Chemistry Essays, Research Papers & Term Papers (1,259) essays
Chemistry essays:
Polymerization of Composite Resins: Dental Chemistry
... hydroxyl groups near the benzene ring, this polymer is considered to have high viscosity. Since high viscosity will affect the rigid structure after polymerization, a compound, typically triethyleneglycol dimethacrylate, or TEGDMA, is added to reduce the viscosity. Another disadvantage of using ...
The Density Of An Unknown Liquid
... Liquid #100 ~ Disposable Test Tube ~ Graduated Cylinder ~ Paper Towels ~ Water ~ Scale ~ Pipet Observations : The substance sat on top of the water in the tube, which means that it has a greater density then water. When I touched the substance the texture seemed very oily. The viscosity ...
Organic Synthesis: Preparation & Analysis of Aspirin
... aspirin are both solids that melt at temperatures above 100˚ C Synthesis of aspirin We started this experiment preparing a warm water bath (around 85 degree C), and taking dry and heated 125 ml Erlenmeyer flask .Next step was placing 2 g of salicylic acid into flask, mixing with 5.0 ml ...
The aim of the experiment is to determine the percentage of aspirin in different commercial preparations (Aspirin & Magnyl) and to find out which is the best value for money.
... Aspirin is a monoprotic (monobasic) acid and therefore, reacts with sodium hydroxide solution according to the equation: CH3-COO-C6H4-COOH + NaOH à CH3-COO-C6H4-COONa + H2O : *Aspirin and Magnyl tablets. * NaOH *Phenolphthalein *95 % ethanol *Digital scale *Conical flask *Graduated cylinder ...
Cell Phones
... Play games Download songs (Brain, 1998-2002).? A cell phone is actually a sophisticated form of a radio. The cellular system divides a city into small cells. This allows extensive frequency reuse across the city so that many people can use their cell phones at the same time. Each cell ...
Enzyme Concentration
... used, from the moment the reactants are brought together until the reaction has stopped. Enzyme Concentration 3 Materials and Methods Enzyme Catalase was prepared using chicken liver, and put on ice so the enzyme would not denature. I poured 10-mL ...
New Derivatives Of Antimalarial Drug Artemisinin
... group (see scheme 1) Scheme 1 In the following experiments, and using a different methodology, it was tried to synthesise, with artemisin benzoate (5) and p-trifluoromethoxi phenol (6) as starting material, the trifluoromethoxi phenol substituted compound ...
Acid Rain and how to Scientifically Prevent it
... reacted with harmful compounds of mostly Nitrogen, Sulfur and Carbon. These compound emissions are emitted ... water liquidizes the gas so it turns into miniscule droplets. By creating these droplets the necessary surface area is made to support mass ... Wet scrubber is a tower that uses a fan to draw hot ...
Enthalpy Of Solution Lab Report Assessed on: * Data Collection and Processing (DCP) * Conclusion and Evaluation (CE)
... Sodium Hydroxide ( NaOH ) in had holes. And this increases the energy lost to the surroundings in the form of heat, which affects the temperature. � Processed Data Calculations Theory states: ΔH= -Q/n Q = m * c * ΔT � Where in this case m = mass of water, c ...
Preparation and Recrystallisation of Aspirin
... C=O) compound is used as an electrophile and is attacked by a nucleophilic alcohol (-OH) to form ester group (-COO). In this experiment, the hydroxyl group (-OH) on the benzene ring in salicylic acid reacts with carbonyl group in acetic anhydride to form an ester functional group ...