Question 1 - JustAnswer
... reaction that occurs for a Bunsen burner, which is a source of heat for chemical reactions in the laboratory. CH4(g) + 2O2(g) CO2(g) + 2H2O(g) For the system at chemical equilibrium, which of the following explains what happens if the temperature is raised? Answer The equilibrium position is shifted ...
... reaction that occurs for a Bunsen burner, which is a source of heat for chemical reactions in the laboratory. CH4(g) + 2O2(g) CO2(g) + 2H2O(g) For the system at chemical equilibrium, which of the following explains what happens if the temperature is raised? Answer The equilibrium position is shifted ...
Molecular Formulas - Hatboro
... To the AP Chemistry Student: Welcome to my AP Chemistry class! The Advance Placement Chemistry experience is designed to provide a full year of college-level chemistry, so it places heavy demands on the student, especially in terms of the time commitment required. In fact, the College Board suggests ...
... To the AP Chemistry Student: Welcome to my AP Chemistry class! The Advance Placement Chemistry experience is designed to provide a full year of college-level chemistry, so it places heavy demands on the student, especially in terms of the time commitment required. In fact, the College Board suggests ...
periodic table - Mesa Community College
... must first learn the alphabet if it is different from that of our native tongue. Similarly, before you can learn chemistry, you must become familiar with the names and symbols of the "basic building blocks of matter", the elements. Elements are pure substances that can't be broken down to simpler pu ...
... must first learn the alphabet if it is different from that of our native tongue. Similarly, before you can learn chemistry, you must become familiar with the names and symbols of the "basic building blocks of matter", the elements. Elements are pure substances that can't be broken down to simpler pu ...
KEY + + - UIC Department of Chemistry
... Not possible to form 1.80 g N2. Can't make more N2 than the theoretical yield. ...
... Not possible to form 1.80 g N2. Can't make more N2 than the theoretical yield. ...
Comparison of homogeneous and heterogeneous catalysis
... mg KOH/g which is still above the safe limit for transesterification reaction (i.e., 4.0 mg KOH/g). Lower temperature could not reduce the FFA to less than 2.0% and temperature higher than 55±0.5 °C showed no further reduction in FFA. 1.0 h of reaction time was optimum for the reduction of acid valu ...
... mg KOH/g which is still above the safe limit for transesterification reaction (i.e., 4.0 mg KOH/g). Lower temperature could not reduce the FFA to less than 2.0% and temperature higher than 55±0.5 °C showed no further reduction in FFA. 1.0 h of reaction time was optimum for the reduction of acid valu ...
Chemistry of the Non
... We divide the periodic table into metals, nonmetals and metalloids. Nonmetals occupy the upper right portion of the periodic table. • H is a special case. Electronegativity is important when determining whether an element is a metal. Nonmetals tend to have higher electronegativities than metals. • T ...
... We divide the periodic table into metals, nonmetals and metalloids. Nonmetals occupy the upper right portion of the periodic table. • H is a special case. Electronegativity is important when determining whether an element is a metal. Nonmetals tend to have higher electronegativities than metals. • T ...
Summer Assignment
... AP Chemistry is a difficult course. It is not all about memorization; however, having these items memorized is essential for success in learning the concepts covered in the course. Make flashcards, have your friends and family quiz you, take the lists with you on vacation, or do whatever it takes to ...
... AP Chemistry is a difficult course. It is not all about memorization; however, having these items memorized is essential for success in learning the concepts covered in the course. Make flashcards, have your friends and family quiz you, take the lists with you on vacation, or do whatever it takes to ...
Thermochemistry
... Standard Enthalpies of Formation ∆Hfo values can be used to calculate the standard enthalpy changes for many reactions. In an application of Hess’s Law, it is as if the reactants are decomposed into their elements, and then the elements are recombined into the desired products. Since enthalpies of ...
... Standard Enthalpies of Formation ∆Hfo values can be used to calculate the standard enthalpy changes for many reactions. In an application of Hess’s Law, it is as if the reactants are decomposed into their elements, and then the elements are recombined into the desired products. Since enthalpies of ...
Document
... • respiration: the process by which living organisms use O2 to oxidize carbon-containing compounds to produce CO2 and H2O. The importance of these reaction is not the CO2 produced, but the energy released. • rusting: the oxidation of iron to a mixture of iron oxides ...
... • respiration: the process by which living organisms use O2 to oxidize carbon-containing compounds to produce CO2 and H2O. The importance of these reaction is not the CO2 produced, but the energy released. • rusting: the oxidation of iron to a mixture of iron oxides ...
Document
... ΔH = – 483.6 kJ Characteristics of Enthalpy (1) Enthalpy is an extensive property (2) ΔH for a reaction is equal in magnitude but opposite in sign to ΔH for reverse reaction (3) ΔH for a reaction depends on states of reactants and products (gas, liquid) ...
... ΔH = – 483.6 kJ Characteristics of Enthalpy (1) Enthalpy is an extensive property (2) ΔH for a reaction is equal in magnitude but opposite in sign to ΔH for reverse reaction (3) ΔH for a reaction depends on states of reactants and products (gas, liquid) ...
2013 Chemistry examination report
... Options B, C and D were all inconsistent with the conditions for hydrogen bonding. Reduction and oxidation can both be defined in terms of the transfer of oxygen, hydrogen and electrons as well as changes in oxidation number. Reduction is defined as gain of electrons decrease in oxidation number ...
... Options B, C and D were all inconsistent with the conditions for hydrogen bonding. Reduction and oxidation can both be defined in terms of the transfer of oxygen, hydrogen and electrons as well as changes in oxidation number. Reduction is defined as gain of electrons decrease in oxidation number ...
Honors Chemistry
... Internet Research LaserDisc PowerPoint IBooks CBL units Loggerpro Software VCR DVD SmartBoard ...
... Internet Research LaserDisc PowerPoint IBooks CBL units Loggerpro Software VCR DVD SmartBoard ...
Honors Chemistry Curr
... Internet Research LaserDisc PowerPoint IBooks CBL units Loggerpro Software VCR DVD SmartBoard ...
... Internet Research LaserDisc PowerPoint IBooks CBL units Loggerpro Software VCR DVD SmartBoard ...
Chapter 1
... a) rice pudding Heterogeneous mixture b) seawater Homogeneous mixture unless there are undissolved particles such as sand, then heterogeneous c) magnesium Element d) gasoline Homogeneous mixture ...
... a) rice pudding Heterogeneous mixture b) seawater Homogeneous mixture unless there are undissolved particles such as sand, then heterogeneous c) magnesium Element d) gasoline Homogeneous mixture ...
answers to part a of the national high school
... The more general form of the fire traingle is needed because there are all sorts of other oxidants apart from oxygen that substances can burn in, e.g. chlorine or nitrogen dioxide. Solid substances such as nitrates or chlorates are also considered to be oxidising substances because they can release ...
... The more general form of the fire traingle is needed because there are all sorts of other oxidants apart from oxygen that substances can burn in, e.g. chlorine or nitrogen dioxide. Solid substances such as nitrates or chlorates are also considered to be oxidising substances because they can release ...
Energy Practice
... H2SO4(aq) is added. The initial temperature of the acid and the base before they are combined is 25.0°C. Once the reaction has come to completion the highest temperature reached is 28°C. a. Calculate the volume of sulfuric acid needed to perfectly neutralize the potassium hydroxide solution. (Hint: ...
... H2SO4(aq) is added. The initial temperature of the acid and the base before they are combined is 25.0°C. Once the reaction has come to completion the highest temperature reached is 28°C. a. Calculate the volume of sulfuric acid needed to perfectly neutralize the potassium hydroxide solution. (Hint: ...
1 Chemical Reactions and Equations
... This is a balanced chemical equation but it does not give the following information: (i) The physical state of the reactants and products whether these are solids, liquids or gaseous etc. (ii) Concentration of reactants and products. (iii) Condition of reaction such as temperature, pressure, catalys ...
... This is a balanced chemical equation but it does not give the following information: (i) The physical state of the reactants and products whether these are solids, liquids or gaseous etc. (ii) Concentration of reactants and products. (iii) Condition of reaction such as temperature, pressure, catalys ...
Chemical Equilibrium - Chemistry Teaching Resources
... The strong base will have dissociated completely meaning that all the OH—(aq) ions were available to react with the Fe3+(aq) ions . The weak base is only partially dissociated so less than 1% of the OH—(aq) ions are available at the beginning. However, as the OH—(aq) ions react with Fe3+(aq) they ...
... The strong base will have dissociated completely meaning that all the OH—(aq) ions were available to react with the Fe3+(aq) ions . The weak base is only partially dissociated so less than 1% of the OH—(aq) ions are available at the beginning. However, as the OH—(aq) ions react with Fe3+(aq) they ...
Ordinary Level - State Examination Commission
... Electronegativity values (page 81 of the Formulae and Tables booklet) are used to predict polarity of a covalent bond. Classify the bonding in ammonia (NH3) as pure covalent or polar covalent. Give a reason why the boiling point of ammonia (–33 ºC) is much higher than the boiling point of fluorine ( ...
... Electronegativity values (page 81 of the Formulae and Tables booklet) are used to predict polarity of a covalent bond. Classify the bonding in ammonia (NH3) as pure covalent or polar covalent. Give a reason why the boiling point of ammonia (–33 ºC) is much higher than the boiling point of fluorine ( ...
Structured questions
... A student tried to investigate the pH value of rainwater collected in an area with an incinerator and a lot of factories. a) Could he use methyl orange to measure the pH value of rainwater? Explain briefly. b) Name a device he can use to measure the pH value of rainwater accurately. c) He found that ...
... A student tried to investigate the pH value of rainwater collected in an area with an incinerator and a lot of factories. a) Could he use methyl orange to measure the pH value of rainwater? Explain briefly. b) Name a device he can use to measure the pH value of rainwater accurately. c) He found that ...
Introductory Chemistry I
... 4. The maximum number of electrons that can occupy the 3d orbitals is a. 5 b. 6 c. 10 d. 14 e. 18 5. Let’s say that you are examining the outermost electrons in a ground-state germanium atom. Which of the following sets of values for the four quantum numbers (n, l, ml, and ms) could you use to descr ...
... 4. The maximum number of electrons that can occupy the 3d orbitals is a. 5 b. 6 c. 10 d. 14 e. 18 5. Let’s say that you are examining the outermost electrons in a ground-state germanium atom. Which of the following sets of values for the four quantum numbers (n, l, ml, and ms) could you use to descr ...
Lewis acid catalysis
In Lewis acid catalysis of organic reactions, a metal-based Lewis acid acts as an electron pair acceptor to increase the reactivity of a substrate. Common Lewis acid catalysts are based on main group metals such as aluminum, boron, silicon, and tin, as well as many early (titanium, zirconium) and late (iron, copper, zinc) d-block metals. The metal atom forms an adduct with a lone-pair bearing electronegative atom in the substrate, such as oxygen (both sp2 or sp3), nitrogen, sulfur, and halogens. The complexation has partial charge-transfer character and makes the lone-pair donor effectively more electronegative, activating the substrate toward nucleophilic attack, heterolytic bond cleavage, or cycloaddition with 1,3-dienes and 1,3-dipoles.Many classical reactions involving carbon–carbon or carbon–heteroatom bond formation can be catalyzed by Lewis acids. Examples include the Friedel-Crafts reaction, the aldol reaction, and various pericyclic processes that proceed slowly at room temperature, such as the Diels-Alder reaction and the ene reaction. In addition to accelerating the reactions, Lewis acid catalysts are able to impose regioselectivity and stereoselectivity in many cases.Early developments in Lewis acid reagents focused on easily available compounds such as TiCl4, BF3, SnCl4, and AlCl3. The relative strengths of these (and other) Lewis acids may be estimated from NMR spectroscopy by the Childs method or the Gutmann-Beckett method. Over the years, versatile catalysts bearing ligands designed for specific applications have facilitated improvement in both reactivity and selectivity of Lewis acid-catalyzed reactions. More recently, Lewis acid catalysts with chiral ligands have become an important class of tools for asymmetric catalysis.Challenges in the development of Lewis acid catalysis include inefficient catalyst turnover (caused by catalyst affinity for the product) and the frequent requirement of two-point binding for stereoselectivity, which often necessitates the use of auxiliary groups.