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Chemistry Essay Examples

Who Discovered Dry Ice

In 1835, the French chemist Charles Thilorier was the first man to discover dry ice. One day he opened a very large container of liquid carbon dioxide. The carbon dioxide would quickly evaporate, which left a solid dry ice in the bottom of the container. For the next 60 years, dry ice was observed in…

Parallax Error Chemistry

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…

Copper Ii Iodate

Introduction: Copper(II) iodate(V) ionizes weakly in water: Cu(IO3)2 + aq Cu2+(aq) + 2IO3-(aq) For a saturated solution of copper(II) iodate(V), concentration of IO3- ions doubles that of the Cu2+ (aq) ions, and Ksp of Cu(IO3)2(s) can be calculated by determining the concentration of Cu2+(aq) ion of a saturated Cu(IO3)2(aq). The e. m. f. of a…

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Why Should Each Sample Be Tightly Packed Into The Capillary Tube Prior To Heating

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…

Banana Oil Synthesis

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…

Chemistry Cheat Sheet

Procedure for Negatively Charged Ions (CHIC-) Use the same procedure as outlined above, then as a last step add one electron per negative charge to fill octets. Carbonate ion has a 2- charge, so we have two electrons available to fill octets. Using the procedure above, we arrive a this structure: The two singly-bonded oxygen…

Write The Balanced Equation For The Neutralization Reaction Between H3po4 And Naoh In An Aqueous Solution. Phases Are Optional.

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…

Sulfuric Acid Paper

Sulfuric acid is one of the most important industrial chemicals; more sulfuric acid is produced each year than is made of any other manufactured chemical. More than 40 million tons of it was produced in the United States in 1990 and was heavily manufactured in nearly every other country. It has widely varied uses and…

Flame Test Lab Report

Test Lab was an experiment designed to show how elements react when heated. This Lab attempted to prove that when electrons are excited and then calm, they emit a color specific to the element. This test showed that there is a direct coloration between the heat energy being expelled and the movement of electrons from…

Synthesis Of Dulcin

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…

Strontium Chloride Hexahydrate

The following are possible factors that may contribute to acheiving a higher yeild. Firstly, it is possible that there was contamination from outside sources, such as lint or dust particles that could have fallen into the drying precipitate. Secondly are impurities accumulated through water. Non-distilled water can contain many minerals and impurities , aswell as…

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…

Hydrogen Peroxide Paper Industry

The substances that I am going to use in this investigation are Manganese Dioxide and Hydrogen Peroxide. The Manganese Dioxide is a chemical catalyst and will be used to speed up the breaking down of Hydrogen Peroxide. I am using a chemical catalyst because it would give a more accurate result compared to organic or…

Specific Heat Capacity Ethanol

The three variables that affect the specific heat capacity of a substance are:  emperature change (K) or ( c) The equation that is used to determine the specific heat capacity of any substance is; Specific Heat Capacity = Energy Supplied ( Q) (C) Mass (kg) Temperature Change ( ) Unit: Jkg- K- Each different substance…

Density Of Water Experiment Lab Report

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…

Acid Base Titration Lab Report Discussion

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….

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…

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