KCET – CHEMISTRY – 2016 - Medicine.careers360.com
... 16. Benezene carbaldehyde is reacted with concentrated NaOH solution to give the products A and B. The product A can be used food preservative and the product B is an aromatic hydroxyl compound where OH group is linked to sp3 hydridised carbon atom next to Benzene ring. The products A and B respect ...
... 16. Benezene carbaldehyde is reacted with concentrated NaOH solution to give the products A and B. The product A can be used food preservative and the product B is an aromatic hydroxyl compound where OH group is linked to sp3 hydridised carbon atom next to Benzene ring. The products A and B respect ...
HOTS Worksheet
... Ans. Fibres have strong intermolecular forces of attraction which leads to close packing of their chains and impart crystalline structure. Q. 3. Which artificial polymer is present in bubble gum or chewing gum ? Ans. Bubble gum or chewing gum contains synthetic Styrene-butadiene rubber. Q. 4. Name t ...
... Ans. Fibres have strong intermolecular forces of attraction which leads to close packing of their chains and impart crystalline structure. Q. 3. Which artificial polymer is present in bubble gum or chewing gum ? Ans. Bubble gum or chewing gum contains synthetic Styrene-butadiene rubber. Q. 4. Name t ...
Vinnitsa National Pirogov Memorial Medical University Biological
... 1.Write the electronic structure of potassium atom and ion. 2. Write the electronic structure of aluminium atom and Al3+ ion. 3.Write the equations of the below given chain. ...
... 1.Write the electronic structure of potassium atom and ion. 2. Write the electronic structure of aluminium atom and Al3+ ion. 3.Write the equations of the below given chain. ...
Topic 7.2 Equilibrium The Position of Equilibrium
... The effect of a catalyst on equilibrium Adding a catalyst speeds up a reaction by providing an alternative mechanism with a lower activation energy, thus speeding up both the forward and backward reaction rate. It shortens the time needed to attain equilibrium concentrations It has no effect ...
... The effect of a catalyst on equilibrium Adding a catalyst speeds up a reaction by providing an alternative mechanism with a lower activation energy, thus speeding up both the forward and backward reaction rate. It shortens the time needed to attain equilibrium concentrations It has no effect ...
The d-Block Elements
... Manganese, for example, forms compounds in every oxidation state between −3 and +7. Because of the slow but steady increase in ionization potentials across a row, high oxidation states become progressively less stable for the elements on the right side of the d block. The occurrence of multiple oxid ...
... Manganese, for example, forms compounds in every oxidation state between −3 and +7. Because of the slow but steady increase in ionization potentials across a row, high oxidation states become progressively less stable for the elements on the right side of the d block. The occurrence of multiple oxid ...
Efficient Phosphodiester Hydrolysis by
... to the cooperative effect of the hydroxide groups of the ligand acting as general bases. The lanthanide systems show greater ability to form dimers and aggregates in solution, hindering these studies, especially in terms of defining the active catalytic species in the medium. However, through lumine ...
... to the cooperative effect of the hydroxide groups of the ligand acting as general bases. The lanthanide systems show greater ability to form dimers and aggregates in solution, hindering these studies, especially in terms of defining the active catalytic species in the medium. However, through lumine ...
Thermochemistry Diploma Questions
... ____ 44. If solid glucose is completely burned in the flame of a Bunsen burner, the enthalpy change is a. greater than it is during cellular repiration because the production of H2O(g) releases more energy than does the production of H2O(l) b. less than it is during cellular repiration because the p ...
... ____ 44. If solid glucose is completely burned in the flame of a Bunsen burner, the enthalpy change is a. greater than it is during cellular repiration because the production of H2O(g) releases more energy than does the production of H2O(l) b. less than it is during cellular repiration because the p ...
13 CHEMICAL EQUILIBRIUM W MODULE - 5
... reaction, it is believed that all the reactants would be converted into products with the release or absorption of energy. This is not true in all cases. Many chemical reactions proceed only to a certain extent and stop. When analysed, the resulting mixture contains both the reactants and products. ...
... reaction, it is believed that all the reactants would be converted into products with the release or absorption of energy. This is not true in all cases. Many chemical reactions proceed only to a certain extent and stop. When analysed, the resulting mixture contains both the reactants and products. ...
Equilibrium Reversible Reactions
... link arms on the left side of the room to represent sodium chloride particles. Have the remaining 12 students stand on the right side of the room. Ask a student to record on the board the number of each type of particles. At this point, explain that in order for sodium chloride to break apart, heat ...
... link arms on the left side of the room to represent sodium chloride particles. Have the remaining 12 students stand on the right side of the room. Ask a student to record on the board the number of each type of particles. At this point, explain that in order for sodium chloride to break apart, heat ...
Fritz-Haber-Institut der Max-Planck
... Fe containing surface is thus Fe3O4 which has low catalytic activity. We state that Fe is necessary but should not be in the top layer because it binds both EB and St too strongly. In connection with the study of catalytic activity, K-promoted films with a wide range of K-contents were prepared. Res ...
... Fe containing surface is thus Fe3O4 which has low catalytic activity. We state that Fe is necessary but should not be in the top layer because it binds both EB and St too strongly. In connection with the study of catalytic activity, K-promoted films with a wide range of K-contents were prepared. Res ...
Chemical Vapor Deposition (CVD)
... 1960: Introduction of the terms CVD and PVD to distinguish “chemical vapour deposition” from “physical vapour deposition.” 1960: Introduction of CVD in semiconductor fabrication. 1960: CVD TiC coating on cemented carbide tools introduced and development of CVD tungsten. 1963: Introduction of ...
... 1960: Introduction of the terms CVD and PVD to distinguish “chemical vapour deposition” from “physical vapour deposition.” 1960: Introduction of CVD in semiconductor fabrication. 1960: CVD TiC coating on cemented carbide tools introduced and development of CVD tungsten. 1963: Introduction of ...
2016-2018 Syllabus - Cambridge International Examinations
... final result.’ Page 39: Section C5.3.4 Suggesting improvements, paragraph after list, 6th line, now reads ‘may relate to sources of error or uncertainty identified by the candidate or to other sources of error or uncertainty.’ The changes below were introduced for version 1 of this syllabus. Part of ...
... final result.’ Page 39: Section C5.3.4 Suggesting improvements, paragraph after list, 6th line, now reads ‘may relate to sources of error or uncertainty identified by the candidate or to other sources of error or uncertainty.’ The changes below were introduced for version 1 of this syllabus. Part of ...
Mole Concept - Shailendra Kumar Chemistry
... One of the earliest method for determining the molecular weight of protein was based on chemical analysis. A haemoglobin preparation was found to contain 0.335% iron. (a) If the haemoglobin molecule contain one atom of iron. What is its molecular weight ? (b) If the haemoglobin molecule contains fou ...
... One of the earliest method for determining the molecular weight of protein was based on chemical analysis. A haemoglobin preparation was found to contain 0.335% iron. (a) If the haemoglobin molecule contain one atom of iron. What is its molecular weight ? (b) If the haemoglobin molecule contains fou ...
1 1. (8 pts) Circle the formula (only one) that best fits each of the
... (2 pts) Aspartame, the artificial sweetener marketed under the name NutraSweet, is a methyl ester of a dipeptide. Circle the asymmetric carbon atoms (chiral centers) in the structure of aspartame shown. O ...
... (2 pts) Aspartame, the artificial sweetener marketed under the name NutraSweet, is a methyl ester of a dipeptide. Circle the asymmetric carbon atoms (chiral centers) in the structure of aspartame shown. O ...
STUDY MATERIAL 2015-16 CHEMISTRY CLASS XI
... such as minerals. For example, common salt, marble and limestone. Organic compounds are those, which occur in living sources such as plants and animals. They all contain carbon. Common organic compounds are oils, wax, fats etc. Mixtures A mixture is a combination of two or more elements or compounds ...
... such as minerals. For example, common salt, marble and limestone. Organic compounds are those, which occur in living sources such as plants and animals. They all contain carbon. Common organic compounds are oils, wax, fats etc. Mixtures A mixture is a combination of two or more elements or compounds ...
Chemical Reactions - 2012 Book Archive
... Chapter 2 "Molecules, Ions, and Chemical Formulas" introduced you to a wide variety of chemical compounds, many of which have interesting applications. For example, nitrous oxide, a mild anesthetic, is also used as the propellant in cans of whipped cream, while copper(I) oxide is used as both a red ...
... Chapter 2 "Molecules, Ions, and Chemical Formulas" introduced you to a wide variety of chemical compounds, many of which have interesting applications. For example, nitrous oxide, a mild anesthetic, is also used as the propellant in cans of whipped cream, while copper(I) oxide is used as both a red ...
support material
... Kendriya Vidyalaya Sangathan is a pioneer organization which caters to the all round development of the students. Time to time various strategies have been adopted to adorn the students with academic excellence. This support material is one such effort by Kendriya Vidyalaya Sangathan, an empirical e ...
... Kendriya Vidyalaya Sangathan is a pioneer organization which caters to the all round development of the students. Time to time various strategies have been adopted to adorn the students with academic excellence. This support material is one such effort by Kendriya Vidyalaya Sangathan, an empirical e ...
General chemistry laboratory activities, Lorentz
... Laboratory flasks are vessels (containers) which in laboratory and other scientific settings, they are usually referred to simply as flasks. Flasks come in a number of shapes and a wide range of sizes which are specified by the volume they can hold, typically in metric units such as millilitres (mL) ...
... Laboratory flasks are vessels (containers) which in laboratory and other scientific settings, they are usually referred to simply as flasks. Flasks come in a number of shapes and a wide range of sizes which are specified by the volume they can hold, typically in metric units such as millilitres (mL) ...
Chapter 3: Stoichiometry
... FW of Ca(NO3)2 = 164.1 amu Molar Mass of Ca(NO3)2 = 164.1 g/mol MW of O2 = 2 x 16.0 amu = 32 amu Molar Mass of O2 = 32 g/mol ...
... FW of Ca(NO3)2 = 164.1 amu Molar Mass of Ca(NO3)2 = 164.1 g/mol MW of O2 = 2 x 16.0 amu = 32 amu Molar Mass of O2 = 32 g/mol ...
From Kinetics to Equilibrium
... (The gas inflates the bag.) This chemical reaction occurs almost instantaneously. It inflates the air bag quickly enough to cushion a driver’s impact. On the other hand, the reaction of iron with oxygen to form rust proceeds quite slowly. Most Canadians know that the combination of road salt and wet ...
... (The gas inflates the bag.) This chemical reaction occurs almost instantaneously. It inflates the air bag quickly enough to cushion a driver’s impact. On the other hand, the reaction of iron with oxygen to form rust proceeds quite slowly. Most Canadians know that the combination of road salt and wet ...
National German Competition and Problems of the IChO
... X is a colourless oil with a boiling point of 156 °C. It is used as starting material to produce different synthetic fibres such as Perlon or Dederon. Compound X consists of 73,43 % of carbon and 10,27 % of hyxdrogen. a) Complete the structural formulas of the intermediates A, B and the product X in ...
... X is a colourless oil with a boiling point of 156 °C. It is used as starting material to produce different synthetic fibres such as Perlon or Dederon. Compound X consists of 73,43 % of carbon and 10,27 % of hyxdrogen. a) Complete the structural formulas of the intermediates A, B and the product X in ...
Lewis acid catalysis
In Lewis acid catalysis of organic reactions, a metal-based Lewis acid acts as an electron pair acceptor to increase the reactivity of a substrate. Common Lewis acid catalysts are based on main group metals such as aluminum, boron, silicon, and tin, as well as many early (titanium, zirconium) and late (iron, copper, zinc) d-block metals. The metal atom forms an adduct with a lone-pair bearing electronegative atom in the substrate, such as oxygen (both sp2 or sp3), nitrogen, sulfur, and halogens. The complexation has partial charge-transfer character and makes the lone-pair donor effectively more electronegative, activating the substrate toward nucleophilic attack, heterolytic bond cleavage, or cycloaddition with 1,3-dienes and 1,3-dipoles.Many classical reactions involving carbon–carbon or carbon–heteroatom bond formation can be catalyzed by Lewis acids. Examples include the Friedel-Crafts reaction, the aldol reaction, and various pericyclic processes that proceed slowly at room temperature, such as the Diels-Alder reaction and the ene reaction. In addition to accelerating the reactions, Lewis acid catalysts are able to impose regioselectivity and stereoselectivity in many cases.Early developments in Lewis acid reagents focused on easily available compounds such as TiCl4, BF3, SnCl4, and AlCl3. The relative strengths of these (and other) Lewis acids may be estimated from NMR spectroscopy by the Childs method or the Gutmann-Beckett method. Over the years, versatile catalysts bearing ligands designed for specific applications have facilitated improvement in both reactivity and selectivity of Lewis acid-catalyzed reactions. More recently, Lewis acid catalysts with chiral ligands have become an important class of tools for asymmetric catalysis.Challenges in the development of Lewis acid catalysis include inefficient catalyst turnover (caused by catalyst affinity for the product) and the frequent requirement of two-point binding for stereoselectivity, which often necessitates the use of auxiliary groups.