IIT-JEE - Brilliant Public School Sitamarhi
... Q.30 A strong current of trivalent gaseous boron passed through a germanium crystal decreases the density of the crystal due to part replacement of germanium by boron and due to interstitial vacancies created by missing Ge atoms. In one such experiment, one gram of germanium is taken and the boron a ...
... Q.30 A strong current of trivalent gaseous boron passed through a germanium crystal decreases the density of the crystal due to part replacement of germanium by boron and due to interstitial vacancies created by missing Ge atoms. In one such experiment, one gram of germanium is taken and the boron a ...
Document
... reaction is started with [H2 ]0 = 0.76 M, [N2]0 = 0.60 M and [NH3]0= 0.48 M. Which of the following is correct as the reaction comes to equilibrium? A) The concentration of N2will increase B) The concentration of H2will decrease C) The concentration of NH3will decrease D) The concentration of both N ...
... reaction is started with [H2 ]0 = 0.76 M, [N2]0 = 0.60 M and [NH3]0= 0.48 M. Which of the following is correct as the reaction comes to equilibrium? A) The concentration of N2will increase B) The concentration of H2will decrease C) The concentration of NH3will decrease D) The concentration of both N ...
Chemistry - Department of Education and Skills
... examine them and investigate relevant reactions at the laboratory bench. There is no better way to ‘bring chemistry to life’ than with suitable laboratory practical work. While it is vitally important that appropriate safety precautions be taken at all times it is also important that students be en ...
... examine them and investigate relevant reactions at the laboratory bench. There is no better way to ‘bring chemistry to life’ than with suitable laboratory practical work. While it is vitally important that appropriate safety precautions be taken at all times it is also important that students be en ...
Question Bank for Pre Board Exam(XII Chemistry)
... NA = 6.02 x 1023 mol-1) An element crystallises in a cubic close packed structure having a fcc unit cell of an edge 200 pm. Calculate the density if 200 g of this element contain 24 × 1023 atoms? 1. An element crystallizes in FCC structure; 200 g of this element has 4.12X 1024 atoms. If the density ...
... NA = 6.02 x 1023 mol-1) An element crystallises in a cubic close packed structure having a fcc unit cell of an edge 200 pm. Calculate the density if 200 g of this element contain 24 × 1023 atoms? 1. An element crystallizes in FCC structure; 200 g of this element has 4.12X 1024 atoms. If the density ...
guess paper class xii
... Calculate the mass of a non-volatile solute (molecular mass 40) which should be dissolved in 114 gm octane to reduce its vapour pressure to 80%. 16 In a fuel cell (a device for producing electricity directly from chemical reaction) , methanol is used as fuel and oxygen gas is used as an oxidizer. Th ...
... Calculate the mass of a non-volatile solute (molecular mass 40) which should be dissolved in 114 gm octane to reduce its vapour pressure to 80%. 16 In a fuel cell (a device for producing electricity directly from chemical reaction) , methanol is used as fuel and oxygen gas is used as an oxidizer. Th ...
Unit 7 Reaction Rates and Equilibrium Notes
... Le Châtelier’s Principle: - a qualitative method to predict the shift on an equilibrium system if it is disturbed by means of changing concentration, pressure and temperature. - the equilibrium will shift in the direction that minimizes the change imposed on the system. 1. Effects of a Change in Con ...
... Le Châtelier’s Principle: - a qualitative method to predict the shift on an equilibrium system if it is disturbed by means of changing concentration, pressure and temperature. - the equilibrium will shift in the direction that minimizes the change imposed on the system. 1. Effects of a Change in Con ...
Sample pages 2 PDF
... dimers and trimers have higher electron affinity than the initial precursor. It is assumed that reduction will go predominantly by transition of electron from a reducing agent to these dimer and trimer intermediates on the way to clusters and seeds [33]. At that, association of complexes to a cluste ...
... dimers and trimers have higher electron affinity than the initial precursor. It is assumed that reduction will go predominantly by transition of electron from a reducing agent to these dimer and trimer intermediates on the way to clusters and seeds [33]. At that, association of complexes to a cluste ...
Inorganic Chemistry
... be nearly this long. This book is not a survey of the literature or a research monograph. It is a textbook that is intended to provide the background necessary for the reader to move on to those more advanced resources. In writing this book, I have attempted to produce a concise textbook that meets ...
... be nearly this long. This book is not a survey of the literature or a research monograph. It is a textbook that is intended to provide the background necessary for the reader to move on to those more advanced resources. In writing this book, I have attempted to produce a concise textbook that meets ...
SQA Advanced Higher Chemistry Unit 2 Principles of Chemical
... there in this sample of iron ore? How pure is this sample of anti-viral drug?) It is also critical for industrial chemistry. (How many tonnes of sulphuric acid and phosphate rock are required to manufacture this batch of fertiliser? What proportion of monomers are required to prepare this plastic?) ...
... there in this sample of iron ore? How pure is this sample of anti-viral drug?) It is also critical for industrial chemistry. (How many tonnes of sulphuric acid and phosphate rock are required to manufacture this batch of fertiliser? What proportion of monomers are required to prepare this plastic?) ...
coordination of some monodentate and hybrid multident ate
... The complexing ability of tertiary phosphines arises from the donation of the lone-pair of electrons on the phosphorus atom, and such phosphine belong to the “soft” base group of Pearson’s hard/soft acicFbase (HSAB) theory.3'5 This theory predicts that phosphorus bases should bind more strongly to “ ...
... The complexing ability of tertiary phosphines arises from the donation of the lone-pair of electrons on the phosphorus atom, and such phosphine belong to the “soft” base group of Pearson’s hard/soft acicFbase (HSAB) theory.3'5 This theory predicts that phosphorus bases should bind more strongly to “ ...
Application of Novel Phosphine Ligands in Palladium
... rate-determining for the whole reaction. The third part of catalyzed reactions constitutes the transformations promoted by biomolecules, namely enzymes. Thus, nature can be considered as the world’s leading catalyst designer providing the most selective, active and complex catalysts. Biocatalysis is ...
... rate-determining for the whole reaction. The third part of catalyzed reactions constitutes the transformations promoted by biomolecules, namely enzymes. Thus, nature can be considered as the world’s leading catalyst designer providing the most selective, active and complex catalysts. Biocatalysis is ...
Homework extension
... Keywords Electrolysis: Decomposing a compound (an electrolyte) into separate elements using energy from a D.C (direct current) supply. Oxidation: Loses electrons Reduction: Gains electrons OIL RIG Oxidation Is Loss Reduction Is Gain To do electrolysis you must dissolve or melt the compound so that t ...
... Keywords Electrolysis: Decomposing a compound (an electrolyte) into separate elements using energy from a D.C (direct current) supply. Oxidation: Loses electrons Reduction: Gains electrons OIL RIG Oxidation Is Loss Reduction Is Gain To do electrolysis you must dissolve or melt the compound so that t ...
HOTS Worksheet
... Ans. The (— CO — NH —) amide bond in nylon gets hydrolysed. Q. 2. Fibres are of crystalline structure. Why ? 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 ...
... Ans. The (— CO — NH —) amide bond in nylon gets hydrolysed. Q. 2. Fibres are of crystalline structure. Why ? 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 ...
Chapter 16 Controlling the yield of reactions
... a Calculate the concentration of HI in this mixture. b Another mixture was prepared by placing 4.0 mol of HI in a 2.0 L vessel at 330°C. At equilibrium 0.44 mol of H2 and 0.44 mol of I2 were present. Calculate the value of the equilibrium constant at this temperature. c A third mixture consisted of ...
... a Calculate the concentration of HI in this mixture. b Another mixture was prepared by placing 4.0 mol of HI in a 2.0 L vessel at 330°C. At equilibrium 0.44 mol of H2 and 0.44 mol of I2 were present. Calculate the value of the equilibrium constant at this temperature. c A third mixture consisted of ...
A* PLC Legacy GCSE Chemistry (all boards)
... Keywords Electrolysis: Decomposing a compound (an electrolyte) into separate elements using energy from a D.C (direct current) supply. Oxidation: Loses electrons Reduction: Gains electrons OIL RIG Oxidation Is Loss Reduction Is Gain To do electrolysis you must dissolve or melt the compound so that t ...
... Keywords Electrolysis: Decomposing a compound (an electrolyte) into separate elements using energy from a D.C (direct current) supply. Oxidation: Loses electrons Reduction: Gains electrons OIL RIG Oxidation Is Loss Reduction Is Gain To do electrolysis you must dissolve or melt the compound so that t ...
Chapter 4 Aqueous Reactions and Solution Stoichiometry
... Zn (s) + 2 CuNO3 (aq) 2 Cu (s) + Zn(NO3)2 (aq) Cu (s) + 2 AgNO3 (aq) 2 Ag (s) + Cu(NO3)2 (aq) HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l) ...
... Zn (s) + 2 CuNO3 (aq) 2 Cu (s) + Zn(NO3)2 (aq) Cu (s) + 2 AgNO3 (aq) 2 Ag (s) + Cu(NO3)2 (aq) HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l) ...
PREPARATION, STRUCTURAL STUDIES AND CHEMICAL
... derivative (4, Y = Ph)47; which indicates considerable changes in the ionic character of this bond. The endocyclic C-I-O bond angle is typically around 80°, which is a ...
... derivative (4, Y = Ph)47; which indicates considerable changes in the ionic character of this bond. The endocyclic C-I-O bond angle is typically around 80°, which is a ...
Chm 2
... For the reaction represented by the equation Cl2 + 2KBr 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide? a. 0.119 mol c. 0.581 mol b. 0.236 mol d. 1.00 mol For the reaction represented by the equation 3Fe + 4H2O Fe3O4 + 4H2, how many moles of iron(II ...
... For the reaction represented by the equation Cl2 + 2KBr 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide? a. 0.119 mol c. 0.581 mol b. 0.236 mol d. 1.00 mol For the reaction represented by the equation 3Fe + 4H2O Fe3O4 + 4H2, how many moles of iron(II ...
Problem 1-2 - IPN-Kiel
... In its covalent compounds oxygen has in most cases the coordination number 1, 2 or 3. c) ...
... In its covalent compounds oxygen has in most cases the coordination number 1, 2 or 3. c) ...
PowerPoint Presentation - Chemical Equilibrium
... reactions considered until now have had reactants react completely to form products. These reactions “went” only in one direction. Some reactions can react in either direction. They are “reversible”. When this occurs some amount of reactant(s) will always remain in the final reaction mixture. ...
... reactions considered until now have had reactants react completely to form products. These reactions “went” only in one direction. Some reactions can react in either direction. They are “reversible”. When this occurs some amount of reactant(s) will always remain in the final reaction mixture. ...
laman web smk raja perempuan, ipoh
... Learning outcome Cl2CHCOOH and CI3CCOOH ; between CH2CH2CH2COOH and CH3CH2CHCICOOH 21. use the concept of delocalisation of electrons to explain the differences in acidity between ethanol and phenol, as well as the differences in basicity between CH3NH2 and C6H5NH2 Candidates should be able to : 1. ...
... Learning outcome Cl2CHCOOH and CI3CCOOH ; between CH2CH2CH2COOH and CH3CH2CHCICOOH 21. use the concept of delocalisation of electrons to explain the differences in acidity between ethanol and phenol, as well as the differences in basicity between CH3NH2 and C6H5NH2 Candidates should be able to : 1. ...
Carbon dioxide capture and utilization in petrochemical industry
... requirement for regeneration, easy oxidation/degradation by SO2 and O2 in flue gas and system corrosion [21, 22]. Aqueous ammonia has the advantage of high-absorption efficiency, high-absorption capacity, low-energy requirement for absorbent regeneration and wide distribution of resources. In Table ...
... requirement for regeneration, easy oxidation/degradation by SO2 and O2 in flue gas and system corrosion [21, 22]. Aqueous ammonia has the advantage of high-absorption efficiency, high-absorption capacity, low-energy requirement for absorbent regeneration and wide distribution of resources. In Table ...
REVIEWS Environmental remediation by photocatalysis R. Vinu AND Giridhar Madras
... reducing power of the CB electrons. Moreover, these interfacial electron transfer steps compete with the electron-hole recombination reaction (10 ns) and hence, the practical efficiency or quantum yield is always lesser than that of the theoretical yield. The organic compounds degrade through the form ...
... reducing power of the CB electrons. Moreover, these interfacial electron transfer steps compete with the electron-hole recombination reaction (10 ns) and hence, the practical efficiency or quantum yield is always lesser than that of the theoretical yield. The organic compounds degrade through the form ...
Rubidium
... This element is considered to be the 16th most abundant element in the earth's crust. It occurs naturally in the minerals leucite, pollucite, and zinnwaldite, which contains traces of up to 1% of its oxide. Lepidolite contains 1.5% rubidium and this is the commercial source of the element. Some pota ...
... This element is considered to be the 16th most abundant element in the earth's crust. It occurs naturally in the minerals leucite, pollucite, and zinnwaldite, which contains traces of up to 1% of its oxide. Lepidolite contains 1.5% rubidium and this is the commercial source of the element. Some pota ...
Now! - Soojeede.com
... an accomplishment for a scientist in the late 19 century with very little technology but with the combination of knowledge and intellect available at the time. Arrhenius led the way to our understanding of how acids and bases differed, their properties, and their reactions. We may not realize how mu ...
... an accomplishment for a scientist in the late 19 century with very little technology but with the combination of knowledge and intellect available at the time. Arrhenius led the way to our understanding of how acids and bases differed, their properties, and their reactions. We may not realize how mu ...
Photoredox catalysis
Photoredox catalysis is a branch of catalysis that harnesses the energy of visible light to accelerate a chemical reaction via a single-electron transfer. This area is named as a combination of ""photo-"" referring to light and redox, a condensed expression for the chemical processes of reduction and oxidation. In particular, photoredox catalysis employs small quantities of a light-sensitive compound that, when excited by light, can mediate the transfer of electrons between chemical compounds that otherwise would not react. Photoredox catalysts are generally drawn from three classes of materials: transition-metal complexes, organic dyes and semiconductors. While each class of materials has advantages, soluble transition-metal complexes are used most often.Study of this branch of catalysis led to the development of new methods to accomplish known and new chemical transformations. One attraction to the area is that photoredox catalysts are often less toxic than other reagents often used to generate free radicals, such as organotin reagents. Furthermore, while photoredox catalysts generate potent redox agents while exposed to light, they are innocuous under ordinary conditions Thus transition-metal complex photoredox catalysts are in some ways more attractive than stoichiometric redox agents such as quinones. The properties of photoredox catalysts can be modified by changing ligands and the metal, reflecting the somewhat modular nature of the catalyst.While photoredox catalysis has most often been applied to generate known reactive intermediates in a novel way, the study of this mode of catalysis led to the discovery of new organic reactions, such as the first direct functionalization of the β-arylation of saturated aldehydes. Although the D3-symmetric transition-metal complexes used in many photoredox-catalyzed reactions are chiral, the use of enantioenriched photoredox catalysts led to low levels of enantioselectivity in a photoredox-catalyzed aryl-aryl coupling reaction, suggesting that the chiral nature of these catalysts is not yet a highly effective means of transmitting stereochemical information in photoredox reactions. However, while synthetically useful levels of enantioselectivity have not been achieved using chiral photoredox catalysts alone, optically-active products have been obtained through the synergistic combination of photoredox catalysis with chiral organocatalysts such as secondary amines and Brønsted acids.