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P-BLOCK ELEMENTS
... (a) Action of oxygen: All members when heated in oxygen form oxides. CO2, SiO2 and GeO2 are acidic whereas SnO2 and PbO2 are amphoteric. (b) Action of water: Only tin decomposes steam to form stannic dioxide and dihydrogen. Sn + 2H2O SnO2 + 2H2 (c) Action of halogen: All the elements form halide w ...
... (a) Action of oxygen: All members when heated in oxygen form oxides. CO2, SiO2 and GeO2 are acidic whereas SnO2 and PbO2 are amphoteric. (b) Action of water: Only tin decomposes steam to form stannic dioxide and dihydrogen. Sn + 2H2O SnO2 + 2H2 (c) Action of halogen: All the elements form halide w ...
Chlorine
... extracted from chlorides through oxidation often by electrolysis. With metals, it forms salts called chlorides. As the chloride ion, Cl−, it is also the most abundant dissolved ion in ocean water. 2 . 1 . Isotopes of chlorine : Chlorine has isotopes with mass numbers ranging from 32 to 40. There are ...
... extracted from chlorides through oxidation often by electrolysis. With metals, it forms salts called chlorides. As the chloride ion, Cl−, it is also the most abundant dissolved ion in ocean water. 2 . 1 . Isotopes of chlorine : Chlorine has isotopes with mass numbers ranging from 32 to 40. There are ...
stoichiometry - einstein classes
... e.g. Ammonia and all amines are monoacidic bases, NaOH(n = 1), Na2CO3(aq) n = 2, NaHCO3(n = 1) ...
... e.g. Ammonia and all amines are monoacidic bases, NaOH(n = 1), Na2CO3(aq) n = 2, NaHCO3(n = 1) ...
Study Modules XII Chemistry 2017
... 7. The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases.Explain. In metals with increase of temperature, the kernels start vibrating and thus offer resistance to the flow of electrons.Hence conductivity decreases. In case of semiconductors ...
... 7. The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases.Explain. In metals with increase of temperature, the kernels start vibrating and thus offer resistance to the flow of electrons.Hence conductivity decreases. In case of semiconductors ...
File - UTeach Dallas Project
... The candidates should be able to demonstrate knowledge and understanding in relation to:(a) scientific phenomena, facts, concepts, theories and laws. (b) scientific terminology, use of symbols, quantities and units. (c) scientific apparatus and instruments and their safe operations. (d) scientific q ...
... The candidates should be able to demonstrate knowledge and understanding in relation to:(a) scientific phenomena, facts, concepts, theories and laws. (b) scientific terminology, use of symbols, quantities and units. (c) scientific apparatus and instruments and their safe operations. (d) scientific q ...
CHAPTER 21 NONMETALLIC ELEMENTS AND THEIR COMPOUNDS
... The density of a gas depends on temperature, pressure, and the molar mass of the substance. When two gases are at the same pressure and temperature, the ratio of their densities should be the same as the ratio of their molar masses. The molar mass of ammonium chloride is 53.5 g/mol, and the ratio of ...
... The density of a gas depends on temperature, pressure, and the molar mass of the substance. When two gases are at the same pressure and temperature, the ratio of their densities should be the same as the ratio of their molar masses. The molar mass of ammonium chloride is 53.5 g/mol, and the ratio of ...
Chapter 2 Geochemical Reactions
... compounds such as O2 and N2, and between the S atoms in pyrite [FeS2] for example. Bonds between nonmetals with similar electronegativities also bond covalently. The silica cation Si4+ forms covalent bonds in tetrahedral coordination with O2– ions, giving silicate minerals like quartz a low solubili ...
... compounds such as O2 and N2, and between the S atoms in pyrite [FeS2] for example. Bonds between nonmetals with similar electronegativities also bond covalently. The silica cation Si4+ forms covalent bonds in tetrahedral coordination with O2– ions, giving silicate minerals like quartz a low solubili ...
LaBrake, Fundamentals Diagnostic Questions
... These are questions to be used to help you fully prepare for 1A. While these topics will be covered in the 1ABC series, they will only be covered extremely briefly. It is expected that your chemistry background has prepared you to handle questions of this nature. Various sources can be used to help ...
... These are questions to be used to help you fully prepare for 1A. While these topics will be covered in the 1ABC series, they will only be covered extremely briefly. It is expected that your chemistry background has prepared you to handle questions of this nature. Various sources can be used to help ...
CSEC Chemistry Revision Guide Answers.indd
... easily lost, so it ionises more easily than magnesium. 6. The state changes from gas to liquid to solid. The top two elements are gases at room temperature, the one below is a liquid and the one below that is a solid. 7. A reaction would occur. Chlorine is above bromine in group VII so it has a smal ...
... easily lost, so it ionises more easily than magnesium. 6. The state changes from gas to liquid to solid. The top two elements are gases at room temperature, the one below is a liquid and the one below that is a solid. 7. A reaction would occur. Chlorine is above bromine in group VII so it has a smal ...
OCR answers to the examination questions File
... (b) (i) Add Tollens’ reagent. Heat reaction in a water bath. But-2-enal gives a silver precipitate or silver mirror. (ii) Aldehydes can be oxidised but ketones cannot. (c) (i) CH3CH=CHCH2OH (ii) Redox reaction/reduction or addition. (d) C4H6O + 5O2 → 4CO2 + 3H2O 7 (a) (i) ...
... (b) (i) Add Tollens’ reagent. Heat reaction in a water bath. But-2-enal gives a silver precipitate or silver mirror. (ii) Aldehydes can be oxidised but ketones cannot. (c) (i) CH3CH=CHCH2OH (ii) Redox reaction/reduction or addition. (d) C4H6O + 5O2 → 4CO2 + 3H2O 7 (a) (i) ...
2. 2-Isopropyl-5-methylcyclohexanol on carbon skeletal
... 4. The acid-base properties of organic compounds. 31. Show the order of acidity increase for the following compounds: 1. 1,2-ethanediol>ethanol>4-nitrophenol>phenol 2. 1,2-ethanediol
... 4. The acid-base properties of organic compounds. 31. Show the order of acidity increase for the following compounds: 1. 1,2-ethanediol>ethanol>4-nitrophenol>phenol 2. 1,2-ethanediol
Acid-Base
... The hydrogen atom(s) bonded directly to the phosphorus atom is/are not acidic in aqueous solution; only those hydrogen atoms bonded to the oxygen atoms can be released as protons. (b) The acid strength is successively greater as the number of oxygen atoms increases because the very electronegative o ...
... The hydrogen atom(s) bonded directly to the phosphorus atom is/are not acidic in aqueous solution; only those hydrogen atoms bonded to the oxygen atoms can be released as protons. (b) The acid strength is successively greater as the number of oxygen atoms increases because the very electronegative o ...
Naphtyl-imidazo-anthraquinones as novel colorimetric
... been reported as suitable systems for colorimetric sensing since they are an example of electron acceptor groups that can be electronically connected with recognition units [1g,3]. There has been a renewal of interest over the past ten years in the 9,10-anthraquinone signalling unit due to its chemo ...
... been reported as suitable systems for colorimetric sensing since they are an example of electron acceptor groups that can be electronically connected with recognition units [1g,3]. There has been a renewal of interest over the past ten years in the 9,10-anthraquinone signalling unit due to its chemo ...
pH and ORP Applications Cyanide Waste Treatment
... For consistent treatment and stable control in this type of process, well-mixed reaction tanks with volume for adequate retention time are required as shown in Figure 1. Retention time is calculated as the filled or usable tank volume divided by the waste flow rate and should typically be 10 minutes ...
... For consistent treatment and stable control in this type of process, well-mixed reaction tanks with volume for adequate retention time are required as shown in Figure 1. Retention time is calculated as the filled or usable tank volume divided by the waste flow rate and should typically be 10 minutes ...
1412_lecture_ch16 Fall_2014
... The formation constant, Kf, is the equilibrium constant for the formation of a complex ion from the aqueous metal ion and the ligands. The large value means that the complex ion is quite stable. When a large amount of NH3 is added to a solution of Ag+, you expect most of the Ag+ ion to react to form ...
... The formation constant, Kf, is the equilibrium constant for the formation of a complex ion from the aqueous metal ion and the ligands. The large value means that the complex ion is quite stable. When a large amount of NH3 is added to a solution of Ag+, you expect most of the Ag+ ion to react to form ...
The Advanced Placement Examination in Chemistry Acid–Base
... The hydrogen atom(s) bonded directly to the phosphorus atom is/are not acidic in aqueous solution; only those hydrogen atoms bonded to the oxygen atoms can be released as protons. (b) The acid strength is successively greater as the number of oxygen atoms increases because the very electronegative o ...
... The hydrogen atom(s) bonded directly to the phosphorus atom is/are not acidic in aqueous solution; only those hydrogen atoms bonded to the oxygen atoms can be released as protons. (b) The acid strength is successively greater as the number of oxygen atoms increases because the very electronegative o ...
The decomposition of hydrogen peroxide to form water and oxygen
... and inverted several times. The I- ion reacts with I2 to form the I3- ion, a linear species. ...
... and inverted several times. The I- ion reacts with I2 to form the I3- ion, a linear species. ...
Mole calculations File
... • Place 5 pieces of magnesium ribbon in the ignition tube • EITHER: Fill a 100 cm3 measuring cylinder with water and place upside down in a plastic bowl 2/3rds full of water. Arrange an upward delivery tube to collect the hydrogen gas • OR: Attach a gas syringe • Add 40+ cm3 hydrochloric acid to the ...
... • Place 5 pieces of magnesium ribbon in the ignition tube • EITHER: Fill a 100 cm3 measuring cylinder with water and place upside down in a plastic bowl 2/3rds full of water. Arrange an upward delivery tube to collect the hydrogen gas • OR: Attach a gas syringe • Add 40+ cm3 hydrochloric acid to the ...
AVOGADRO EXAMS 1991 - 2002 PRACTICE BOOKLET
... (a) Ionic hydrides, polymeric covalent oxides and amphoteric oxides (b) Covalent hydrides, ionic oxides and amphoteric oxides (c) Covalent hydrides, molecular covalent oxides and acidic oxides (d) Covalent hydrides, polymeric covalent oxides and amphoteric oxides (e) Ionic hydrides, ionic oxides and ...
... (a) Ionic hydrides, polymeric covalent oxides and amphoteric oxides (b) Covalent hydrides, ionic oxides and amphoteric oxides (c) Covalent hydrides, molecular covalent oxides and acidic oxides (d) Covalent hydrides, polymeric covalent oxides and amphoteric oxides (e) Ionic hydrides, ionic oxides and ...
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.