Free essays on chemistry are educational resources that allow individuals to learn more about the science of chemistry at no cost. These essays cover a wide range of topics, from basic concepts in chemistry to more complex scientific theories and experiments. They provide insights into the chemical properties of various elements and compounds, the history of chemistry and its contributions to society, and the latest developments in this field. By reading these essays, students can deepen their understanding of chemistry and gain valuable knowledge that can help them in their academic and professional pursuits.
Describe The Chemical Composition And Configuration Of Enzymes
Herodotus once said, “Men are at the mercy of events and cannot control them. This means that people are vulnerable to future events that they have no control over. This quote is valid because people live their lives filled with uncertainty, so whatever happens in their life happens. You can only control how you deal with and react to the situation you are put into. One work of literature that strongly reflects the quote is the play ‘Macbeth” by William…...
Materials
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 extra happens. A metal has many free-moving electrons. These free-electrons can travel through the metal, transferring the energy more quickly. Convection: The transfer of energy,…...
EnergyEvaporation
Agar Diffusion Experiment
Having considered the phenomena of diffusion and osmosis I have been told to do a piece of coursework to investigate the rate of diffusion when using different concentrations of acid. I have been told to use Agar. Agar is extracted from sea weed and after dissolving in hot water it cools to form a ‘solid’ jelly although 99% of this is water. The agar is an inert medium that I am going to use to investigate the rate of diffusion.…...
ChemistryWater
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Movie Trailers: Showcasing Key Film Elements
Harry Potter and the philosophers stone and Spenserian 2 Film trailers are a synopsis of an up and coming movie, they represent and highlight key parts of a film to grasp the audience’s attention and entice them into viewing the movie. They are commonly seen on television during adverts and at any cinema. In order to analyses a film trailer successfully you have to focus on elements such as dramatic effects, suitability, target audience, music and lighting etc… I have…...
CameraColorHarry Potter
Greenhouse Effect Essay
Greenhouse Gas The greenhouse gas effect is the number one blame for global warming. We could not live without the greenhouse effect. The main gases are ozone, nitrous oxide, carbon dioxide, methane, and water vapor. These reflected rays, called infrared radiation , keeps the atmosphere warm. They are vital in maintaining the balance in our atmosphere. The greenhouse effect is mostly a result of the sunlight’s energy and the clouds that absorb and reflect heat. Without the greenhouse effect, earth…...
AtmosphereChemistryClimateClimate ChangeMaterialsNatural Environment
Gas Chromatography Lab Report Essays
Gas chromatography separates the component of a sample based on the ease with which they evaporate into a gas, also known as the volatility. The chemical mixture being analyzed is injected into the injection point and carried through the instrument by an inert gas, in this case Helium. The temperature of the injection point is approximately ICC and the oven temperature is around ICC. There is a column in the oven that makes it Seibel to separate the chemicals based…...
ChemistryChromatographyManufacturingMaterialsMechanical EngineeringScientific Method
Young Modulus For Copper
From the above results , we can see that there is a 12. 1 % random error in finding the Young modulus of copper . One of the reasons for such errors is the non-uniformity in cross sectional area . When a wire is stretched by a force , the length of course will increase , but at the same time the cross sectional area of the wire will also vary . This little variation will affect the calculation of…...
ExperimentReadingReason
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 our reference text slightly. We used 6. mL of our assigned butanol and only 4 mL of sulfuric acid. Going back to our reaction mechanisms,…...
Chemical ReactionChemistry
Milk And Food Coloring Report Example
For this experiment, we will be using milk and food coloring to represent the water (milk) and gas (food coloring) in the respiratory system, as seen in the liquid-gas boundary of the alveolar wall (water) and its volume (gas). We will place the milk in a shallow dish so that it completely covers the bottom of the dish. Drops of food coloring are going to be added into the milk at the center of the dish, and then observed. Drops…...
ChemistryMaterialsPhysicsWater
Compare And Contrast Football And Basketball
Football and basketball are the most commonly played sports in nowadays in America. In my opinion, I think that basketball is better than football, because of its environment, teamwork and physical contact. The first consideration of the differences will come from the way the games are played. While football is played outdoors where the lighting and temperatures are not controlled, basketball is mostly played indoors where the lighting and the temperatures are under control due to their artificial provision. The…...
BasketballContrastFootballLifeSports
An Insulated Piston-cylinder Device Contains 5l
Explain all your answers using the Problem-Solving Technique 1. A piston-cylinder device initially contains 0. 07 m3 of nitrogen at 130 kPa and 120oC. The nitrogen is now expanded polytropically to a state of 100 kPa and 100oC. Determine the boundary work during this process. 2. A piston-cylinder device with a set of stops initially contains 0. 3 kg of steam at 1. 0 MPa and 400oC. The location of the stops corresponds to 60 percent of the initial volume.…...
ChemistryMechanical EngineeringPhysicsThermodynamics
Experimenting with a Candle
Experimenting with a Candle Justin Nguyen Mrs. Howley 11/16/11 Mod F Purpose: the purpose is to learn how the process of a candle burning. The goals of this experiment are to practice in the art of observation, the art of questioning, and the development of a better understanding of this process. Hypothesis: through this experiment, we will learn how candle is working. Materials: * Candle * Note card * Matches or butane lighter * Aluminum foil * 1L beaker *…...
ChemistryExperimentFireHydrogenMaterials
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 called a residue. Procedure/Data: 1. Preheat a clean evaporating dish for 5 minutes; then cool and mass the dish. Mass of empty dish: 28. Egg…...
ChemistryChromatographyEvaporationManufacturingMaterialsWater
Enzyme Activity Prediction for Sucrose at 60°C
Enzyme Activity Name: Daniel Franco Instructor: Professor Jennifer Freer Date: 0308. 2015 Predictions Sucrose will have the greatest activity at 60 ?co (140 Sucrose activity decreases with increasing sucrose concentration Materials and Methods Effect of pH on Enzyme Activity Dependent Variable amount of product (glucose and fructose) produced Independent Variable pH Controlled Variables temperature. Amount of substrate (sucrose) present, sucrose 4 sucrose incubation time Effect of Temperature on Enzyme Activity temperature pH, amount of substrate (sucrose) present, sucrose + sucrose…...
ChemistryEnzymeGlucosePh
Stomata Lab Report
During those high-carbon-dioxide times, lands with fewer stomata will have an advantage and will be common. On the other hand, when carbon dioxide levels are low, plants need many stomata in order to scrape together enough carbon dioxide to survive. During low-carbon- dioxide times, plants with more stomata will have an advantage and will be common. (Understanding Evolution) Therefore, the question to be tested will be if you count the number of stomata of the same species of leaf at…...
Experiment
Beverage Density Lab
Drain the rinse solutions into an Erlenmeyer flask, k Don’t forget to rezone the balance prior to each new mass measurement. 7. Calculate the density and record the value in Data Table one Part B 8. Use the procedure in part A to determine the density of two beverages. Record all mass and volume data in Data table B and use clean glassware. Between successive beverage measurements rinse the pipette with the second beverage. V _ P re-Lab Questions 1.…...
DensityExperimentSugarWater
Contrast In Visual Arts
The following sample essay on Contrast In Visual Arts deals with forms of art. Drawing and photography are two similar yet different forms of art. Both compelling in their own respects, both unique in intricate ways. Yet sometimes controversial, even in everyday life. Two simple forms of art that are easily accessible. For example, every time a kid goes to a restaurant they give him or her a pack of crayons with a piece of paper to “draw”. I…...
CommunicationContrastCultureDrawingLifePhotography
Coke And Mentos Experiment
Diet Coke and Mentos: An Experimental Study Abstract This paper describes an experiment to determine whether the diet Mountain Dew contain Phosphoric Acid or not. This experiment was held at Green River Community College (GRCC) in Auburn, Washington on May 12. 2009 at 10:30 a. m. The temperature was 52 F. In this experiment, mentos caused a eruption in a 2-liter bottle of Diet Mountain Dew erupted, thus we concluded that diet Mountain Dew did have Phosphoric Acid because it…...
Coca-ColaCommunicationExperiment
Hnd Biomedical Science
The following sample essay on determination of the concentration of ethanol acid in commercial vinegar Introduction: The aim of the experiment was to determine the military of ethanol acid in table vinegar by titrating a sample with alkali sodium hydroxide (Noah) with a known concentration of 0. 1 moll-I. The equation of the reaction between ethanol acid and sodium hydroxide is as follows: CHOOSE + Noah Cinchona * H2O When the iterations end point is determined and volumes of reactants…...
ChemistryPhTitration
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) states that an acid is a compound that accepts a pair of electrons from a base and a base is a molecule or an ion…...
ChemistryMaterials
Potato Cylinder
Cut all these potato cylinders to same length using a scalpel-cut carefully away from my body. 7. I recorded the initial length of the potato cylinders on my result table. 8. Then I also measured the mass of each potato cylinder by placing In onto measuring scale and recorded the mass In the result table. 9. Afterwards the potato cylinder were placed into each test tube A. B, C, D. Leave it for 24 hours. Tubes I Initial Mass/g I…...
ChemistryOsmosisWater
Controlled Variables in Domino Experiments
Controlled Variable: The number of dominoes used (8 dominoes), the distance between the dominoes (2 CM), the loads used as the initial force applied on the amino (egg), the inclined plane used as a platform that will direct the load to hit the first domino (200), the stopwatch used to time the domino effect, the person using the stopwatch, the person releasing the metal weight from the top of the inclined plane, the ruler used to measure the distance between…...
EnergyExperimentForcePhysicsTime
Charlie Chaplin And Buster Keaton Compare And Contrast
Comparison/ Contrast of Chaplin and Keaton Charlie Chaplin and Buster Keaton are the founding actors for the comedian world. They both starred in numerous silent films in the early 1900s. They are commonly compared for their numerous similarities in their acting careers. Chaplin and Keaton are both comedians, they act in such a way to get the maximum laughs out of their audience. Comedic acting was much more difficult in silent films then it is now in regular films. In…...
Charlie ChaplinComedyCommunicationContrast
Thin Layer Chromatography Lab Report
Chromatography works on the principle that different impounds will have different solubility and adsorption to the two different phases between which are to be partitioned. Thin Layer Chromatography (TTL) is a solid-liquid technique. The mixture is observed when it is in two different phase; a solid (stationary phase) and a liquid (moving phase). Thin Layer Chromatography (TTL) is a technique which is sensitive, cheap and fast. A thin layer chromatograph plate is used to identify drug component under LIVE. It…...
ChemistryChromatographyManufacturingMaterials
In Contrast To Russia, The Communist Revolution In China
China and Russia had various similarities and differences during the early 20th century. They were different in the aspect of goals as Russia was highly concerned in making everyone literate to experience the works of Marx, Lenin and Stalin personally while neither the Chinese communist party nor the Kuomintang cared much about literacy for the masses. Another differences was the characterization of the Russian revolution by World war 1 leading to the revolt against a ruling Tsar while China, was…...
AsiaChinaCommunismContrastCountryLife
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 % C, 9. 7 % H and 51. 6 % O by mass. Its molar mass is 62. 1 g/mole. What is its molecular formula?…...
Chemical ReactionChemistryMaterialsSodiumWater
Compare And Contrast Posters
Both the film posters are effective in promoting the film and conveying meaning to the audience. They both use many effective visual devices to do this. The gesture codes are effective visual devices that are used to show facial expressions and body language. Film poster one presents us with a very strong opening image. That of a towering ferocious ape, King Kong. Kong is presented in a crouching pose, shielding the female protagonist from the audience. His protective state suggests…...
Body LanguageContrastKing KongLanguageWebsite
Was The Wave Experiment by Ben Ross Succesful
Ben Ross wants to show his students how Hitler could control Germany without people stopping him and also why people said that they didn’t know what happened during World War II. That is why he decides to make an experiment. I will explain how this experiment was successful. Hitler built a totalitarian movement from which he was the leader. First, it is important to know that Hitler was elected by German population and consequently he became the Head of Germany…...
Adolf HitlerConformityExperimentHuman NatureNazi Germany
Ap Bio Lab Report
Because segments interact with light, they are very useful to authoress. These pigments help the User gain energy. Because pigments only absorb a narrow range of light, many different color pigments are needed to capture more of the sun’s energy. There are three basic classes of pigments which are chlorophyll, carotenes, and physicians. There are several kinds of chlorophyll and they are greenish pigments. The most important one is chlorophyll A which is very important in making photosynthesis possible. Carotenes…...
BiologyChemistryPhotosynthesis
Diels Alder Lab Report
Be sure to address any questions posed in the lab procedure as well as any additional questions that your TA wants you to answer. You should also analyze any NORM spectra that you have from the reaction (if applicable). Spectra of starting materials are available on the Vista site. This reaction was carried out using standard reflux conditions. Both the anthracite and malefic anhydride dissolved immediately in Selene to give a slightly yellow solution. As the reflux was conducted, the…...
Chemical ReactionChemistryMaterials
What Macromolecule Is Baking Soda
Banana I N/A I No protein Oats I Nothing I No protein I Egg I Violet I ++ peptide bonds I Butter I Blue No protein I Analysis Questions: a. ) The dependent variable was the amount of approximate sugar, the relative amount of peptide bonds and the presence of lipid bonds. Also the independent variables that were measured were the resulting color of the Benedicts reagent, the Sudan IV and the color of the Beirut reagent. The relationship was…...
ChemistryNutritionSodium
Animal Experimentation Essay
Animal experimentation has been performed for centuries. The earliest recorded testing was by the Greeks in approximately 200BC; over 2000 years ago (lpag.org). This topic raises a lot of controversy on both sides of the argument. Scientists claim animal testing seems to bring a lot of benefits, yet, others believe it is harmful to the animals and that there are many other ways to perform these trials. This essay will provide information on the advantages and disadvantages of animal testing…...
Animal TestingExperimentMedicineResearch
Compare And Contrast Athens And Sparta
Ancient Greece was comprised of small city-states, of which Sparta and Athens were two. Athens was renowned as a center of wisdom and learning. The people of Athens were interested in arts, music, and intellectual pursuits. Sparta, on the other hand, was recognized for its military strength. A Spartan’s life was centered on the state, because he lived and died to serve the state. Although the competing city-states of Sparta and Athens were individually different as well as governmentally diverse,…...
Ancient GreeceContrastHistoryLifePoliticsSparta
Yeast Respiration Lab Report
The following sample essay on Yeast Respiration Lab Report. All organisms need to breath. They have pathways that are organic molecules and capture In their TAP. Some of these organisms need oxygen to do this but not all of them require It. Organic carbon molecules are the energy source, and for waste Is carbon doodle (CO) and water (H2O). CO can combine with water to form carbonic acid during cellular respiration. Phenolphthalein can be used to help detect any changes…...
Carbon DioxideCellular RespirationChemistryExperimentWater
Effect Of Air Conditioner On Global Warming
Air Conditioning and Global Warming Air conditioning systems use energy to remove heat from a given location, transferring it to the exterior in the form of exhaust. Some of the energy is invariably wasted as heat, and this additional heat must also be exhausted. Thus, air conditioning results in net heat release to the environment. The warming effect is aggravated, moreover, because higher forms of energy such as electricity are used to power air conditioners. Generating and transmitting this electricity…...
ChemistryEnergyGlobal WarmingHistoryMaterialsMechanical Engineering
Ap Chemistry Lab Report
After the experiment, the experimental mole ratio of alum to eater will be calculated and then compared with the accepted mole ratio. (This is 12 to 1). Theory If this lab if conducted properly, the unknown substance will be determined to be alum because of melting point, percent hydration and percent sulfate. The first test that will be run has the purpose of revealing the alum’s melting point. Melting is defined as, the temperature at which a solid turns into…...
Chemical ReactionChemistryEvaporationMaterialsWater
Cress Seed Germination Experiment
Aim: The aim of this coursework is to find out how varied amount of sulphur dioxide effect the germination of cress seeds.Safety: This experiment could be very dangerous because there are some chemicals, which are harmful for human body will be involved in this experiment. Such as sodium metabisulphite, it would damage your lungs and eyes when it mixed with gases. So, I will do the following things to prevent any accidents during the experiment.1, I will be following the…...
ChemistryExperimentSodiumWater
Propanone To Propane
Aim: The aim of this experiment is to prepare propanone by oxidizing propan-2-ol with acidified potassium dichromate solution. Introduction: Ketones and aldehydes are important series in preparation of other compounds and they are commonly prepared by oxidizing alcohol which is done in this experiment. The experiment is an oxidation reaction where a secondary alcohol (propan-2-ol) is oxidized by acidified potassium dichromate. The reaction does not need to be heated but should be placed in an iced water bath as the…...
AlcoholChemical ReactionChemistryMaterialsWater
E Coli Starch Hydrolysis
According to Table , Escherichia coli and Proteus vulgaris showed fermentative activity. However Proteus vulgaris only showed it for glucose, while E.coli showed it for all three of the carbohydrates. Pseudomonas aeruginosa showed no fermentation. In table 3, the only bacteria which showed a production of indole was Escherichia coli. This is because E. Coli has the enzyme tryptophanase that can degrade the amino acid tryptophan into indole, pyruvic acid and ammonia. (Madigan and Thomas, 2009)The idole produced by the…...
BacteriaBiologyChemistry
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 41 % . The merchandise was positively identified and characterized as 4-methylcyclohexene via IR and Br2 trial. Introduction Cyclohexene From Cyclohexanol Lab Report Conclusion To…...
Chemical ReactionChemistryMaterialsSodiumWater
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