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Chemistry Essay Examples

Determination of the Enthalpy for Decomposition of Hydrogen Peroxide

Determination of the Enthalpy for Decomposition of Hydrogen Peroxide Objective: To construct a coffee cup calorimeter, measure its calorimeter constant, and determine the enthalpy of decomposition and formation of hydrogen peroxide. Background: This experiment is a classic thermodynamics lab. In it, we attempt to measure the enthalpy (? H) of a chemical reaction. The main…

EDCI Assignment 3

Chapter 1 Chemistry 1201/1202 Give the chemical symbol or name for the following elements, as appropriate: (a) sulfur, (b) magnesium, (c) potassium, (d) chlorine, (e) copper, (f) F, (g) Ni, (h) Na, (i) Al, (j)Si Question 1.13 Make the following conversions: (a) 62 degree Farenheit to Celsius, (b) 216.7 degree Celsius (c) 233 degrees Celsius…

The environmental factors that effect turnip peroxidase

The changing of pH, substrate concentrations, temperature, and an inhibitor (Niacin) and the effects it hade on the enzyme turnip peroxides. Enzymes are biological catalysts which increase reaction rates by lowering the activation energies of substrates. A substrate is a reactant that interacts with the enzyme. The enzyme and substrate can be viewed as the…

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Ionic Reactions Lab

Ocean County College Department of Chemistry Chem 180 Lab 5: Ionic Reactions Submitted by Abstract: The purpose of this experiment is to work with aqueous solutions of ionic substances. Aqueous solutions are those solutions in which water is the solvent. When ionic substances are dissolved in water, the ions separate and become surrounded by water…

Advantage of Internet

1 Organic Chemistry 261(270, 271) Midterm-I Examination September 29, 2008 Name (print) ———————–ID No. ————————– Time: 50 minutes Total number of pages: 6 Answer all questions in the space provided. Question I. (15. 0) II. (14. 0) III. (14. 0) IV. (15. 0) V. (10. 0) Total (68. 0) Percentage Mark GOOD LUCK 2 (9….

Chemistry Lab Report- Exo and Endothermic Reactions

In endothermic reactions heat Vass absorbed. This avgas discerned by the temperature drop and the test tube became cool to touchy Reactions such as ‘Potassium Chloride crystals [s] Water were. Some vigorous reactions {reactions that occurred at a fast pace} were ‘Sodium Hydroxide [I] * Dilute hydrochloric acid [as]’, ‘Sodium Carbonate [s] + Ethanol Acid…

Redox Titration Lab Report

Cry H2O This equation can be used to convert moles of the dichloride ion to moles of the unknown iron to determine the percent of iron contained in the sample, To prepare the acid mixture add 125 ml of both concentrated phosphoric acid ND sulfuric acid to 500 ml of denizens water and mix well….

Liquid Phase Chemical Reactors

It is also used in the laboratories in obtaining design, interpretation of rate of reaction and numerical treatment of kinetics experimental data for different types of reacting systems. The use of a batch reactor for the most part eliminates the effects due to fluid flow on the resulting reaction rates. Consequently, the data reflect the…

Volumetric Analysis: Lab Report

At the equivalence point, all the KIP present has been neutralized by the added Noah and the solution is still colorless. However, if we add just one more drop of Noah solution from the burette, the solution will immediately turn pink because the solution is now basic. Titration of an unknown l. A measured amount…

Synthesis of Divanillin Lab Report

The dimmer bond forms between two carbons that have each lost an electron and have one to share, The dimmer bond does not involve an oxygen, so this is called oxidative demarcation because two identical compounds are bonded at oxidized carbons. 2) Draw resonance structures for the phenotype anion: 3) Why does the dimmer bond…

Factors Affecting Chemical Equilibrium

What Factors Affect Chemical Equilibrium? Introduction: In investigation 14, ‘What Factors Affect Chemical Equilibrium? “, the purpose was to find out which reagents caused a change in the chemical equilibrium. A deep red color was formed when Iron Nitrate (aqua)l was mixed with water and Ammonium Technocratic [NCSC (aqua)]. The product of these two reactants…

Lab Report on Ideal Gas Law

We then poured the water back into the test tube and placed the tube into the bucket with the opening upwards, turning the open end downwards after the tube was fully submerged beneath he surface. We then placed the canister directly below the opening of the test tube, and released the gas so that the…

Standardization Chemistry Lab Report

To be able to prepare standard solutions. To determine the strength of a given solution of Hydrochloric acid (HCI) To analyze errors that occur during standardization experiments. Introduction: A standard solution can be defined as a solution that contains a precisely known concentration of a substance. Concentration refers to the abundance of a substance in…

Lab Report: Gas Laws

Obtain a reference of pressures effects on gas using Bole’s law using a gas sample of standard “air” within a syringe and measuring pressures increase and decrease in association to changing volume. Measurements are obtained through microbial sensors and graphed using microbial software where a correlation coefficient of P vs… IN can be determined to…

Grignard Synthesis of Triphenylmethanol Lab Report

A Grinded reagent is a type of ergonomically, which consists of a bond twine a metal and a carbon. There are three types of carbon-metal bonds: ionic, polar covalent, and covalent. The ionic bonded compounds (example: RNa) have a weak bond between the carbon and the metal, and are therefore not useful because they are…

Chemical Bonding

Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms … a chemical bond. The two extreme cases of chemical bonds are: Covalent bond:…

Copper Iron Stoichiometry Lab Report

The two possible balanced reactions are – Cuscus (aqua) + Fee(s) Cue(s) + Feces (aqua) [I] cuscus (aqua) + fee(s) ICC(s) + [II] Through the possible reactions, one of the best way to determine which one is the correct reaction pertaining to the lab is limiting reagent analysis, where mass of copper is quantitatively determined…

Copper Cycle Lab Report

In conclusion my percent recovery of copper was 100% due to the adequate amounts of solutions and achievement of proper chemical reactions. Equipment and Materials: Copper Metal (penny) Nitric Acid (HON..)(aqua) Sodium Hydroxide (Noah)(aqua) sulfuric ACid Ammonium Hydroxide (NH)(aqua) Hydrochloric Acid (HCI)(aqua) Zinc powder 2 100 ml Beakers 250 ml Waste Beaker 400 ml Beaker…

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…

Lab Report Acid Base Titration

This allows for quantitative analysis of the concentration of an unknown acid or base solution. It makes use of the naturalization reaction that occurs between acids and bases and the knowledge of how acids and bases will react if their formulas are known. Acid-base titration can also be used to find percent purity of chemicals….

Density of Liquids Lab Report Paper

There are significant overlaps, however. The following are some observations about the numerical values of densities that should prove useful in problem solving situations. Solid densities: from about 0. 2 g/cam to 20 g/cam. Liquid densities: from about 0. 5 g/ml to 3-4 g/ml. Gas densities: mostly in the range of a few grams per…

Investigatory Project Homemade Bouncy Polymer

One might think that chemists are a bunch of boring scientists who wear lab coats and look at beakers all day, but did you know that many toys you play with are made using chemistry?Some of your favorite toys like Gak, Slime and Silly Putty started out as chemistry experiments. In fact, some of your…

Lab Report Determination of Boiling Point

The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Equipment / Materials: hot plate closed end capillary tube hermetic liquid organic compounds 250 ml beaker small test tube Safety: Always wear safety glasses in the lab. Capillary tubes break very easily, handle…

T Pentyl Chloride Lab Report

Edward Kluges, by a temperature of 79-ICC, the product is expected to boil (pig. 20). At about ICC, the product began to stabilize. This matches the expected boiling point for the product. After simple distillation and measurement, a total of 17 ml of the product was obtained. Side Reactions: Summary of experiment: The following experimental…

Lab Report Gas Diffusion

A lump of sugar added to a cup f black coffee eventually dissolves and then diffuses uniformly throughout the coffee. Perfume presents a pleasant fragrance which is imparted throughout the surrounding atmosphere. These are examples of mass transfer. Mass transfer plays a very important role in many industrial processes: the removal of pollutants from plant…

Fractional Distillation Organic Lab Report

If such ideal conditions are not possible as is usually the case”then simple distillation can be applied as long as he liquid in question is composed of compounds that differ in volatility such that their boiling points differ by at least 40 to 50 degrees Celsius. Because the very essence of simple distillation is relies…

Heterogeneous 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…

Lab Report Electrical Conductivity

When an ionic compound forms, the anion transfers an electron to the action which creates an electrostatic bond and an electrically neutral compound. Also, they readily solve in aqueous solutions and are good conductors of heat and electricity. Further, ionic compounds can be classified as either strong conductors or weak conductors. In contrast, molecular compounds…

Osmosis Potato Lab Report Biology

If the two solutions are of equal concentrations, they will be isotonic. If the concentrations are unequal, the solution with the higher concentration is hypersonic, and the solution with the lower concentration is hypotonic. What is the solute concentration of potatoes? We can determine this by conducting an experiment in which involves the process of…

Chemistry: Atom and Short Answer Questions

Part I Multiple choice or short answer questions 1) (2 points) Identify a solid a. Definite volume and no definite shape b. no definite volume and no definite shape c. definite volume and definite shape 2) (2 points) A substance composed of two or a. A solution. proportion is b. A heterogeneous mixture. c. An…

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