Chemistry Essays Examples For College & High School Students in PDF

1489 total results

An Experiment to Understand the Process of Osmosis and Diffusion (1335 words, 5 pages)

There are two different ways that molecules, nutrients, and ions move across cell membranes. One of these ways is through diffusion. Diffusion is a process that occurs whenever dissolved particles move from an area of high concentration (more of them) to nearby areas where they are less concentrated (Weisshaar 2016). ... Read More

An Experiment on the Calculation of the Dissociation Constant for a Weak, Unknown Acid (1076 words, 8 pages)

IntroductionThe purpose of this experiment was to calculate the dissociation constant for a weak unknown acid when it was titrated with NaOH. In Bronsted-Lowry Theory, a weak acid is an acid that only partially dissociates into a conjugate base and hydronium ions 1. Weak acids are less likely to dissociate ... Read More

How Pill Bugs React to Different Substances (779 words, 5 pages)

Pill bugs are commonly found in damp environments like compost, piles of leaves or under logs. Pill bugs are nocturnal and dine mainly on rotting vegetation such as fallen leaves or wood. They are crustaceans of about 34 inch in length, but can spend their entire lives on land, unlike ... Read More

A Lab Experiment With Wintergreen Oil (844 words, 4 pages)

In this experiment, wintergreen oil (methyl salicylate) was refluxed with sodium hydroxide to produce a basic product that when added to sulfuric acid to result with salicylic acid in the form of a crude solid. This solid was filtered and recrystallized to end up with a purified version of salicylic ... Read More

A Lab Experiment Involving the Use of Heating and Crystalization Methods to Form Aspirin From Salicylic Acid, Acetic Anhydride and Sulfuric Acid (1108 words, 4 pages)

AbstractIn this experiment, heating and crystallization methods were used to form aspirin from salicylic acid, acetic anhydride and sulfuric acid. The final results were tested using 2.5 ferric chloride to test the outcome of the reaction. If the product turned purple by the ferric chloride, then the reaction failed. This ... Read More

A Lab Experiment on Understanding Electrodeposition and Corrosion (1442 words, 6 pages)

IntroductionLab two consisted of three different procedures in order for the students to gain a better understanding of electrodeposition and corrosion. The first part of the lab used the process of electroplating. The students created an electrochemical cell where zinc was electroplated onto steel. Although it may be slightly difficult ... Read More

A Research on Whether Starch, Sugar, Protein, and Fat Are Present in Chocolate Milk, Cheerios, Goldfish, and Cheez-Its (482 words, 2 pages)

Research Question Are starch, sugar, protein, and fat present in chocolate milk, cheerios, goldfish, and cheez-its? Starch, sugar, protein, and fat presence in various substancesObservations TableInterpretive ResultsChocolate milk changed color, becoming just slightly more pink after it was shaken, but the change was so barely noticeable that it was determined ... Read More

An Experiment Using Solubility Rules to Determine the Percent Composition of Limestone’s Calcium Carbonate (1580 words, 7 pages)

Limestone is a sedimentary rock composed of calcium carbonate (whose chief mineral component is calcite). This rock can also be formed by calcite precipitation dissolved in water, and other forms of limestone contain amounts of Mg, Mn, Fe, Ti, K, and few others substances. On February 04, 2016, the students ... Read More

An Experiment to Determine the Percent Composition of the Limestone in Calcium Through the Use of Knowledge of the Solubility Rules (1470 words, 8 pages)

PurposeThe purpose of this experiment is to use knowledge of the solubility rules and with precipitation reactions isolate Calcium from a real-world sample of limestone. The percent composition of the limestone in calcium will also be determined by using knowledge of mass relationships obtained in earlier experiments.ProcedureTo start this experiment, ... Read More

A Lab Experiment of the Induction of Protein Expression in a Prokaryote (809 words, 7 pages)

Experimental Lab 4 Induction of Protein Expression in a ProkaryoteIntroductionIn the previous experiment, we observed how different factors, including pH, temperature, time, and substrate concentration, could affect the rate of an enzymatic reaction. The purpose of this experiment is to observe how two different inducers compare in the expression of ... Read More

An Experiment to Recognize the Relationships Between Different Conditions That Affect the Rate of an Enzymatic Reaction (821 words, 9 pages)

The purpose of this experiment is to recognize the relationships between different conditions that effect the rate of an enzymatic reaction, including time, temperature, concentration, and pH. While conducting this lab, the student will accurately concoct molar solutions, use a spectrometer to measure absorbance, as well as create and use ... Read More

An Experiment to Determine a Numerical Value Using Titration Curve (415 words, 3 pages)

CHEM 201 EXPERIMENT 4TITRATION CURVESPROCEDURESee the pre-lab report on page 9 of my laboratory notebook for an outline of the general procedure.EXPERIMENTAL DATASee last page for titration curve graph.Equivalence point from first titration 15.42 mLEquivalence point from titration curve 15.65 mLCALCULATED RESULTSConcentration of unknown acid from first titration .06146MKa from ... Read More

An Experiment to Determine the Relation of Diffusion Rate to the Concentration of a Solution (897 words, 6 pages)

Experimental Lab 5 Diffusion and OsmosisIntroductionIn order for cells to maintain homeostasis, they must allow substances to move in and out of the cell. There are four different ways in which substances move across differentially permeable biological membranes, including simple diffusion, facilitated diffusion, active transport, and vesicular transport. The purpose ... Read More

An Experiment to Prepare and Calculate the Serial Dilutions (629 words, 4 pages)

Experimental Lab 2 Solutions, Optical Absorption, and Least Squares AnalysisIntroductionThe purpose of this experiment is to accurately prepare serial dilutions and calculate the concentrations of said dilutions, as well as determine the relationship between absorbance, found through the use of a spectrometer, and concentration of a solution. Specifically in this ... Read More

A Lab Experiment on the Identification of Cellular Division in Plant and Animal Cells (471 words, 6 pages)

Experimental Lab 8 Mitotic Cell DivisonIntroductionThe objective of this experiment is to familiarize the student with the recognizing and identifying different types of cellular division in plant and animal cells. All cellular division in in eukaryotes undergoes DNA replication, nuclear division, and cytokinesis. In mitosis, one haploid cell is converted ... Read More

A Lab Report on the Distribution of Heat and Dissolved Oxygen in Pontoosuc Lake and the Profile of Its Stratification (870 words, 2 pages)

Title Pontoosuc Lake and Lake StratificationAbstract The purpose of this lab was to examine the distribution of heat and dissolved oxygen throughout the water column from surface to bottom. We then will take this evidence and examine the profile for evidence of stratification or mixing. We also collected some aquatic ... Read More

A Lab on the Effect of Acid Deposition on Infrastructure and Water Sources in Terms of Ph Change (1858 words, 8 pages)

Acid Deposition InquiryBackground InformationIn recent years, acid deposition has received more and more attention as its harm to the environment becomes obvious. Acid deposition is defined as the accumulation of acids or acidic compounds on the surface of the Earth. It can occur in bodies of water, infrastructure, or plant ... Read More

An Experiment Analyzing the Effects of Concentration of Solutions in an Electrochemical Cell (2968 words, 12 pages)

Background InformationOxidation-reduction reactions, also known as redox reactions, are chemical reactions that involve electron transfers between two species. Oxidation means that the species lost electrons, and reduction means that the species gained electrons. Oxidation and reduction occur simultaneously. In addition, the substance being oxidized is also known as the reducing ... Read More

A Lab Experiment to Determine the Reactions That Result in Alkanes (2312 words, 10 pages)

IntroductionAlkanes have many functional uses in the modern world. They can be used to make plastics for example or even heat homes in the winter. Understanding the reactions that result in alkanes is a useful tool in organic chemistry. In this experiment the purpose was to determine how the size ... Read More

An Experiment to Determine the Reaction for a Specific Rate Law (1665 words, 6 pages)

Abstract The goal of this experiment was to find the rate law for the reaction 2H2O2 KI 2H2O O2(g), and to then determine the activation energy (Ea) and frequency factor (A). To do this, the experiment was split into two parts to be completed over two days. The first part ... Read More

An Experiment Determining the Concentration of Food Dye in Listerine Purple Mouthwash (1863 words, 9 pages)

Determining the Concentration of Food Dye in Listerine Purple MouthwashAbstractThe purpose of this experiment was to determine the types and concentrations of food dyes present in a given solution, in this case, purple Listerine mouthwash, and to then replicate the solution using food dye in the lab. To find the ... Read More

An Experiment to Determine the Reaction of Benedict’s Solution with Monosaccharides and Polysaccharides (391 words, 2 pages)

IntroductionBenedicts solution will react with monosaccharides, but not polysaccharides. However, iodine will react with polysaccharides and not monosaccharides. When a monosaccharide is exposed to Benedicts solution and placed in heat, the chemical reaction will take place and express a color change to red. When a polysaccharide is exposed to iodine, ... Read More

The Study of the Importance of Gamma-Aminobutyric Acid (849 words, 5 pages)

Gamma-aminobutyric acid (GABA) is a neurotransmitter every person has. It is found in the central nervous system (CNS) and helps inhibit neuronal signals. Without this crucial substance, the brain would be unstable. As discussed in class power points, without GABA one would experience severe reactions such as seizures and epilepsy. ... Read More

A Lab Experiment on Bomb Calorimetry (1210 words, 7 pages)

AbstractThe heat of combustion for both benzoic acid and sucrose is estimated in calorie per gram through the application of oxygen bomb calorimetry. Roughly a gram of each pure sample is combusted within the calorimeter and the heat of the reaction is measured through the temperature difference in the water ... Read More

A Lab on the Use of Indicators to Find the Ph Value of a Substance (1038 words, 4 pages)

The main goal of the pH Scale lab was to help us learn how to use indicators, specifically litmus paper, to find the pH of a substance. PH is the measure of how acidicbasic a substance is. This relates to what we are learning about in class as we are ... Read More

A Lab Report on the Use of Compound Light Microscope and the Impact of Its Parts on the Magnification of Objects (833 words, 3 pages)

The main goal of the Microscope Investigation Lab is to learn the different parts of a compound light microscope and how they work together to magnify objects. This lab connects to what we are learning about in class as we can use microscopes to magnify small objects that we normally ... Read More

The Different Components of a Firework (1287 words, 2 pages)

Fireworks are significant in celebrating holidays, but, what about fireworks do you not know? Fireworks are more than just pretty light shows in the sky. The flashes, booms, and shapes are all because of chemical reactions taking place. How fireworks are made is a delicate balance of different elements and ... Read More

The Characteristics and Importance of Gold, a Precious Metal (561 words, 3 pages)

Gold has always had value, always has been wanted. The precious metal has been sought for all of time. This metal found in a solid state and provides the connotation of royalty, wealth, and power. Those powers still ring true today even though it is much more accessible to people ... Read More

A Lab report: Determining the Effects of Salinity and Surface Area on Sinking Rate (1159 words, 7 pages)

The Effects of Salinity and Surface Area on Sinking RateIntroduction The purpose of this lab was to determine the effect of salinity onthe sinking rate for different objects. We ran these experiments todemonstrate how volume and surface area could also affect the sinking rate.This is important because plankton and other ... Read More

A Chemistry Lab Report: Recrystallization of an Unknown Soluble Compound (356 words, 1 pages)

Title of Experiment Recrystallization of an UnknownObjectives The purpose of this experiment is to determine the chemical identityof an Unknown soluble compound in the most accurate methods possible.However we will first have to separate it from two other solutes throughfiltration and recrystallization. The best method of classification isdetermination by melting ... Read More

Chemistry Essay Examples