reactive hydroxyl groups. There are as many as 10‚000 glucose monomers per molecule. The molecular chains are arranged in long spiral linear chains within the fiber. The strength of a fiber is directly related to chain length. Hydrogen bonding occurs between cellulose chains in a cotton fiber. Hydrogen bonding occurs when hydroxyl groups within the chain are polar‚ meaning the electrons surrounding the atoms are not evenly distributed. As a consequence‚ hydrogen atoms of the hydroxyl group are
Premium Cotton
Chapter 1 INTRODUCTION 1.1 Background of study Macrobrachium rosernbergii‚ also known as the giant river prawn is much known as a species in the Southern and Southeastern Asia‚ Western Pacific Island and Northern Oceania. This species lives inland of the freshwater areas during adult stage while the larvae needs brackish water and usually found in estuaries (Galitzine and Morgan‚ 2009). This species of prawn is a tropical living animal which needs warmer temperatures more than 18°C for growth
Premium
8. Terfenedine is an amino diol that is the active ingredient in the antihistamine Seldane. Mass spectral analysis of terfenedine shows a molecular ion at m/z = 471 and a peak at m/z = 472 which is 35.5% the height of the molecular ion. Terfenedine is known to contain C‚ H‚ O and N. (a) Suggest five molecular formulas for terfenedine. (b) Terfenedine has an even number of carbons and contains nine double bonds and four rings. Based on this additional information‚ what is the formula for terfenedine
Premium Nuclear magnetic resonance Spectroscopy Chemistry
pH is manipulated of the solution. PNP is also an acid/ base indicator. The compounded starts off as internal conjugated ring with the hydroxyl group and the nitro group single bonded to the aromatic ring. This occurs at the pH of 5. At this point the aromatic compound is colorless and is in the ultraviolet range. However‚ as the pH begins to increase the hydroxyl group deprotonates‚ leaving the oxygen with a negative 1 charge. The molecule compensates for the negative charge by conforming to a more
Free PH Acid dissociation constant Protein
Ethanolamine and mono ethanolamine is the name given to the chemical compound 2-aminaethanol which is usually abbreviated as ETA or MEA. In Chemistry they are said to have both a primary amine due to an amino group and a primary alcohol due to the hydroxyl group in its molecule. Similar to other amines‚ mono ethanolamine acts as a weak base. It has hazardous properties such as being toxic‚ flammable‚ and corrosive. It is a colorless‚ viscous liquid with an odor similar to that of ammonia. Ethanolamine
Premium
= 2.81 3. How are the retention times for caffeine and benzoic acid related to their chemical structure and the nature of the chromatographic system? The retention time of caffeine and benzoic are related due to the presence of a hydroxyl group. The hydroxyl group impart polarity and induce dipole-dipole forces between the benzoic acid and the column. Thus‚ benzoic acid‚ being polar‚ are retarded by the column and will come out of the column with a longer retention time. 4. What is the
Premium Chromatography Linear regression Analytical chemistry
Grignard reagents and are useful in making carbon-carbon bonds and reducing carbonyls. Grignard reagents are any of the numerous organic derivatives of magnesium (Mg)‚ commonly represented by the general formula RMgX (in which R is a hydrocarbon radical: CH3‚ C2H5‚ C6H5‚ etc.; and X is a halogen atom‚ usually chlorine‚ bromine‚ or iodine). They are called Grignard reagents after their discoverer‚ French chemist Victor Grignard‚ who was a corecipient of the 1912 Nobel Prize for Chemistry for this
Premium Magnesium Oxygen Solvent
Tema 16. Coronary Circulation Comisión Papanicolaou Unit 16. Coronary Circulation 1. Morfofunctional
Premium Heart Artery
state‚ glucose has a linear structure‚ but when dissolved in water‚ the molecules fold on itself to form one of the two possible ring structures: α-glucose (alpha) β-glucose(beta) two isomers of glucose differ only in the orientation of a single hydroxyl (-OH) group small structural differences lead to large differences in chemical properties starch found in mushrooms (amylopectin) is a polymer of α-glucose – can easily be digested STARCH = DIGESTIBLE Cellulose found in celery is a polymer
Premium Carbohydrate Glucose Disaccharide
Compare and contrast acids and bases in terms of their H+ ion and OH-ion concentrations. When an acid is dissolved in water‚ there are more hydrogen ions(H+) present than hydroxyl ions(OH-) due to the fact that acids donate hydrogen ions. An alkaline or basic solution accepts hydrogen ions. As a result‚ it has more hydroxyl ions in solution. Using the pH scale‚ pure water is neutral with a pH of 7. Acids range from 1-6‚ with the strongest acid having a pH of 1. Alkaline substances range from 8-14
Premium PH Acid Hydrochloric acid