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 ...
Cyanuric Acid and Cyanurates
... The entropy changes and the heat effect of the HCN polymerization are calculated in [22], while the magnetic anisotropy and the charge delocalization in S-triazine are considered in [23]. The IR spectrum of the polymerized HCN is given in [3] (ν, cm–1): 3450, 3370, 3314, 3260, 3219, 3184 ν(NH2); 222 ...
... The entropy changes and the heat effect of the HCN polymerization are calculated in [22], while the magnetic anisotropy and the charge delocalization in S-triazine are considered in [23]. The IR spectrum of the polymerized HCN is given in [3] (ν, cm–1): 3450, 3370, 3314, 3260, 3219, 3184 ν(NH2); 222 ...
AS Chemistry 1
... Note: A bracket must be placed around a group or ion if it is multiplied by 2 or more and/or composed of more than one element. For example, MgBr2 no bracket required Ca(OH)2 bracket essential as CaOH2 is incorrect. x ...
... Note: A bracket must be placed around a group or ion if it is multiplied by 2 or more and/or composed of more than one element. For example, MgBr2 no bracket required Ca(OH)2 bracket essential as CaOH2 is incorrect. x ...
Basic chemistry help is available here for high school or college
... classroom students. All hard copy materials distributed under this exception must have on every page distributed reference to http://www.chemtutor.com as source. Under the same exception granted to classroom teachers, full recognition of Chemtutor must be given when all or any part is included in an ...
... classroom students. All hard copy materials distributed under this exception must have on every page distributed reference to http://www.chemtutor.com as source. Under the same exception granted to classroom teachers, full recognition of Chemtutor must be given when all or any part is included in an ...
Chapter 4 Chemical Quantities and Aqueous Reactions
... the reactant that limits the amount of product is called the limiting reactant sometimes called the limiting reagent the limiting reactant gets completely consumed ...
... the reactant that limits the amount of product is called the limiting reactant sometimes called the limiting reagent the limiting reactant gets completely consumed ...
48th CHEMISTRY OLYMPIAD CHEMISTRY
... reacts with sulfur to give yellow compound A. The reaction of the ions of an element Y with iodide iones in water solution produces yellow precipitate B. These substances are stable. At a reaction of metal X with the very diluted nitric acid the main products are NO and the ion of metal X, which is ...
... reacts with sulfur to give yellow compound A. The reaction of the ions of an element Y with iodide iones in water solution produces yellow precipitate B. These substances are stable. At a reaction of metal X with the very diluted nitric acid the main products are NO and the ion of metal X, which is ...
Synthesis and Structural Studies of Calcium and Magnesium
... reaction conditions to obtain X-ray quality crystals of the reaction products to allow for structural elucidation of the novel compounds. Various methodologies to aid in crystal growth including hydrothermal methods and gel crystallization were employed. We have used phosphinate and phosphonate liga ...
... reaction conditions to obtain X-ray quality crystals of the reaction products to allow for structural elucidation of the novel compounds. Various methodologies to aid in crystal growth including hydrothermal methods and gel crystallization were employed. We have used phosphinate and phosphonate liga ...
Section – B - About iTutoring
... (66). What is meant by hydrolysis of salt ? When salt is added to water, ions of salt react with water and produce acid and base is known as hydrolysis. (67). Which instrument is used to determine accurate pH of solution? pH meter is used to measure pH. (68). What is meant by hydrolysis constant ? H ...
... (66). What is meant by hydrolysis of salt ? When salt is added to water, ions of salt react with water and produce acid and base is known as hydrolysis. (67). Which instrument is used to determine accurate pH of solution? pH meter is used to measure pH. (68). What is meant by hydrolysis constant ? H ...
Concept based notes Chemistry Lab Manual
... Q. 73. Why, H2S gas passed in presence of NH4OH? Ans. When H2S gas is passed in alkaline medium or in presence of NH4OH, the H+ ions from the dissociation of H2S gas combine with hydroxyl ions (OH-) from the dissociation of NH4OH to from nearly unionised H2O. The removal of H+ ions from the solutio ...
... Q. 73. Why, H2S gas passed in presence of NH4OH? Ans. When H2S gas is passed in alkaline medium or in presence of NH4OH, the H+ ions from the dissociation of H2S gas combine with hydroxyl ions (OH-) from the dissociation of NH4OH to from nearly unionised H2O. The removal of H+ ions from the solutio ...
LaBrake, Fundamentals Diagnostic Questions
... a) The positive charge is densely found in the center of the atom, while the negatively charged electrons exist in a diffuse cloud outside the nucleus. b) Most of the space of an atom is empty space. c) The nuclear model in which the positive charge is held densely in the center of the atom is no lo ...
... a) The positive charge is densely found in the center of the atom, while the negatively charged electrons exist in a diffuse cloud outside the nucleus. b) Most of the space of an atom is empty space. c) The nuclear model in which the positive charge is held densely in the center of the atom is no lo ...
44. Find рН of formic acid solution with mass percent ω=5
... 15. Calculate mass percent of calcium carbonate in solution if molar concentration of the equivalent is 0,05 mol/L. 16. Calculate masses of water and iodine needed to prepare 500 g of 10% solution. 17. Determine mass of sodium tetraborate needed to prepare 500 ml of solution with molar concentratio ...
... 15. Calculate mass percent of calcium carbonate in solution if molar concentration of the equivalent is 0,05 mol/L. 16. Calculate masses of water and iodine needed to prepare 500 g of 10% solution. 17. Determine mass of sodium tetraborate needed to prepare 500 ml of solution with molar concentratio ...
Study materials of Chemistry for class XII
... meeting points of noble gas crystals are exceptionally low. Why? 1M Ans. Noble gases crystallise in close packed structures, but the forces of interaction between the atoms are weak dispersion forces and they therefore have low melting points. On the other hand, metals have strong metallic bonds (el ...
... meeting points of noble gas crystals are exceptionally low. Why? 1M Ans. Noble gases crystallise in close packed structures, but the forces of interaction between the atoms are weak dispersion forces and they therefore have low melting points. On the other hand, metals have strong metallic bonds (el ...
equilibrium - eVirtualGuru
... If you continue intertransferring coloured solution between the cylinders, there will not be any further change in the levels of coloured water in two cylinders. If we take analogy of ‘level’ of coloured water with ‘concentration’ of reactants and products in the two cylinders, we can say the proces ...
... If you continue intertransferring coloured solution between the cylinders, there will not be any further change in the levels of coloured water in two cylinders. If we take analogy of ‘level’ of coloured water with ‘concentration’ of reactants and products in the two cylinders, we can say the proces ...
Chapter 4: Reactions in Aqueous Solution
... 64. Which of the following represents an acid-base neutralization reaction? A) 2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g) B) SO2(g) + H2O(l) H2SO3(g) C) LiOH(aq) + HNO3(aq) LiNO3(aq) + H2O(l) D) 2KBr(aq) + Cl2(g) 2KCl(aq) + Br2(l) E) CaBr2(aq) + H2SO4(aq) CaSO4(s) + 2HBr(g) Ans: C Category ...
... 64. Which of the following represents an acid-base neutralization reaction? A) 2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g) B) SO2(g) + H2O(l) H2SO3(g) C) LiOH(aq) + HNO3(aq) LiNO3(aq) + H2O(l) D) 2KBr(aq) + Cl2(g) 2KCl(aq) + Br2(l) E) CaBr2(aq) + H2SO4(aq) CaSO4(s) + 2HBr(g) Ans: C Category ...
Grade XII Unit 1 - Ethiopian Ministry of Education
... Solution of liquids in liquids Ethanol mixes with water but oil does not. Why? Solubility is a measure of how much solute will dissolve in a solvent at a specific temperature. Do you know the principle “like dissolves like”? The “like dissolves like” principle is helpful in predicting the solubility ...
... Solution of liquids in liquids Ethanol mixes with water but oil does not. Why? Solubility is a measure of how much solute will dissolve in a solvent at a specific temperature. Do you know the principle “like dissolves like”? The “like dissolves like” principle is helpful in predicting the solubility ...
Chemistry 11 Final Examination Review
... a) Electrons can absorb or emit energy only in whole numbers of photons. b) Atoms have a central positively charged nucleus. c) Electrons move around the nucleus as planets orbit the sun. d) Most of the volume of an atom is empty space. 10. Which of the following orbitals is spherical in shape? a) 3 ...
... a) Electrons can absorb or emit energy only in whole numbers of photons. b) Atoms have a central positively charged nucleus. c) Electrons move around the nucleus as planets orbit the sun. d) Most of the volume of an atom is empty space. 10. Which of the following orbitals is spherical in shape? a) 3 ...
Name:
... 2. What is the equilibrium constant expression for the following equilibrium reaction? H2O(g) Cl2O(g) 2HOCl(g) 3. Determine the equilibrium constant for the following reaction, based on the equilibrium concentrations below. 3NO(g) N2O(g) NO2(g) [NO] 0.060 mol/L [N2O] 0.015 mol/L [NO2] ...
... 2. What is the equilibrium constant expression for the following equilibrium reaction? H2O(g) Cl2O(g) 2HOCl(g) 3. Determine the equilibrium constant for the following reaction, based on the equilibrium concentrations below. 3NO(g) N2O(g) NO2(g) [NO] 0.060 mol/L [N2O] 0.015 mol/L [NO2] ...
Experimental Chemistry I
... Purpose: Find the concentrations of the Standardized Acid / Base with the help of titration. The reaction between a strong acid and a strong base can be basically considered as a neutralization reaction. In a neutralization reaction, an acid reacts with a base to produce salt and water: NaOH(aq) + H ...
... Purpose: Find the concentrations of the Standardized Acid / Base with the help of titration. The reaction between a strong acid and a strong base can be basically considered as a neutralization reaction. In a neutralization reaction, an acid reacts with a base to produce salt and water: NaOH(aq) + H ...
Chemistry Appendixes
... Shaded circles indicate the parts you are expected to complete in a particular investigation report. One or more parts of an Evaluation may be required, as indicated by the numbers. ...
... Shaded circles indicate the parts you are expected to complete in a particular investigation report. One or more parts of an Evaluation may be required, as indicated by the numbers. ...
To do List
... For a neutral atom of an element to become a cation through a chemical reaction, which of the following must be true? A) the atom must lose protons; B) the atom must gain protons; C) the atom must lose electrons; D) the atom must gain electrons; E) the atom may either lose electrons or gain protons; ...
... For a neutral atom of an element to become a cation through a chemical reaction, which of the following must be true? A) the atom must lose protons; B) the atom must gain protons; C) the atom must lose electrons; D) the atom must gain electrons; E) the atom may either lose electrons or gain protons; ...
Hydroxide
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. It functions as a base, a ligand, a nucleophile and a catalyst. The hydroxide ion forms salts, some of which dissociate in aqueous solution, liberating solvated hydroxide ions. Sodium hydroxide is a multi-million-ton per annum commodity chemical. A hydroxide attached to a strongly electropositive center may itself ionize, liberating a hydrogen cation (H+), making the parent compound an acid.The corresponding electrically neutral compound •HO is the hydroxyl radical. The corresponding covalently-bound group -OH of atoms is the hydroxyl group.Hydroxide ion and hydroxyl group are nucleophiles and can act as a catalyst in organic chemistry.Many inorganic substances which bear the word ""hydroxide"" in their names are not ionic compounds of the hydroxide ion, but covalent compounds which contain hydroxyl groups.