Knowledge in Polymer Chemistry
Dyes - Engineering Chemistry
These are the notes of the subject Chemistry for engineering and are targeted to one of the difficult subtopics of Dyes. These will prove beneficial to FY Engineering students of all branches and help them to score good marks in their exams.
VEDANT MILIND ATHAVALE
COMPOSITE MATERIALS
These are the notes of the subject CHEMISTRY for engineering and are targeted to one of the difficult subtopics of COMPOSITE. These will prove beneficial to both FY and SY Engineering students of all branches and help them to score good marks in their exams. Made by: A PROFESSOR/STUDENT AT VJTI
BEER LAMBERTS LAW
1 1. A solution of Tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm length cuvette. Given the absorbance coefficient of trp is 6.4 × 103 LMol-1cm-1 What is the concentration of a solution? Solution: As A = ε l c l= 0.5 cm A= 0.54 ε = 6.4 × 103 LMol-1cm-1 C=? So c = A/ε l = 0.54 / 6.4 × 103 × 0.5 Answer = 0.000168 M 2. Calculate the molar absorptivity of a 1 x 10-4 M solution, which has an absorbance of 0.20, when the path length is 2.5 cm. Solution: A = ε l c l= 2.5 cm A= 0.20 C= 1 x 10 – 4 M ε =? So ε = A / l c = 0.20/ 2.5 ×1 x 10-4 Answer = 800 dm3 /mol/cm. 2 3. The molar absorptivity of a 0.5 x 10-3 M solution is 261.53 dm3 /mol/cm, If it has an absorbance of 0.17, Calculate the path length. Solution: A = ε l c ε = 261.53 dm3 /mol/cm A= 0.17 C= 0.5 x 10-3 M l = ? So l = A / ε c = 0.17/ (261.53 × 0.5 x 10-3) Answer = 1.3 cm. 4. A 1.00 × 10–4 M solution of an analyte is placed in a sample cell with a path length of 1.00 cm. When measured at a wavelength of 350 nm, the solution’s absorbance is 0.139. What is the analyte’s molar absorptivity at this wavelength? l = 1.00 cm c = 1.00 × 10–4 M A=0.139 ε =? So A = ε l c ε = A / l c = 0.139/ 1.0 × 1.00 x 10-4 Answer = 1390 cm−1 M−1
SUPERCONDUCTIVITY BY DR PAUL
Superconductivity is the set of physical properties observed in certain materials, wherein electrical resistance vanishes and from which magnetic flux fields are expelled. Any material exhibiting these properties is a superconductor. Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered even down to near absolute zero, a superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero. An electric current through a loop of superconducting wire can persist indefinitely with no power source.
CO-ORDINATION COMPOUNDS
Metals only exist in solution as coordination complexes, it follows then that this class of compounds is useful in a wide variety of ways. In bioinorganic chemistry and bioorganometallic chemistry, coordination complexes serve either structural or catalytic functions. An estimated 30% of proteins contain metal ions. Examples include the intensely colored vitamin B12, the heme group in hemoglobin, the cytochromes, the chlorin group in chlorophyll, and carboxypeptidase, a hydrolytic enzyme important indigestion. Another complexion enzyme is catalase, which decomposes the cell's waste hydrogen peroxide. Homogeneous catalysis is a major application of coordination compounds for the production of organic substances. Processes include hydrogenation, hydroformylation, oxidation. In one example, a combination of titanium trichloride and triethylaluminium gives rise to Ziegler–Natta catalysts, used for the polymerization of ethylene and propylene to give polymers of great commercial importance as fibers, films, and plastics. Nickel, cobalt, and copper can be extracted using hydrometallurgical processes involving complexions. They are extracted from their ores as ammine complexes. Metals can also be separated using the selective precipitation and solubility of complexions. Cyanide is used chiefly for the extraction of gold and silver from their ores.
class 10 th all chemistry formula
Chemical formulas are important because they provide a concise way of describing the composition of a chemical compound. By using chemical formulas, chemists can quickly and accurately identify and communicate the composition of a substance. This is especially important in the laboratory, where chemists need to quickly and accurately identify the materials they are working with. Additionally, chemical formulas are used to describe the structure and reactivity of a compound, which is important for predicting the behavior of a substance and its reactivity with other compounds.
Rohit Lodhi
class 10 th chemical reaction
this pdf is consist all the important chemicl reaction wiyh example so please you can download. Alloying, or combining different metals, often produces a chemical reaction. This reaction can cause a change in the properties of the metals, such as increased strength or corrosion resistance. The reaction can also produce a new alloy. For example, when aluminum is alloyed with copper, the reaction forms a new alloy called aluminized copper.