An Efficient Synthetic Route to Glycoamino Acid Building Blocks for
... excess of amino acid with TBTU, HOBt, and DIPEA in DMF for 4 h, followed by Fmoc deprotection using 20% piperidine in DMF for 1 h. All amino acid coupling steps were single couplings except for coupling of the glycoamino acids 4a and 4b, which were incorporated into peptide using double coupling bef ...
... excess of amino acid with TBTU, HOBt, and DIPEA in DMF for 4 h, followed by Fmoc deprotection using 20% piperidine in DMF for 1 h. All amino acid coupling steps were single couplings except for coupling of the glycoamino acids 4a and 4b, which were incorporated into peptide using double coupling bef ...
Analytical Chemistry
... information thus, C2H6O is both the empirical and the chemical formula for the chemically ferent ethanol , C2H5OH, and dimethyl ether CH3OCH3 . 5. The mole: It is gram formula weight per formula weight (M.wt.,which is the summation of the atomic weights in grams for all of the atoms in the atoms in ...
... information thus, C2H6O is both the empirical and the chemical formula for the chemically ferent ethanol , C2H5OH, and dimethyl ether CH3OCH3 . 5. The mole: It is gram formula weight per formula weight (M.wt.,which is the summation of the atomic weights in grams for all of the atoms in the atoms in ...
Question Paper - Revision Science
... (c) Which could be a graph of rate of reaction, on the vertical axis, against the square of the concentration of a reactant for a second order reaction? ...
... (c) Which could be a graph of rate of reaction, on the vertical axis, against the square of the concentration of a reactant for a second order reaction? ...
Chapter 4: Chemical Quantities and Aqueous Reactions
... solution of acetic acid, CH3COOH, the bulb in the electric circuit glows only very dimly. (b) When the beaker contains a 1 M solution of ammonia, NH3, the bulb again glows only dimly. (c) When the two solutions are in the same beaker, the bulb glows brightly. What happens when the two solutions are ...
... solution of acetic acid, CH3COOH, the bulb in the electric circuit glows only very dimly. (b) When the beaker contains a 1 M solution of ammonia, NH3, the bulb again glows only dimly. (c) When the two solutions are in the same beaker, the bulb glows brightly. What happens when the two solutions are ...
File
... b) Nucleus: the dense centre region of an atom. It contains the protons and neutrons (if there are any). c) Proton: a sub-atomic particle that is found it nucleus of an atom. Protons have a charge of 1+ and a mass of 1 amu. d) Neutron: a sub-atomic particle that is found in the nucleus of an atom. N ...
... b) Nucleus: the dense centre region of an atom. It contains the protons and neutrons (if there are any). c) Proton: a sub-atomic particle that is found it nucleus of an atom. Protons have a charge of 1+ and a mass of 1 amu. d) Neutron: a sub-atomic particle that is found in the nucleus of an atom. N ...
Chem. 31 * 9/15 Lecture
... – Everyone here but Lab Sect. 7 (in Sequoia 426) – Need to bring Scantron Form SC982-E ...
... – Everyone here but Lab Sect. 7 (in Sequoia 426) – Need to bring Scantron Form SC982-E ...
Unit 1 – Physical Science and Chemical Reactions
... eg. CH3COOH(aq) (not HCH3COO(aq)): acetic acid (vinegar) Properties of Acids 1. are solids, liquids, and gases as pure substances at room temperature (like molecular substances) 2. are soluble in water (like all ionic and some molecular substances) 3. form coloured and colourless solutions (like i ...
... eg. CH3COOH(aq) (not HCH3COO(aq)): acetic acid (vinegar) Properties of Acids 1. are solids, liquids, and gases as pure substances at room temperature (like molecular substances) 2. are soluble in water (like all ionic and some molecular substances) 3. form coloured and colourless solutions (like i ...
2013-2014
... A. magnesium + steam B. zinc + solid citric acid C. iron + orange juice D. calcium + water 3. Which of the following compounds would react with ammonium sulphate on heating? A. Concentrated sulphuric acid B. Dilute hydrochloric acid C. Sodium chloride solution D. Sodium hydroxide solution 4. Which o ...
... A. magnesium + steam B. zinc + solid citric acid C. iron + orange juice D. calcium + water 3. Which of the following compounds would react with ammonium sulphate on heating? A. Concentrated sulphuric acid B. Dilute hydrochloric acid C. Sodium chloride solution D. Sodium hydroxide solution 4. Which o ...
CHEM 13 NEWS EXAM 1998 - University of Waterloo
... 22. Two flexible containers for gases are at the same temperature and pressure. One holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. Which one of the following statements regarding these gas samples is false? (The relative atomic mass of oxygen is 16.0 and that of hydrogen is 1. ...
... 22. Two flexible containers for gases are at the same temperature and pressure. One holds 0.50 grams of hydrogen and the other holds 8.0 grams of oxygen. Which one of the following statements regarding these gas samples is false? (The relative atomic mass of oxygen is 16.0 and that of hydrogen is 1. ...
File - Mc Guckin Science
... b) Nucleus: the dense centre region of an atom. It contains the protons and neutrons (if there are any). c) Proton: a sub-atomic particle that is found it nucleus of an atom. Protons have a charge of 1+ and a mass of 1 amu. d) Neutron: a sub-atomic particle that is found in the nucleus of an atom. N ...
... b) Nucleus: the dense centre region of an atom. It contains the protons and neutrons (if there are any). c) Proton: a sub-atomic particle that is found it nucleus of an atom. Protons have a charge of 1+ and a mass of 1 amu. d) Neutron: a sub-atomic particle that is found in the nucleus of an atom. N ...
Chapter 6
... which an insoluble solid (precipitate) drops out of the solution. – Clear solutions of two ionic compounds when mixed form a cloudy solution (cloudiness indicates solid) ...
... which an insoluble solid (precipitate) drops out of the solution. – Clear solutions of two ionic compounds when mixed form a cloudy solution (cloudiness indicates solid) ...
intermediate chemistry may 2011 marking scheme
... since in pure water [H+] = [OH-] and since [H+] = 10-7 mol dm-3 from the pH value, the hydroxide concentration is also 10-7 mol dm-3 (e) HCl is described as a strong acid and methanoic acid HCO2H is described as a weak acid. (i) Explain clearly the meaning of the terms in italics. Stong acid = one w ...
... since in pure water [H+] = [OH-] and since [H+] = 10-7 mol dm-3 from the pH value, the hydroxide concentration is also 10-7 mol dm-3 (e) HCl is described as a strong acid and methanoic acid HCO2H is described as a weak acid. (i) Explain clearly the meaning of the terms in italics. Stong acid = one w ...
Document
... You will need to use the Periodic Table of the Elements to answer this question. (a) A radioactive isotope of the element iodine, 1251, is used to treat cancer. How many electrons and how many neutrons are there in one atom of this isotope of iodine? ...
... You will need to use the Periodic Table of the Elements to answer this question. (a) A radioactive isotope of the element iodine, 1251, is used to treat cancer. How many electrons and how many neutrons are there in one atom of this isotope of iodine? ...
AQA GCSE Chemistry My Revision Notes
... A school chemistry technician was tidying up in the outside chemical store. Four bottles of chemicals were found where the labels were unclear. The technician thought they were potassium carbonate, potassium chloride, potassium sulfate and aluminium sulfate. The following reagents were readily avail ...
... A school chemistry technician was tidying up in the outside chemical store. Four bottles of chemicals were found where the labels were unclear. The technician thought they were potassium carbonate, potassium chloride, potassium sulfate and aluminium sulfate. The following reagents were readily avail ...
Carboxylic Acids - BSAK Chemistry weebly
... there are two electronegative atoms attached to it. In an alkyl chloride, all you have attached is one chlorine atom which is fairly, but not very, electronegative. ...
... there are two electronegative atoms attached to it. In an alkyl chloride, all you have attached is one chlorine atom which is fairly, but not very, electronegative. ...
Chemistry - CBSE Academic
... Elevation in boiling point is a colligative property which depends on the number of particles. NaCl is an ionic compound which dissociates in solution to give more number of particles whereas sugar is made up of molecules and ...
... Elevation in boiling point is a colligative property which depends on the number of particles. NaCl is an ionic compound which dissociates in solution to give more number of particles whereas sugar is made up of molecules and ...
1. All the questions are compulsory. 2. Q. N
... Elevation in boiling point is a colligative property which depends on the number of particles. NaCl is an ionic compound which dissociates in solution to give more number of particles whereas sugar is made up of molecules and ...
... Elevation in boiling point is a colligative property which depends on the number of particles. NaCl is an ionic compound which dissociates in solution to give more number of particles whereas sugar is made up of molecules and ...
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.