chemistry intermediate may 2010 marking scheme
... 23. Identify the substances A to O and explain as fully as you can the changes recorded. Credit will be given if balanced equations are written where appropriate. (a) A is a white crystalline solid with a high melting point. A gives a lilac colour when flametested. When aqueous silver nitrate is add ...
... 23. Identify the substances A to O and explain as fully as you can the changes recorded. Credit will be given if balanced equations are written where appropriate. (a) A is a white crystalline solid with a high melting point. A gives a lilac colour when flametested. When aqueous silver nitrate is add ...
35 - TAMU Chemistry
... NH3(g) + 2O2(g) → HNO3(aq) + H2O Uses of Nitric Acid HNO3 1) To make NH4NO3 for fertilizers NH3 + HNO3→ NH4NO3 2) To make NH4NO3 for explosives Alfred Nobel, a Swedish chemist, discovered how to safely handle nitroglycerine with the NH4NO3 and amassed a fortune, some of which he used to fund the ...
... NH3(g) + 2O2(g) → HNO3(aq) + H2O Uses of Nitric Acid HNO3 1) To make NH4NO3 for fertilizers NH3 + HNO3→ NH4NO3 2) To make NH4NO3 for explosives Alfred Nobel, a Swedish chemist, discovered how to safely handle nitroglycerine with the NH4NO3 and amassed a fortune, some of which he used to fund the ...
welcome to ap chemistry - Garnet Valley School District
... I am delighted that you have chosen to take AP chemistry this fall. It is a challenging course and a strong foundation is necessary for your success. The material included in the summer work packet will enable you to cover the basics of chemistry, which are covered in chapters 1, 2, 3 and 4 of the t ...
... I am delighted that you have chosen to take AP chemistry this fall. It is a challenging course and a strong foundation is necessary for your success. The material included in the summer work packet will enable you to cover the basics of chemistry, which are covered in chapters 1, 2, 3 and 4 of the t ...
CHEMISTRY REVISION GUIDE for CIE IGCSE Coordinated Science
... melting. As the liquid is heated more, the particles gain so much energy that the forces of attraction break completely allowing particles to ‘fly around’ as a gas – this is called boiling. The reverse of the these processes are condensing and freezing. Under specific conditions, some solids can tur ...
... melting. As the liquid is heated more, the particles gain so much energy that the forces of attraction break completely allowing particles to ‘fly around’ as a gas – this is called boiling. The reverse of the these processes are condensing and freezing. Under specific conditions, some solids can tur ...
Chapter 6: Chemical Reactions – Study Guide
... 3. For each statement, write “yes” if evidence of a chemical reaction is present. Write “no” if there is no evidence of a chemical reaction. a) __________A tomato smells rotten. b) __________A drinking glass breaks into smaller pieces. c) __________A piece of ice melts. d) __________Drain cleaner is ...
... 3. For each statement, write “yes” if evidence of a chemical reaction is present. Write “no” if there is no evidence of a chemical reaction. a) __________A tomato smells rotten. b) __________A drinking glass breaks into smaller pieces. c) __________A piece of ice melts. d) __________Drain cleaner is ...
Past AP FRQ`s Linked to Text Chapters
... - A solution of 1.0-molar HCl - A solution of concentrated HNO3 (a) Which metal can be easily identified because it is much softer than the other two? Describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. Write a balanced chemical equation f ...
... - A solution of 1.0-molar HCl - A solution of concentrated HNO3 (a) Which metal can be easily identified because it is much softer than the other two? Describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. Write a balanced chemical equation f ...
Practical and Efficient Synthesis of -Aminophosphonic Acids
... rigid unusual secondary α-amino acids, where the nitrogen is involved in a ring, may result in significant consequences for the conformation of peptidomimetics as synthetic tools for drug discovery [1,2]. Some of the most important molecules are the 1,2,3,4-tetrahydroquinoline-2-carboxylic acid 1 [3 ...
... rigid unusual secondary α-amino acids, where the nitrogen is involved in a ring, may result in significant consequences for the conformation of peptidomimetics as synthetic tools for drug discovery [1,2]. Some of the most important molecules are the 1,2,3,4-tetrahydroquinoline-2-carboxylic acid 1 [3 ...
General, Organic, and Biological Chemistry
... 46) Isotopes are atoms of the same element that have A) different atomic numbers. B) the same atomic numbers but different numbers of protons. C) the same atomic numbers but different numbers of electrons. D) the same atomic number but different numbers of neutrons. E) the same atomic mass but diff ...
... 46) Isotopes are atoms of the same element that have A) different atomic numbers. B) the same atomic numbers but different numbers of protons. C) the same atomic numbers but different numbers of electrons. D) the same atomic number but different numbers of neutrons. E) the same atomic mass but diff ...
Part I - American Chemical Society
... A periodic table and other useful information are provided on page 2 for student reference. Students should be permitted to use nonprogrammable calculators. DIRECTIONS TO THE EXAMINEE–PART I DO NOT TURN THE PAGE UNTIL DIRECTED TO DO SO. Answers to questions in Part I must be entered on a Scantron an ...
... A periodic table and other useful information are provided on page 2 for student reference. Students should be permitted to use nonprogrammable calculators. DIRECTIONS TO THE EXAMINEE–PART I DO NOT TURN THE PAGE UNTIL DIRECTED TO DO SO. Answers to questions in Part I must be entered on a Scantron an ...
Chapter 8
... 3. When a nonmetal oxide reacts with water, it will produce an Acid. (Start with the H and end with the O) Example: Sulfur dioxide gas reacts with water 4. When a metal oxide reacts with water, it will produce a Base. (start with the metal and end with hydroxide, OH-) Example: Sodium oxide reacts wi ...
... 3. When a nonmetal oxide reacts with water, it will produce an Acid. (Start with the H and end with the O) Example: Sulfur dioxide gas reacts with water 4. When a metal oxide reacts with water, it will produce a Base. (start with the metal and end with hydroxide, OH-) Example: Sodium oxide reacts wi ...
Acids and Bases Unit
... This is a guessing question so be prepared for different responses. Most likely, that the light bulb will light up After testing the conductivity of the strong acid and before testing the weak acid in solution: o Did anything happen to the light bulb? Is that what we expected? If done correct ...
... This is a guessing question so be prepared for different responses. Most likely, that the light bulb will light up After testing the conductivity of the strong acid and before testing the weak acid in solution: o Did anything happen to the light bulb? Is that what we expected? If done correct ...
Major 1 Term 101 - KFUPM Faculty List
... That does not exist, only HS-, the hydrogen sulfide ion exists. B) HSO4 That does not exist, only HSO4-, the hydrogen sulfate ion exists. C) H2S That is either hydrogen sulfide when in gas phase, or hydrosulfuric acid when in aqueous solution. D) H2SO3 Correct: the acid related to sulfite ion, SO32- ...
... That does not exist, only HS-, the hydrogen sulfide ion exists. B) HSO4 That does not exist, only HSO4-, the hydrogen sulfate ion exists. C) H2S That is either hydrogen sulfide when in gas phase, or hydrosulfuric acid when in aqueous solution. D) H2SO3 Correct: the acid related to sulfite ion, SO32- ...
X012/11/02
... (ii) Strontium chloride hexahydrate can be used in toothpaste for sensitive teeth as it plugs the holes in the tooth enamel. This is possible because strontium has similar chemical properties to calcium. Why does strontium have similar chemical properties to calcium? ...
... (ii) Strontium chloride hexahydrate can be used in toothpaste for sensitive teeth as it plugs the holes in the tooth enamel. This is possible because strontium has similar chemical properties to calcium. Why does strontium have similar chemical properties to calcium? ...
Assistant Professor Chemistry, Class-2, Advt No. 84/2016
... of the electrolyte at the dilution v, the degree of dissociation (α) is given by (A) λ¥ / λv ...
... of the electrolyte at the dilution v, the degree of dissociation (α) is given by (A) λ¥ / λv ...
Acidic Environment
... Ternary acids commonly contain hydrogen, a nonmetal, and oxygen. The name of the most common form of the acid consists of the nonmetal root name with the -ic ending, The acid containing one less oxygen atom than the most common form is designated by the -ous ending. An acid containing one less oxyge ...
... Ternary acids commonly contain hydrogen, a nonmetal, and oxygen. The name of the most common form of the acid consists of the nonmetal root name with the -ic ending, The acid containing one less oxygen atom than the most common form is designated by the -ous ending. An acid containing one less oxyge ...
AP Chemistry - Forsyth County Schools
... nitrous acid cesium perchlorate H2SO4 HClO SF6 SnO2 ammonia carbon tetraiodide dipohosphorus pentoxide ammonium sulfite Al2(SO3)3 bromous acid ...
... nitrous acid cesium perchlorate H2SO4 HClO SF6 SnO2 ammonia carbon tetraiodide dipohosphorus pentoxide ammonium sulfite Al2(SO3)3 bromous acid ...
Acids, Bases and Salts
... the Brønsted-Lowry theory is an acid-base theory, proposed independently by Danish Johannes Nicolaus Brønsted and English Thomas Martin Lowry in 1923. In this system, an acid is defined as any chemical species (molecule or ion) that is able to lose, or "donate" a hydrogen ion (proton), and a base is ...
... the Brønsted-Lowry theory is an acid-base theory, proposed independently by Danish Johannes Nicolaus Brønsted and English Thomas Martin Lowry in 1923. In this system, an acid is defined as any chemical species (molecule or ion) that is able to lose, or "donate" a hydrogen ion (proton), and a base is ...
View Article - Asian Journal of Chemistry
... sodium hydroxide solution. Liquid bromine ( 4.2 mL, 80 mmol) was added dropwise in 2 h when the mixture maintained at 100 - 130 ºC heated by oil bath, excess time was prolonged for reaction until the colour of the reaction mixture turned to light yellow, after that the oil bath was removed and ethyl ...
... sodium hydroxide solution. Liquid bromine ( 4.2 mL, 80 mmol) was added dropwise in 2 h when the mixture maintained at 100 - 130 ºC heated by oil bath, excess time was prolonged for reaction until the colour of the reaction mixture turned to light yellow, after that the oil bath was removed and ethyl ...
Fe(H2O)63+ + H2O → ← H3O+ + Fe(H2O)5(OH)2+
... 1. According to the Brønsted–Lowry definition, bases, when reacting with acids (A) (B) (C) (D) (E) ...
... 1. According to the Brønsted–Lowry definition, bases, when reacting with acids (A) (B) (C) (D) (E) ...
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.