Due to its design, metallofullerenes are more stable than normal empty fullerenes up to very high temperatures and have uses in medicine. A metallofullerene with gadolinium is used as a contrast agent in magnetic resonance imaging scans and other metallofullerenes may be able to transport radioactive ions to cancerous tissue, providing a
In the early 1800s, John Dalton discovered that all matter is made of atoms, and that atoms are indivisible and indestructible. Atoms are one of the most essential concepts for scientists to understand, because they explain how chemicals and elements act and react. Atoms help show what elements do when put in different circumstances and why they do that. An atom’s structure is based on its number of shells or periods. Those are the orbitals surrounding the atom where the electrons are.
The relationship between them may be deduced from kinetic theory and is called the Ideal Gas Law. The Ideal Gas Law: PV=nRT=NkT n = number of moles R = universal gas constant = 8.3145 J/mol K N = number of molecules k = Boltzmann constant = 1.38066 x 10-23 J/K = 8.617385 x 10-5 eV/K k = R/NA NA =
N-arylsulfonyl tryptophanderivatives were investigated as ligands for the reaction due to “the high π-electron-donating characterof the indole ring” (?) B-n-butyloxazaborolidine was used at 5 mol% to accelerate and control the reaction of cyclopentadiene and 2-bromoacrolein (-78 °C) in DCM. Enantioselectivity of the desired 2R adduct occurred at ca. 200:1 with a high yield. This catalyst can be used to enantioselectively produce gibberellic acid, a plant hormone, as well as the antiulcer agent, cassiol and eunicenone.
1. For the demo experiment, the balanced chemical equation is as follows: (NH4)2Cr2O7(s)=Cr2O3(s)+N2(g)+4H2O(g). After the lightning of Ammonium dichromate, Chromium (III) oxide was formed while the Nitrogen and Water escaped into the atmosphere in a gaseous phase. Ammonium dichromate((NH4)2Cr2O7) gave rise to Chromium (III) oxide (Cr2O3), Nitrogen Gas(N2) and water (H2O) In terms of microscopic level, the ratio between reactants and products is as follows.
Particles are labeled in many ways. One way particles are referred to be as atoms (elements). They’re identified by their properties, number or protons and neutrons and atomic number. Another way particles are referred are as molecules (covalently bonded- nonmetal to nonmetal). For example, water is a molecule because it’s composed of nonmetals.
It also shows which elements will be grouped together by the similarity of their atomic structure. As shown the Periodic Law is well illustrated in Periodic Table in order for it to be used
Properties of Ionic and Covalent Substances Lab Report Introduction The purpose of this lab was to determine which of the following substances: wax, sugar, and salt, are an ionic compound and which are a covalent compound. In order to accurately digest the experiments results, definitions of each relating factor were researched, leading to the following information: ionic compounds are positive and negatively charged ions that experience attraction to each other and pull together in a cluster of ionic bonds; they are the strongest compound, are separated in high temperatures, and can be separated by polar water molecules. A covalent compound is formed when two or more nonmetal atoms share valence electrons; covalent compounds are also categorized into two sections: polar covalent and nonpolar covalent. Furthermore, polar covalent compounds dissolve in water, while nonpolar covalent compounds do not.
Bromine is an interesting color, it 's a color you wouldn 't expect it to be. Bromine is a reddish brown. The common compounds are oxides, sulfides, selenides, tellurides, nitrides, carbonyls, complexes. For bromine to form crystals it has to be a covalent radius. “This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of bromine.
In the book Brave New World by Aldous Huxley, the people of London in this future dystopian society take a pill called a soma that calms your nerves and helps your mind deal with stressful situations. Anytime they get worried at all or just feel down they take soma. (Huxley, 1998) Society should be against mood enhancing drugs because it alters their state of mind and effects the natural way of dealing with emotional situations. There are drugs that people take to alter their mood; some in a good way others may be bad.
The goal of this experiment was to isolate three different molecules (acidic, basic, and neutral) from a mixture and identify their molecular structure. This was accomplished by using acid/base liquid extraction and H NMR analysis. The neutral component of the unknown mixture #191 was fluorenone. This was evident due to an H NMR spectra that had a high presence of hydrogen signals in the 7.2- 7.7 ppm range. Chemical shift values for fluorenone stated in the lab manual were 7.27, 7.47, 7.48, and 7.6 (CITE), indicating that the corresponding H NMR spectra for the neutral unknown is of this chemical.
The purpose of this lab is to use the Diels-Alder reaction to combine anthracene and maleic anhydride. Named after its two founders the Diels-Alder reaction is the addition of a conjugated diene (electron rich compound) with a dienophile (electron poor compound). (1) These compounds will be combined using [4+2] cycloaddition, where the numbers 4 and 2 come from the number of π electrons that are used in each compound to synthesize the product. (2) This experiment comes at the cost of losing two π bonds to form two new sigma (σ) bonds in the cyclic compound. (2)