Example: Writing a Thermochemical Equation
... Doubling of the previous equation, you obtain 2N2(g) + 6H2(g) → 4NH3(g); ∆H = -184 kJ Suppose we reverse the first equation we wrote for the synthesis of ammonia. Then the reaction is for the dissociation of two mol of ammonia into its elements. The thermochemical equation is 2NH3(g) → N2(g) + 3H2(g ...
... Doubling of the previous equation, you obtain 2N2(g) + 6H2(g) → 4NH3(g); ∆H = -184 kJ Suppose we reverse the first equation we wrote for the synthesis of ammonia. Then the reaction is for the dissociation of two mol of ammonia into its elements. The thermochemical equation is 2NH3(g) → N2(g) + 3H2(g ...
June review January 2012 part A
... •Q 39 is a gas law problem; note that temperature does not change (Items 63-8) and that the answers are reported to only two significant figures ...
... •Q 39 is a gas law problem; note that temperature does not change (Items 63-8) and that the answers are reported to only two significant figures ...
Part-1
... Solutions having equal molar concentration and equal osmotic pressure at a given temperature are called isotonic solutions, e.g., A 0.90% (mass/volume) solution of NaCl is isotonic with human RBC. A solution of NaCl with concentration less than 0.90% (mass/volume) is hypotonic and RBC will swells up ...
... Solutions having equal molar concentration and equal osmotic pressure at a given temperature are called isotonic solutions, e.g., A 0.90% (mass/volume) solution of NaCl is isotonic with human RBC. A solution of NaCl with concentration less than 0.90% (mass/volume) is hypotonic and RBC will swells up ...
Matter - tompkinsmath
... a) Elements – substances composed of only one kind of atom which cannot be broken down using heat or electricity. Ex. Na, Br, O2, S8 b) Compounds – substances composed of 2 or more kinds of atoms and can be decomposed using heat or electricity. Ex. H2O, NaCl, C12H22O11 Mixtures – mixtures of pure su ...
... a) Elements – substances composed of only one kind of atom which cannot be broken down using heat or electricity. Ex. Na, Br, O2, S8 b) Compounds – substances composed of 2 or more kinds of atoms and can be decomposed using heat or electricity. Ex. H2O, NaCl, C12H22O11 Mixtures – mixtures of pure su ...
Chapter 4 Aqueous Reactions and Solution Stoichiometry
... Separate the reactions into oxidation and reduction processes Work with one (ox or red) first Balance number of non-oxygen, non-hydrogen atoms first. Then balance oxygen with water Then balance hydrogen with H+ Then balance charge with electrons. Then balance other half-reaction using steps 3 throug ...
... Separate the reactions into oxidation and reduction processes Work with one (ox or red) first Balance number of non-oxygen, non-hydrogen atoms first. Then balance oxygen with water Then balance hydrogen with H+ Then balance charge with electrons. Then balance other half-reaction using steps 3 throug ...
IGCSE SoW 2013
... Describe simple tests for the anions: • Cl-, Br- and I-, using dilute nitric acid and silver nitrate solution • SO42-, using dilute hydrochloric acid and barium chloride solution • CO32-, using dilute hydrochloric acid and identifying the carbon dioxide evolved ...
... Describe simple tests for the anions: • Cl-, Br- and I-, using dilute nitric acid and silver nitrate solution • SO42-, using dilute hydrochloric acid and barium chloride solution • CO32-, using dilute hydrochloric acid and identifying the carbon dioxide evolved ...
Thermodynamic Properties of Hydrated and Ammoniated Electrons
... temperature coefficient of AG,",,,- and the corresponding positive values of So,,,- are mostly due to what happens to solvent molecules when they are transferred from the bulk of the solvent to the first solvation layer. The new solvent arrangement in the first coordination layer is looser than in t ...
... temperature coefficient of AG,",,,- and the corresponding positive values of So,,,- are mostly due to what happens to solvent molecules when they are transferred from the bulk of the solvent to the first solvation layer. The new solvent arrangement in the first coordination layer is looser than in t ...
Chapters 14 and 15 Outline
... pH meter – is a device that determines the pH of a solution by measuring the voltage between the two electrodes that are in the solution. Titration – is a controlled addition and measurement of the amount of a solution of known concentration required to react completely with a measure of a solution ...
... pH meter – is a device that determines the pH of a solution by measuring the voltage between the two electrodes that are in the solution. Titration – is a controlled addition and measurement of the amount of a solution of known concentration required to react completely with a measure of a solution ...
Chapter 9: Chemical Bonding I: Lewis Theory
... i) Metals lose electrons to form cations while nonmetals gain electrons to form anions. C) Ion pair is more stable than separated ions. D) Found as a 3-D crystal lattices containing alternating cations & anions. 2) Covalent Bonding A) Covalent Bonding results from sharing valence electrons. B) Occur ...
... i) Metals lose electrons to form cations while nonmetals gain electrons to form anions. C) Ion pair is more stable than separated ions. D) Found as a 3-D crystal lattices containing alternating cations & anions. 2) Covalent Bonding A) Covalent Bonding results from sharing valence electrons. B) Occur ...
Chemistry 201 - Department of Chemistry | Oregon State University
... This exam consists of 25 multiple-choice questions. Each question has four points associated with it. Select the best multiple-choice answer by filling in the corresponding circle on the rear page of the answer sheet. If you have any questions before the exam, please ask. If you have any questions d ...
... This exam consists of 25 multiple-choice questions. Each question has four points associated with it. Select the best multiple-choice answer by filling in the corresponding circle on the rear page of the answer sheet. If you have any questions before the exam, please ask. If you have any questions d ...
1999 Advanced Placement Chemistry Exam
... 26. When the equation above is balanced and all (B) The oxidation number of H changes from -1 coefficients are reduced to their lowest wholeto +1. number terms, the coefficient for O2(g) is (C) The (A) 6 (B) ...
... 26. When the equation above is balanced and all (B) The oxidation number of H changes from -1 coefficients are reduced to their lowest wholeto +1. number terms, the coefficient for O2(g) is (C) The (A) 6 (B) ...
ST. PAUL`S CONVENT SCHOOL METALLIC RAINBOW 金屬彩虹
... In part I, NH3, en, citrate and glycine were chosen for Cu2+ for the conduction of colorimetry; EDTA, oxalate and tartrate for Ni2+; conc. HCl, en and tartrate for Co2+; NaBr, EDTA and leucine for Cr3+; KSCN, rust indicator, en, citrate and glycine for Fe3+. In part II, en and glycine were selec ...
... In part I, NH3, en, citrate and glycine were chosen for Cu2+ for the conduction of colorimetry; EDTA, oxalate and tartrate for Ni2+; conc. HCl, en and tartrate for Co2+; NaBr, EDTA and leucine for Cr3+; KSCN, rust indicator, en, citrate and glycine for Fe3+. In part II, en and glycine were selec ...
File - Get Involved!
... – When 2 or more reactants combine to form one product – Exothermic reaction S (s) + O2 (g) SO2 (g) 2. Decomposition Reaction – When a reactant decomposes into two or more products (at least one gas) – Endothermic reaction ...
... – When 2 or more reactants combine to form one product – Exothermic reaction S (s) + O2 (g) SO2 (g) 2. Decomposition Reaction – When a reactant decomposes into two or more products (at least one gas) – Endothermic reaction ...
Thermochem problems
... Yes, because it is just another elemental form of oxygen. No, because it is not the most stable form of the element oxygen at the given conditions. Yes, because changing the subscripts of an elemental formula does not change standard enthalpy of formation. No, because there is a temperature change w ...
... Yes, because it is just another elemental form of oxygen. No, because it is not the most stable form of the element oxygen at the given conditions. Yes, because changing the subscripts of an elemental formula does not change standard enthalpy of formation. No, because there is a temperature change w ...
AP `99 Multiple Choice
... 26. When the equation above is balanced and all (B) The oxidation number of H changes from -1 coefficients are reduced to their lowest wholeto +1. number terms, the coefficient for O2(g) is (C) The (A) 6 (B) ...
... 26. When the equation above is balanced and all (B) The oxidation number of H changes from -1 coefficients are reduced to their lowest wholeto +1. number terms, the coefficient for O2(g) is (C) The (A) 6 (B) ...
Chapter 18 – Electric Potential and Capacitance
... be removed from the circuit and the capacitor will remain charged as long as it is not connected to a conductor. • Once the plates are connected to a conductor, the capacitor will discharge – the charges move back from one plate to the other until there is zero potential difference between them • Th ...
... be removed from the circuit and the capacitor will remain charged as long as it is not connected to a conductor. • Once the plates are connected to a conductor, the capacitor will discharge – the charges move back from one plate to the other until there is zero potential difference between them • Th ...
Slide 1
... Difference •Relation between Electric Potential and Electric Field •Equipotential Lines •The Electron Volt, a Unit of Energy •Electric Potential Due to Point Charges •Potential Due to Electric Dipole; Dipole ...
... Difference •Relation between Electric Potential and Electric Field •Equipotential Lines •The Electron Volt, a Unit of Energy •Electric Potential Due to Point Charges •Potential Due to Electric Dipole; Dipole ...
111 Exam I F 04 use
... Tear off this top page (pg. 1)-It is your scratch paper The following are molar masses you may or may not need: H2O = 18.02 ...
... Tear off this top page (pg. 1)-It is your scratch paper The following are molar masses you may or may not need: H2O = 18.02 ...
Syllabus - Chemistry
... Magnetic Properties and Electronic Spectra of Transition Metal Complexes Types of magnetic behaviour, magnetic susceptibility and magnetic moment; methods of determining magnetic susceptibility; spin-only formula; L-S coupling, correlation of |^s and i^ff values; orbital contribution to magnetic mom ...
... Magnetic Properties and Electronic Spectra of Transition Metal Complexes Types of magnetic behaviour, magnetic susceptibility and magnetic moment; methods of determining magnetic susceptibility; spin-only formula; L-S coupling, correlation of |^s and i^ff values; orbital contribution to magnetic mom ...
Electrochemistry
Electrochemistry is the branch of physical chemistry that studies chemical reactions which take place at the interface of an electrode, usually a solid metal or a semiconductor, and an ionic conductor, the electrolyte. These reactions involve electric charges moving between the electrodes and the electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change.When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit and an intervening electrolyte.