Questions
... III The acidic solution in the beaker was filtered into a 250 cm3 volumetric flask. A small amount of solid impurity remained in the filter paper. The solution in the volumetric flask was carefully made up to 250 cm3 with distilled water. IV A pipette was used to transfer 25.0 cm3 portions of the ac ...
... III The acidic solution in the beaker was filtered into a 250 cm3 volumetric flask. A small amount of solid impurity remained in the filter paper. The solution in the volumetric flask was carefully made up to 250 cm3 with distilled water. IV A pipette was used to transfer 25.0 cm3 portions of the ac ...
Chemistry
... chemist John Dalton, revived the term when he suggested that each element was made up of unique atoms and the atoms of an element are all the same. At that time, there were about 35 known elements. This simple model could explain the millions of different materials around us. Differences between ato ...
... chemist John Dalton, revived the term when he suggested that each element was made up of unique atoms and the atoms of an element are all the same. At that time, there were about 35 known elements. This simple model could explain the millions of different materials around us. Differences between ato ...
Rutile titanium dioxide nanoparticles and ordered acicular
... COOH, (ii) (x-hydroxy carboxamides of the formula R4CH (OH)CONH2, and (iii) (x-amino acids of the formula R4CH (NH2)COOH, wherein R is an alkane, alkene, alkyne, arene, or cycloalkane group having 6 or more carbon atoms. ...
... COOH, (ii) (x-hydroxy carboxamides of the formula R4CH (OH)CONH2, and (iii) (x-amino acids of the formula R4CH (NH2)COOH, wherein R is an alkane, alkene, alkyne, arene, or cycloalkane group having 6 or more carbon atoms. ...
`A` LEVEL H2 CHEMISTRY ORGANIC REACTIONS SUMMARY By
... (g) explain the terms bond energy, bond length and bond polarity and use them to compare the reactivities of covalent bonds (h) describe intermolecular forces (van der Waals’ forces), based on permanent and induced dipoles, as in CHCl3(l); Br2(l) and the liquid noble gases (i) describe metallic bond ...
... (g) explain the terms bond energy, bond length and bond polarity and use them to compare the reactivities of covalent bonds (h) describe intermolecular forces (van der Waals’ forces), based on permanent and induced dipoles, as in CHCl3(l); Br2(l) and the liquid noble gases (i) describe metallic bond ...
Answer Key, Problem Set 6 – complete, with explanations
... ions, I have shown the ions as “touching” here—you could have shown them with a bit of space in between them as well, as long as the amount of space in between was roughly “equal” for all adjacent ions). To further ...
... ions, I have shown the ions as “touching” here—you could have shown them with a bit of space in between them as well, as long as the amount of space in between was roughly “equal” for all adjacent ions). To further ...
chem - CBSE Guess
... Ans. He shift the pH of the fresh milk to slightly alkaline because fresh milk is acidic in the nature and it turn sour specially in summer season.(B) In presence of baking soda,milk become slightly alkaline .the presence of alkali does not allow milk to become more acidic .Therefore it takes a long ...
... Ans. He shift the pH of the fresh milk to slightly alkaline because fresh milk is acidic in the nature and it turn sour specially in summer season.(B) In presence of baking soda,milk become slightly alkaline .the presence of alkali does not allow milk to become more acidic .Therefore it takes a long ...
analytical chemistry - Львівський національний медичний
... and physico-chemical properties. In all classifications there is a cations group, which does not have group peagent (cations of lithium, potassium, sodium, and ion of ammonium, which has the ion radius similar to the potassium ion). These are cations of the s1 elements with electronic structure of i ...
... and physico-chemical properties. In all classifications there is a cations group, which does not have group peagent (cations of lithium, potassium, sodium, and ion of ammonium, which has the ion radius similar to the potassium ion). These are cations of the s1 elements with electronic structure of i ...
2016 Chemistry Examination Paper
... Dihydromatricaria acid (DHMA), a colourless liquid excreted by soldier beetles, has several potential medical applications. The structural formula of DHMA is shown below: O HO ...
... Dihydromatricaria acid (DHMA), a colourless liquid excreted by soldier beetles, has several potential medical applications. The structural formula of DHMA is shown below: O HO ...
Chemistry of CHLORINE
... -Bromine, Chlorine and iodine exists as diatomic molecules bonded by strong covalent bond. Each molecule is joined to the other by weak intermolecular forces/ Van-der-waals forces. -The strength of intermolecular/Van-der-waals forces of attraction increase with increase in molecular size/atomic rad ...
... -Bromine, Chlorine and iodine exists as diatomic molecules bonded by strong covalent bond. Each molecule is joined to the other by weak intermolecular forces/ Van-der-waals forces. -The strength of intermolecular/Van-der-waals forces of attraction increase with increase in molecular size/atomic rad ...
NATIONAL HIGH SCHOOL CHEMISTRY EXAMINATION (1995
... From these data, she can conclude that a) both Ba(IO 3 ) 2 and Mg(ClO3 ) 2 are insoluble in water. b) both PbCrO4 and Mg(ClO3 ) 2 are insoluble in water. c) Ba(IO 3 ) 2 , Pb(IO 3 ) 2 , and PbCrO4 are insoluble in water. d) all of Ba(IO 3 ) 2 , Mg(ClO 3 ) 2 , Pb(IO 3 ) 2 , PbCrO4 , and CaCrO 4 are in ...
... From these data, she can conclude that a) both Ba(IO 3 ) 2 and Mg(ClO3 ) 2 are insoluble in water. b) both PbCrO4 and Mg(ClO3 ) 2 are insoluble in water. c) Ba(IO 3 ) 2 , Pb(IO 3 ) 2 , and PbCrO4 are insoluble in water. d) all of Ba(IO 3 ) 2 , Mg(ClO 3 ) 2 , Pb(IO 3 ) 2 , PbCrO4 , and CaCrO 4 are in ...
Module 2 Alcohols, halogenoalkanes and analysis
... Throughout the centuries, chemists have synthesised new substances and investigated their properties in the search for more useful materials. In the recent past, organic chemists have developed a broad range of original and exciting materials, such as pharmaceuticals, refrigerants, solvents and plas ...
... Throughout the centuries, chemists have synthesised new substances and investigated their properties in the search for more useful materials. In the recent past, organic chemists have developed a broad range of original and exciting materials, such as pharmaceuticals, refrigerants, solvents and plas ...
Nature of Materials in Serum That Interfere inthe Glucose Oxidase
... against a buffer solution to remove the glucose from the protein serum matrix (8-10), sq that interfering material of high-molecular-weight is excluded. Because automated methods are most frequently used for routine analysis, the interferences most often discussed are those caused by substances of l ...
... against a buffer solution to remove the glucose from the protein serum matrix (8-10), sq that interfering material of high-molecular-weight is excluded. Because automated methods are most frequently used for routine analysis, the interferences most often discussed are those caused by substances of l ...
LABORATORY MANUAL CHEMISTRY 121
... purpose of this exercise is to determine the rate law for the hydrolysis of trans-[Co(en)2Cl2]+ and to determine the activation energy for the hydrolysis reaction by carrying out the reaction at several different temperatures from 45C to 85C. The equation for the hydrolysis reaction is, trans-[Co( ...
... purpose of this exercise is to determine the rate law for the hydrolysis of trans-[Co(en)2Cl2]+ and to determine the activation energy for the hydrolysis reaction by carrying out the reaction at several different temperatures from 45C to 85C. The equation for the hydrolysis reaction is, trans-[Co( ...
Acids ,Bases and Salts
... This dissociation/ionization makes aqueous ammonia to: (i)turn litmus paper/solution blue. (ii)have pH 8/9/10/11 (iii)be a good electrical conductor (iv)react with acids to form ammonium salt and water only. NH4OH(aq) + HCl(aq) -> NH4Cl(aq) + H2O(l) (d)Ammonia gas dissolves in methylbenzene/benzene ...
... This dissociation/ionization makes aqueous ammonia to: (i)turn litmus paper/solution blue. (ii)have pH 8/9/10/11 (iii)be a good electrical conductor (iv)react with acids to form ammonium salt and water only. NH4OH(aq) + HCl(aq) -> NH4Cl(aq) + H2O(l) (d)Ammonia gas dissolves in methylbenzene/benzene ...
Class-X Science - Kendriya Vidyalaya Sangathan Regional Office
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
- Kendriya Vidyalaya No.1, Satna
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
X -Science Support Material
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
... Hydronium Ions: They are formed by reaction of H+ (from acid) and H2O. It is because H+ is unstable. Universal Indicator: A universal indicator is a mixture of indicators which shows a gradual but well-marked series of colour changes over a very wide range of change in concentration of H+ ion. Stron ...
Summer Study Assignment – Honors Chem 2/AP Chemistry
... must be obtained in the diet is methionine. What is the percentage of carbon, nitrogen, and sulfur in this amino acid if the formula of methionine is CH3SCH2CH2CHNH2COOH? 105. Ammonia is produced by the reaction of nitrogen and hydrogen according to this balanced equation: N2 (g) + 3 H2 (g) 2 NH3 ...
... must be obtained in the diet is methionine. What is the percentage of carbon, nitrogen, and sulfur in this amino acid if the formula of methionine is CH3SCH2CH2CHNH2COOH? 105. Ammonia is produced by the reaction of nitrogen and hydrogen according to this balanced equation: N2 (g) + 3 H2 (g) 2 NH3 ...
ism ismismismismismrapidrevisionquestionsismismismismismism
... (i) Combination between nitrogen and hydrogen to form ammonia in the presence of iron catalyst in Haber’s process. Fe N2 + 3H2 2NH3 (ii) Zeolites catalyst ZSM-5 is used to convert alcohol to gasoline by dehydration. (iii) The enzyme zymase converts glucose into ethyl alcohol and carbon dioxide. Zyma ...
... (i) Combination between nitrogen and hydrogen to form ammonia in the presence of iron catalyst in Haber’s process. Fe N2 + 3H2 2NH3 (ii) Zeolites catalyst ZSM-5 is used to convert alcohol to gasoline by dehydration. (iii) The enzyme zymase converts glucose into ethyl alcohol and carbon dioxide. Zyma ...
Acid
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form salts. Aqueous solutions of acids have a pH of less than 7. Non-aqueous acids are usually formed when an anion (negative ion) reacts with one or more positively charged hydrogen cations. A lower pH means a higher acidity, and thus a higher concentration of positive hydrogen ions in the solution. Chemicals or substances having the property of an acid are said to be acidic.There are three common definitions for acids: the Arrhenius definition, the Brønsted-Lowry definition, and the Lewis definition. The Arrhenius definition defines acids as substances which increase the concentration of hydrogen ions (H+), or more accurately, hydronium ions (H3O+), when dissolved in water. The Brønsted-Lowry definition is an expansion: an acid is a substance which can act as a proton donor. By this definition, any compound which can easily be deprotonated can be considered an acid. Examples include alcohols and amines which contain O-H or N-H fragments. A Lewis acid is a substance that can accept a pair of electrons to form a covalent bond. Examples of Lewis acids include all metal cations, and electron-deficient molecules such as boron trifluoride and aluminium trichloride.Common examples of acids include hydrochloric acid (a solution of hydrogen chloride which is found in gastric acid in the stomach and activates digestive enzymes), acetic acid (vinegar is a dilute solution of this liquid), sulfuric acid (used in car batteries), and tartaric acid (a solid used in baking). As these examples show, acids can be solutions or pure substances, and can be derived from solids, liquids, or gases. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid.