Stoichiometry

for 30 min at room temperature. Then, trypsin/chymotrypsin- digested samples of KPNB1 obtained from the UV-crosslinking experiments with various concentrations of compound 1 were analyzed by nanoflow liquid chromatography and tandem mass spectrometry. The tandem mass spectra of the trypsin/chymotrypsin-digested KPNB1-compound 1 adducts showed 10 peptides coupled to compound 1 (Table S1, the Supplementary Information). Among these adducts, we found that the amounts of three of the products,…

observe the effect of concentration on the conductivity, by taking readings of the same solution at different concentrations. The charge of the ions also has an effect on the conductivity of the solution. Different charges result in different stoichiometry with different compounds. Take for example a 1.0 M solution of HCl. In this compound the two ions that make this up are: H+ and Cl-. So when these ions dissociate in a solution, the max ion concentration that the solution can reach is 2.0 M;…

day. The “sleep attack” as he called it could last for just few seconds to many minutes. Sarah was dumbfounded. She remembered it all started in chemistry class, her favorite class. She just finished question forty-five on the chemistry exam, a stoichiometry question, the next thing she remembered was her professor walking up to her to ask if she was well- she had fallen asleep. Sarah was disturbed. How could she sleep in chemistry class, especially during a test? Though she was bothered, she…

to cementitious materials ratio to 0.40. The optimal binder composition for strength and workability is found to contain 60% magnesium oxide and 40% silica fume (Mg/Si molar ratio equals 2.25) at which the proportions are not fully dependent on stoichiometry for formation of magnesium silicate hydrate gel but in line with high packing density mixtures to reduce…

In Chemistry 2017-2018 I learned many things that can help out in daily life to keep others safe and to improve things. One thing that can be useful is knowing basic chemicals and elements to be safe and know what is inside things you have in everyday life. Knowing chemicals is good to know not to mix certain things that can possibly be dangerous or hazardous to your-self or others. Knowing not to mix ammonia and bleach is good because when mixed causes an toxic gas that can harm you, others,…

observed in the spectrums from fig 5 relevant to the tin and sulfur. The EDX spectra show that the weight percentage for the film prepared at the precursor solution volume of 5 ml is 36.8% and 63.2%, which is approximately equal to their formal stoichiometry. The Atomic percentage of sulfur in SnS2 thin films increases with an increase in precursor solution volumes from 5 to 20 ml. The atomic percentage of tin and sulfur was observed in the precursor solution…

since the results were the same between the unknown and the known. For the four that did not react with the unknown, nor did they react with the hypothesized compound, validating the conclusion. For the reaction that formed the precipitate, using stoichiometry, the masses were equal between the unknown beginning, the hypothesized beginning, the unknown ending, and the hypothesized ending, once again confirming our…

Abstract A Friedal-Craft reaction was performed to synthesize 1,4-di-t-butyl-2,5-dimethoxy-benzene from p-dimethoxybenzene and t-butyl alcohol. The product of the reaction was filtered using a Hirsch funnel, before recrystallizing and filtering a second time. The recorded mass of the product was .08g and the melting point was 47-52.7 °C. Introduction1 This experiment was designed to practice working with electrophilic aromatic substitution reactions. Specifically, a Friedel-Craft reaction was…

V. The Cat’s Eye Nebula One of the most famous nebulae is the Cat’s Eye Nebula (NGC-6543); it was discovered by William Herschel in 1786. NGC-6543 is located in the northern constellation of Draco; it appears as a blooming center with surrounding and expanding rings. The NGC-6543 has a historical importance because it was the first nebula to be studied spectroscopically by the astronomer William Huggins in 1864; this study revealed the distinctions between PNe and the other gaseous nebulae.…

Concentration of Acetic Acid in Vinegar Nalebra Barnett, AAHCA, BSHA University of Central Oklahoma General Chemistry II Lab March 28, 2017 Dr. Lane Whitesell Lab 12. Concentration of Acetic Acid in Vinegar. This laboratory is to determine the concentration of acetic acid in vinegar using molarity and percent by mass of acetic acid in vinegar. This means, vinegar is a crucial solution of acetic acid (HC2H302) in water. Molarity (in mole/L), or mass percent expressed the…