the optimization of proton exchange membrane hydrogen fuel cells
... reactions at the anode and cathode [9]. The hydrogen oxidation has only one possible mechanism and therefore the selectivity does not affect the anode [9]. There are two possible mechanisms at the cathode for the oxygen reduction and the pathway taken is determined by the selectivity of the catalyst ...
... reactions at the anode and cathode [9]. The hydrogen oxidation has only one possible mechanism and therefore the selectivity does not affect the anode [9]. There are two possible mechanisms at the cathode for the oxygen reduction and the pathway taken is determined by the selectivity of the catalyst ...
Chemistry of Cars unit_7_chemistry_of_cars
... The Reduction Catalyst: The reduction catalyst is the first stage of the catalytic converter. It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxyge ...
... The Reduction Catalyst: The reduction catalyst is the first stage of the catalytic converter. It uses platinum and rhodium to help reduce the NOx emissions. When an NO or NO2 molecule contacts the catalyst, the catalyst rips the nitrogen atom out of the molecule and holds on to it, freeing the oxyge ...
Keq Assignment
... Pay close attention to the physical states! NOTES: You must include the charge when writing ions, otherwise your answer is incorrect. Do not balance these equations using fractions for coefficients. a) sulfur dioxide gas combines with oxygen gas to produce sulfur trioxide gas ...
... Pay close attention to the physical states! NOTES: You must include the charge when writing ions, otherwise your answer is incorrect. Do not balance these equations using fractions for coefficients. a) sulfur dioxide gas combines with oxygen gas to produce sulfur trioxide gas ...
chapter 1 - College Test bank - get test bank and solution manual
... liquid gasoline is converted to heat and gases. Another constructive example is the burning of coal to heat water into steam, which is then used to turn a turbine and produce electricity. The combustion of coal results in a flame plus other gases. The above two examples are examples of chemical chan ...
... liquid gasoline is converted to heat and gases. Another constructive example is the burning of coal to heat water into steam, which is then used to turn a turbine and produce electricity. The combustion of coal results in a flame plus other gases. The above two examples are examples of chemical chan ...
Chemistry - Edexcel
... t Use in the boxes at the top of this page with your name, t Fill centre number and candidate number. all questions. t Answer the questions in the spaces provided t Answer – there may be more space than you need. Show all the steps in any calculations and state the units. t Some questions must be an ...
... t Use in the boxes at the top of this page with your name, t Fill centre number and candidate number. all questions. t Answer the questions in the spaces provided t Answer – there may be more space than you need. Show all the steps in any calculations and state the units. t Some questions must be an ...
std 8 9 reviewanswers
... C A catalyst works by lowering the activation energy for the reaction 9. Chemical equilibrium is a dynamic process at the molecular level. As a basis for understanding this concept: a. Students know how to use Le Chatelier’s principle to predict the effect of changes in concentration, temperature, a ...
... C A catalyst works by lowering the activation energy for the reaction 9. Chemical equilibrium is a dynamic process at the molecular level. As a basis for understanding this concept: a. Students know how to use Le Chatelier’s principle to predict the effect of changes in concentration, temperature, a ...
Introduction to Organic Chemistry Curriculum
... ended. Sometimes, EQs can be debated. A student’s answer to an EQ will help teachers determine if he/she truly understands. Consider having only one or two EQs per Enduring Understanding.) ...
... ended. Sometimes, EQs can be debated. A student’s answer to an EQ will help teachers determine if he/she truly understands. Consider having only one or two EQs per Enduring Understanding.) ...
An Efficient Oxidation of Benzoins to Benzils by Manganese (II
... is surrounded by O- or N-donor ligands [13, 14]. In addition, they also act as catalysts for important reactions [15–20]. e development of manganese(II) Schiff base heterogeneous catalysts for oxidation reaction has become a major area of research recently [21–23], as the potential advantages of the ...
... is surrounded by O- or N-donor ligands [13, 14]. In addition, they also act as catalysts for important reactions [15–20]. e development of manganese(II) Schiff base heterogeneous catalysts for oxidation reaction has become a major area of research recently [21–23], as the potential advantages of the ...
PHYSICAL CHEMISTRY ERT 108 Semester II 2010
... - Reactions where some of the species are gases (ex: combustion rxn) – studied in a constant-volume calorimeter - Reactions not involving gases – studied in a constantpressure calorimeter. ...
... - Reactions where some of the species are gases (ex: combustion rxn) – studied in a constant-volume calorimeter - Reactions not involving gases – studied in a constantpressure calorimeter. ...
Kinetics of a Reaction
... 1.4 The student is able to connect the number of particles, moles, mass, and volume of substances to one another, both qualitatively and quantitatively. 4.1 The student is able to design and/or interpret the results of an experiment regarding the factors (i.e., temperature, concentration, surface ...
... 1.4 The student is able to connect the number of particles, moles, mass, and volume of substances to one another, both qualitatively and quantitatively. 4.1 The student is able to design and/or interpret the results of an experiment regarding the factors (i.e., temperature, concentration, surface ...
Bifunctional Asymmetric Catalysis: Cooperative Lewis Acid/Base
... Bifunctional Asymmetric Catalysis Paull et al. ...
... Bifunctional Asymmetric Catalysis Paull et al. ...
Science24-UnitA-Section3.1-3.2
... ______________________________________________________________________________________ 3. Describe, in words, the general form of a simple composition reaction. ____________________________________________________________________________________________ 4. Write the general form of a simple composi ...
... ______________________________________________________________________________________ 3. Describe, in words, the general form of a simple composition reaction. ____________________________________________________________________________________________ 4. Write the general form of a simple composi ...
Oxidation of benzoin with anchored vanadyl and
... same ligands. One reason for this could be the Lewis acidity and on this basis the molybdenum(V1) complexes are expected to be better catalysts than vanadium(V) complexes having the same ligands. Besides, the higher catalytic activity of the molybdenum complexes as compared to the corresponding vana ...
... same ligands. One reason for this could be the Lewis acidity and on this basis the molybdenum(V1) complexes are expected to be better catalysts than vanadium(V) complexes having the same ligands. Besides, the higher catalytic activity of the molybdenum complexes as compared to the corresponding vana ...
9.1-10.5 Organic Chemistry
... Write the complete IUPAC name, following the format: (number of location, if necessary) – (branch name) (parent chain) ...
... Write the complete IUPAC name, following the format: (number of location, if necessary) – (branch name) (parent chain) ...
File - Mr Weng`s IB Chemistry
... • Homogeneous catalysts chemically combine with the reactants to form a temporary activated complex or a reaction intermediate. • Transition metal catalytic properties depend on the adsorption/absorption properties of the metal and the variable oxidation states. • Zeolites act as selective catalysts ...
... • Homogeneous catalysts chemically combine with the reactants to form a temporary activated complex or a reaction intermediate. • Transition metal catalytic properties depend on the adsorption/absorption properties of the metal and the variable oxidation states. • Zeolites act as selective catalysts ...
Balancing Chemical Equations Activity by Liz LaRosa www
... The index cards are a bit time consuming to create. I had some students help at lunch time for a few days. Once done, you can laminate them and have them forever! The materials account for one complete set which is good for 2-3 students to use. Print activity cards on card stock instead of making in ...
... The index cards are a bit time consuming to create. I had some students help at lunch time for a few days. Once done, you can laminate them and have them forever! The materials account for one complete set which is good for 2-3 students to use. Print activity cards on card stock instead of making in ...
Supporting Information – A review of methane mitigation
... of Delaware. The largest cooling towers have outlet areas of 2000–3000 m2 . More than a million such towers would be required. When compared with atmospheric CO2 capture, methane is much more difficult owing to both its lower concentration and shorter atmospheric lifetime. ...
... of Delaware. The largest cooling towers have outlet areas of 2000–3000 m2 . More than a million such towers would be required. When compared with atmospheric CO2 capture, methane is much more difficult owing to both its lower concentration and shorter atmospheric lifetime. ...
Practice problem chap3 1. The atomic mass of 35Cl (75.53%) and
... Practice problem chap3 1. The atomic mass of Cl (75.53%) and 37Cl (24.47%) are 34.968amu and 36.956amu.Calculate the average atomic mass in amu. 2. What is the mass percent (%) for O in SO2? (a) 38.09 (b) 45.41 (c) 50.00 (d) 53.86 (e) 56.43 3. How many molecules of ethane (C2H6) are present in 0.334 ...
... Practice problem chap3 1. The atomic mass of Cl (75.53%) and 37Cl (24.47%) are 34.968amu and 36.956amu.Calculate the average atomic mass in amu. 2. What is the mass percent (%) for O in SO2? (a) 38.09 (b) 45.41 (c) 50.00 (d) 53.86 (e) 56.43 3. How many molecules of ethane (C2H6) are present in 0.334 ...
AP CHEMISTRY PROBLEMS ENTHALPY, ENTROPY, AND FREE
... 13. For the reaction 2NO2 (g) ⇆N2O4 (g) , the values of ΔH° and ΔS° are -58.03 kJ and -176.6 J/K respectively. What is the value of ΔG° at 298 K? Assuming that ΔH° and ΔS° do not depend on temperature, at what temperature is ΔG°=O? Is ΔG° negative above or below this ...
... 13. For the reaction 2NO2 (g) ⇆N2O4 (g) , the values of ΔH° and ΔS° are -58.03 kJ and -176.6 J/K respectively. What is the value of ΔG° at 298 K? Assuming that ΔH° and ΔS° do not depend on temperature, at what temperature is ΔG°=O? Is ΔG° negative above or below this ...
158KB - NZQA
... In Experiment 2, the only change is an increase in temperature. An increase in temperature means an increase in the rate of reaction. Increased temperature increases the speed of movement of the particles, and thus increases the frequency of collisions. Increased temperature also increases the kinet ...
... In Experiment 2, the only change is an increase in temperature. An increase in temperature means an increase in the rate of reaction. Increased temperature increases the speed of movement of the particles, and thus increases the frequency of collisions. Increased temperature also increases the kinet ...
Catalytic reforming
Catalytic reforming is a chemical process used to convert petroleum refinery naphthas distilled from crude oil (typically having low octane ratings) into high-octane liquid products called reformates, which are premium blending stocks for high-octane gasoline. The process converts low-octane linear hydrocarbons (paraffins) into branched alkanes (isoparaffins) and cyclic naphthenes, which are then partially dehydrogenated to produce high-octane aromatic hydrocarbons. The dehydrogenation also produces significant amounts of byproduct hydrogen gas, which is fed into other refinery processes such as hydrocracking. A side reaction is hydrogenolysis, which produces light hydrocarbons of lower value, such as methane, ethane, propane and butanes.In addition to a gasoline blending stock, reformate is the main source of aromatic bulk chemicals such as benzene, toluene, xylene and ethylbenzene which have diverse uses, most importantly as raw materials for conversion into plastics. However, the benzene content of reformate makes it carcinogenic, which has led to governmental regulations effectively requiring further processing to reduce its benzene content.This process is quite different from and not to be confused with the catalytic steam reforming process used industrially to produce products such as hydrogen, ammonia, and methanol from natural gas, naphtha or other petroleum-derived feedstocks. Nor is this process to be confused with various other catalytic reforming processes that use methanol or biomass-derived feedstocks to produce hydrogen for fuel cells or other uses.