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Chemistry Essay Examples

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…

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…

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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…

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…

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…

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…

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…

Enzyme lab report

Enzymes are catalysts which are chemical substances that reduce the amount of activation energy needed for the reaction to begin. All enzymes are all proteins or RNA molecules that speed up metabolic reactions and help to break down poisonous chemicals in the organism’s body. An enzyme will only react if the enzyme fits well with…

Titration Analysis of Aspirin Tablets

Chemistry 12 12/Oct/2011 Titration- Analysis of Aspirin Tablets Objective: Determine the percentage of aspirin (acetylsalicylic acid) present in two different commercial tablets by titrating the solution with a base. Also determine whether the aspirin is a strong or weak acid according to the Bronsted- Lowry and Lewis theories and deduce the formula of the acid-…

Preparation Of Salts

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…

Acids Bases And Buffers

To measure the buffering capacity of two types of Isotonic drinks. Introduction: There are acid-forming. Basic forming and neutral food, however the acid or alkaline properties of a food is unable to judge by the actual acidity of the food itself. For example, citrus fruits such as lemon are acidic, but they are alkaline-forming when…

Culminating Task

“Chemistry; the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.” Introduction Generally, chemistry is the study of substances, compounds, and the ways…

Condensation Examples In Daily Life

“The purpose of teachers’ questions should be to promote children’s activity and reasoning” (up 41 ) which Is why It Is up to the teachers of today to establish an understanding of the different sorts of questions that can be used to get different sorts of responses from the children that would Initiate participation In…

Is Skim Milk A Homogeneous Mixture

A heterogeneous mixture that would be Solid/Liquid would be Skim milk. Although skim milk contains mostly water it also contains casein, which is a small protein. The casein protein is so small it may not be thought to be a heterogeneous mixture, but fifth skim milk curdles the mixture can be separated. A Solid/Liquid solution…

4-methylcyclohexene

Abstraction 4-methylcyclohexanol was synthesized to 4-methylcyclohexene utilizing desiccation. 4-methylcyclohexanol was heated to reflux and the subsequent distillation ( 4-methylcyclohexe ) was collected. It was so purified utilizing Na chloride to divide merchandises and an anhydrous solid was so added and filtered. The resulting merchandise had a mass of 0.399 g and a percent output of…

Eutectic Temperature Of Naphthalene Biphenyl System

Abstract Thermal analysis of a solid-liquid phase using cooling curves at various compositions is a method used to obtain the eutectic composition and temperature of naphthalene-biphenyl. The XE was 0. 45 and the TE was 310. 3K these are slightly different from the theoretical values which are 0. 44 and 312K respectively. Results The cooling…

Molar Mass Of Ni3(Po4)2

Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10. 0 grams of Fe. 2. Give the mass number, #protons, #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50. 0 g of benzene C6H6 4. A substance is found to be 38. 7…

Sulphuric Acid Is Dibasic

Demonstrating that sulphuric is dibasic: Aim: The aim of my plan is to demonstrate that sulphuric acid is dibasic. Introduction: Acid is a substance that reacts with a base to form a salt and water similarly a base is a substance that reacts with an acid to form a salt and water. “Lewis (a scientist)…

Clara Lim-sylianco

Dr. Clara Lim-Sylianco is a Filipino scientist known on her works on mutagens, anti-mutagens, and Carcinogenic chemicals found in various fruits and vegetables. She also authored schoolbooks that are still makes use in schools nowadays. She received the Gregorio Y. Zara award in 1979; she also served as the UP Endowment Professorial Chair in chemistry…

Salt And Sand Separation 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…

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. =…

Hydrobromic Acid With Magnesium

For this experiment our primary goal was to observe and note the reaction of butanols with hydrobromic acid. Before the lab began we discussed and proposed mechanisms. (see “Mechanisms”) To begin this experiment we calculated how much of each material we were going to be using, and the numbers we chose to use differed from…

Cooling Rates Of Liquids

Heat energy is conducted from the hot end to the cold end. It is transferred from atom to atom. At the hot end the atoms are vibrating a lot. The vibration is gradually passed along to the other atoms as they collide into each other. This happens in all substances, but in a metal something…

Distillation Lab Report

If the boiling points are too close, this method will not work because the two compounds will begin evaporating at close temperatures and will condense down to the receiving flasks at relatively the same times. This will not create an ideal separation. The apparatus used for this type of distillation is longer than that of…

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