutane, an alkane within the bromine group on the terminal group.Chemical SafetyChemicalHazardsSafety measuresSodium BromideNo hazardsNoneButan – 1 – olHarmful vapour, in liquid state chemical is harmful to skin, can be absorbed and cause internal damage. Flammable.Wear goggles and gloves.If spilled ventilate area and wash contact…

Lab Report for n-Butyl Bromide Preparation

Add drop of water to aqueous solution that you plan to discard. Make SUre water dissolves then discard. Add ml MM HOSTS to remaining solution and shake. Again, remove the aqueous layer on bottom and discard. Add ml of water to solution and shake. Organic layer on bottom, transfer bottom layer to clean ml vial….

Catalase lab report

However, once this optimal temperature has been passed, the enzyme becomes less effective. A good comparison for the impact of temperature would be running. There is an optimal temperature at which every runner runs. If it is too hot or too cold, the runner may not run as fast as they could if it were,…

Lab report for synthesis of polystyrene

Each monomer is incorporated into the polymer is known as a repeat unit or monomer residue. The physical properties of a polymer are strongly dependent on the size or length of the polymer chain. Some of the polymers and their precursors are via radical mechanism or necrophilia substitution. In this experiment, polystyrene, nylon 6, 10,…

Synthesis of Aspirin Lab Report

After the reaction was complete some unrelated acetic anhydride and salicylic acid was still be present in the solution as well as some sulfuric acid, aspirin, and acetic acid. Crystallization, which Uses the principle of solubility, was then used to remove most of the impurities and caused the ecstatically acid to precipitate out of the…

Formal lab report on ionic and covalent compounds

This experiment was divided in four steps to find the electrical conductivity of covalent and ionic solutions. There were four unknown solutes A, B and C. Each had a specific weight and was dissolved in a certain amount of solute to form either the covalent or ionic solution. Covalent compounds are made up of molecules…

Peroxidase Lab Report

We were able to measure enzymatic activity by the change in absorbency per second with a spectrophotometer. By testing different concentrations of peroxides and its reaction rate in seconds, we were able to see that as the amount of enzyme increased the catalytic reaction also increased. The optimal amount of peroxides concentration to be used…

Testing of the Melting Points of p-dichlorobenzene

Melting point temperature is a physical property of pure substances. It is an intensive property, which means the amount of material tested is irrelevant. This lab will determine the melting point temperatures of two known pure substances, naphthalene and p-dishonorable, using micro-sized quantities and a capillary melting tube apparatus. The percent error will then be…

Chemical and Physical Changes Lab Report

Because the glassware is glass, they may break and as such must be handled gently. All glassware should be inspected for cracks before starting the lab. Ill. Pre-Lab Questions- 1 . Identify the following as either chemical or physical changes: A. Striking a match- Chemical B. Food Spoiling- Chemical C. Breaking a Glass- Physical D….

Seperation of a Mixture Lab Report

In order to operate the iron from the mixture, take a bar magnet inside of a Copilot bag, and swirl it through the mixture. 5. The iron will stick to the magnet, and lift the magnet out of the mixture. All iron in the mixture should be on the magnet. 6. The iron taken out…

Salt And Sand Lab Report

Evaporation is a process where two liquids or solid mixed into a liquid can be separated. To separate two liquids mixed together, the liquid is boiled over a Bunsen burner until one liquid is completely evaporated. To separate a solid within a liquid, the liquid is completely evaporated and a solid will remain, which is…

Banana Oil Lab Report

Once all the needed chemicals were added we waited for about 70-minutes for the reaction to take place. The desired temperature for the reaction was ICC. We also had the solution at a constant stir. After the reaction was done taking place, we began to purification process. We used a pipette to remove the excess…

Lab Report APA Format

The purpose is also sometimes written as a separate section from the introduction. Theory (or Background pertaining to the experiment). This can include information from previous research, explanations of theories, methods or equations used, etc. ; for the example above, you might want to explain the theory behind acid/ base titration and a brief description…

The solubility of Potassium Nitrate lab report.

The relationship is nonlinear, which means it isn’t form a straight line when plotted on a graph. Now, there are three main factors, which affect solubility (besides pressure). Temperature will affect solubility. If the solution process absorbs energy then the solubility will be increased as the temperature is increased. If the solution process releases energy…

The Wittig Reaction - Lab Report

Witting discovered the route to alikeness through yield molecules (1). Witting was educated originally at Tubing; Witting spent periods at Brainwashing, Prefigure, back to Tubing again before taking up the post as director of the organic chemistry department at Heidelberg (1 Witting became an emeritus professor in 1967, where he remained until the end of…

Lab Report: Flame Test

Hydrochloric Acid into the 50 ml beaker. 3. Clean the Monochrome wire before each test. To do this, rinse it with distilled water from the wash bottle, dip it into the Hydrochloric Acid, and place it in the burner flame for a few moments. 4. Take note of the color of the flame when the…

Formal Lab Report Rates of Reaction Alkali Metals

Then, the test tube was lifted out of the water and kept in an inverted position. Finally, the gas collected was tested by bringing a burning splint to the mouth of the test tube. It was concluded that the Alkali metals were more reactive than the Alkaline Earth metals. When the active metals reacted with…

Tonicity on cell membrane lab report

Unknown solution C showed no change to the RUB shape, it was suggested that unknown solution C was isotonic. To confirm the tonality of unknown solutions A, B and C, a potato strip was placed in 3 separate tubes containing each unknown solution. After each potato strip soaked for twenty minutes it was proven; unknown…

Lab Report Final Draft

The student conducted the experiment given, using safe lab practices, that found the polarity of two separate solvents, and it has been shown through experimental exults that the hypothesis formed in the beginning of this experiment is true. It has been deducted from this experiment that solvents which dissolve, or pick-up, water soluble inks are…

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