Chemistry Essay Examples
Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by…
Oxygen in Liquids (DISSOLVED OXYGEN) Dissolved Oxygen – the amount of dissolved oxygen in a body of water as an indication of the degree of the health of water and its ability to support a balanced aquatic ecosystem. Oxygen – is a clear, colorless, odorless, and tasteless gas that dissolves in water. Small but important…
Purpose: The purpose of this experiment is to be able to conduct an aldol condensation reaction using an unknown aldehyde and an unknown ketone. H NMR is used to identify the unknown aldehyde and ketone. Melting point is used to identify the aldol condensation reaction. Theory: Condensation reaction is also known as a dehydration reaction….
What type of forces must be overcome when solid I2 dissolves in methanol, CH3OH? Induced dipole What type of forces must be disrupted between CH3OH molecules when I2 dissolves? Hydrogen bonding What type of forces exist between I2 and CH3OH molecules in solution? Dipole-Induced Dipole 4) What type of intermolecular forces must be overcome in…
1. Diffusion and Osmosis, June 4, 2013 2. Purpose: The purpose of this lab is to help give visual understanding of diffusion which is a solution of high concentration spontaneously (no energy required) moving to an area of low concentration. Also taking a look at osmosis, which is the movement of chemicals across the cell…
1.Determine the enthalpy change for NaOH (s) + HCl (aq) → NaCl (aq) + H2O (l) using Hess’s Law. a. Write the balanced chemical reaction and enthalpy change for Part I (1pt) b. Write the balanced chemical reaction and enthalpy change for Part II (1pt) c. Calculate the enthalpy change using Hess’s Law. Refer to…
INFORMATIVE SPEECH TOPICS The main questions for picking out good informative speech topics are: What are their wishes, tastes, interests and needs? What is their level of education and knowledge about the topic? Is their a common ground between you and your audience? Can you surprise them with new information? Can you excite their interest…
The study is entitled Combined solution of Garlic (Allium sativum) and Lemongrass (Cymbopogon citratus). Specifically, it sought to find out how these two solutions (lemongrass and garlic) can effectively kill mosquitoes. It aimed at looking for an organic and safe measure in treating the abundance of mosquito. Ideally, the researcher’s study promotes a tandem between…
Introduction: The purpose of this experiment is to determine the hardness of a sample of water (#89). Water hardness can be evaluated by an acid-base neutralization titration. (When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt.) From the Bronsted-Lowry acid-base reaction theory, the…
INTRODUCTION Common people may not have the actual knowledge of chemistry and it’s contribution. But they aware of the comforts which science has provided to the society. The modern technology, advances in medicines, fastest means of transport, durable and beautiful clothes, good fertilisers etc. are a few common things will which every one is familiar….
Chemical Reaction is a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. Reactant is a substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction. A word equation is an…
Lipids are molecules that are not soluble in water but can be dissolved in non-polar substances such as alcohol or chloroform (Mandal, n.d.). Lipid molecules are stored in adipose, or fat tissue, and can be broken down in our bodies to form an energy called ATP. To do so, the lipid molecule is dissected into…
Introduction You will be exploring three scenarios and conducting observations on the physical and chemical changes in matter. You will also investigate the input and output of energy during physical and chemical changes. Objective To demonstrate the differences between physical and chemical changes while observing the laws of conservation of matter and energy. Problem How…
Results Figure 1 shows that the response of the tissue increased with bath concentration of ACh (M). The logarithms of bath concentration for each response were used to form a clear sigmoidal formation, and thus depict a more clear relationship between concentration and response. Figure 1 shows the increasing rate of response as bath concentration…
I. INTRODUCTION The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution. It represents the level at which a solute dissolves in solution. A more a substance dissolves, the higher the Ksp value it has. In this experiment, a system of a sparingly soluble salt in water…
