Surface chemistry and Catalysis
... Here we are considering physical adsorption resulting in the multi layer adsorption. In BET it is assumed that the solid surface possesses uniform, localized sites and adsorption at one site does not affect adsorption at neighboring sites . It is further assumed that the molecule can be adsorbed in ...
... Here we are considering physical adsorption resulting in the multi layer adsorption. In BET it is assumed that the solid surface possesses uniform, localized sites and adsorption at one site does not affect adsorption at neighboring sites . It is further assumed that the molecule can be adsorbed in ...
Chemistry Standard Level Chapter 1
... of the drug. Food manufacturers check levels of purity. In the laboratory, reactants need to be mixed in the correct ratios to prepare the desired product. We measure mass and volume routinely in the lab but they are not direct measures of amount. Equal quantities of apples and oranges do not have e ...
... of the drug. Food manufacturers check levels of purity. In the laboratory, reactants need to be mixed in the correct ratios to prepare the desired product. We measure mass and volume routinely in the lab but they are not direct measures of amount. Equal quantities of apples and oranges do not have e ...
1 Quantitative chemistry - Pearson Schools and FE Colleges
... of the drug. Food manufacturers check levels of purity. In the laboratory, reactants need to be mixed in the correct ratios to prepare the desired product. We measure mass and volume routinely in the lab but they are not direct measures of amount. Equal quantities of apples and oranges do not have e ...
... of the drug. Food manufacturers check levels of purity. In the laboratory, reactants need to be mixed in the correct ratios to prepare the desired product. We measure mass and volume routinely in the lab but they are not direct measures of amount. Equal quantities of apples and oranges do not have e ...
1 3. Molecular mass transport 3.1 Introduction to mass transfer 3.2
... rate of processes accruing in liquids (such as reaction between two components in liquids). In chemistry, diffusivity limits the rate of acid-base reactions; in the chemical industry, diffusion is responsible for the rates of liquid-liquid extraction. Diffusion in liquids is important because it is ...
... rate of processes accruing in liquids (such as reaction between two components in liquids). In chemistry, diffusivity limits the rate of acid-base reactions; in the chemical industry, diffusion is responsible for the rates of liquid-liquid extraction. Diffusion in liquids is important because it is ...
AP Chemistry - Problem Drill 03: Matter and Energy Question No. 1
... Although temperature changes are often common in chemical changes, not all chemical changes result in a temperature change. Therefore, the lack of a significant temperature change is not proof that the change is physical. E. Incorrect! The dry ingredients do not disappear; they spread out when they ...
... Although temperature changes are often common in chemical changes, not all chemical changes result in a temperature change. Therefore, the lack of a significant temperature change is not proof that the change is physical. E. Incorrect! The dry ingredients do not disappear; they spread out when they ...
Topic 1 Quantitative Chemistry File
... Avogadro’s constant: The number of particles in 12g of 12C. Concentration: the amount of solute per unit of volume of solution Formula, empirical: The formula obtained by experiment, showing the simplest whole number ratio of atoms of each element in a particle of a substance. Formula, molecular: Th ...
... Avogadro’s constant: The number of particles in 12g of 12C. Concentration: the amount of solute per unit of volume of solution Formula, empirical: The formula obtained by experiment, showing the simplest whole number ratio of atoms of each element in a particle of a substance. Formula, molecular: Th ...
Physical Vapor Deposition
... Hertz-Knudsen expression must be used. • Effusion refers to evaporation through an orifice by which the area of the orifice appears as an evaporation source of the same area. • Free evaporation is isotropic. • Effusion is somewhat directional. – Ideally, it is a Lambertian angular distribution. ...
... Hertz-Knudsen expression must be used. • Effusion refers to evaporation through an orifice by which the area of the orifice appears as an evaporation source of the same area. • Free evaporation is isotropic. • Effusion is somewhat directional. – Ideally, it is a Lambertian angular distribution. ...
Standard - Santee Education Complex
... So what constitutes a chemical bond? A bond is formed when electrons from two atoms interact with each other and their atoms become joined. The electrons that interact with each other are VALENCE ELECTRONS, the ones that reside in the outermost electron shell of an atom. There are two main types of ...
... So what constitutes a chemical bond? A bond is formed when electrons from two atoms interact with each other and their atoms become joined. The electrons that interact with each other are VALENCE ELECTRONS, the ones that reside in the outermost electron shell of an atom. There are two main types of ...
Name_________________________________________
... 3. How many atoms are there in 5.00 g of carbon tetrafluoride? 4. How many grams of fluorine needed to produce 4.981 mol of nitrogen trifluoride? 5. A student is asked to make 10.00 g of the carbon tetrafluoride. He is told that the reaction had a 80% yield. How many grams of cyanogen will he need t ...
... 3. How many atoms are there in 5.00 g of carbon tetrafluoride? 4. How many grams of fluorine needed to produce 4.981 mol of nitrogen trifluoride? 5. A student is asked to make 10.00 g of the carbon tetrafluoride. He is told that the reaction had a 80% yield. How many grams of cyanogen will he need t ...
Stoichiometry - Free
... 1.3 Ideal gas and mole concept The concept of mole is applicable to identical entities (atoms, molecules, ions). Thus, its direct application is restricted to pure substances irrespective of its state (solid, liquid and gas). For all practical purposes, we treat mole as an alternative expression o ...
... 1.3 Ideal gas and mole concept The concept of mole is applicable to identical entities (atoms, molecules, ions). Thus, its direct application is restricted to pure substances irrespective of its state (solid, liquid and gas). For all practical purposes, we treat mole as an alternative expression o ...
ХИМИЯ НА АНГЛИЙСКОМ ЯЗЫКЕ
... 1.38. A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the soluti ...
... 1.38. A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the soluti ...
Solution-Solubility-Equilibrium
... longer increases but remains constant. No matter how long or how vigorously the mixture of solute and water is stirred (provided the temperature is kept constant) the concentration remains constant. This solution is now saturated with solute. Chemists believe that the dissolving action does not ceas ...
... longer increases but remains constant. No matter how long or how vigorously the mixture of solute and water is stirred (provided the temperature is kept constant) the concentration remains constant. This solution is now saturated with solute. Chemists believe that the dissolving action does not ceas ...
Removal of Oxygen from Biogas via Catalytic Oxidation of Methane
... 0.25 vol.-% propane (or LPG) are applied for this task. This is due to the significant differences in partial pressures of the fuel gases, as the LPG content needs to be adapted to the amount of oxygen, while methane is available in large surplus in-situ in the gas stream. Furthermore, Fig. 6 shows ...
... 0.25 vol.-% propane (or LPG) are applied for this task. This is due to the significant differences in partial pressures of the fuel gases, as the LPG content needs to be adapted to the amount of oxygen, while methane is available in large surplus in-situ in the gas stream. Furthermore, Fig. 6 shows ...
the powerpoint
... • A coefficient is the number that comes before the chemical formula and indicates the number of particles that participate in the reaction. • In order to determine whether an equation is balanced, multiply the number in front of the chemical formula in the equation (coefficient) by the number writt ...
... • A coefficient is the number that comes before the chemical formula and indicates the number of particles that participate in the reaction. • In order to determine whether an equation is balanced, multiply the number in front of the chemical formula in the equation (coefficient) by the number writt ...
Determination of the Molar Volume of H2(g) and of O2(g)
... A measured amount of magnesium will be reacted with excess hydrochloric acid, HCl(aq), and the hydrogen collected by downward displacement of water. We will measure and record the volume of H2(g) collected. ...
... A measured amount of magnesium will be reacted with excess hydrochloric acid, HCl(aq), and the hydrogen collected by downward displacement of water. We will measure and record the volume of H2(g) collected. ...
notice concerning copyright restrictions
... Orogeny was characterized by NE-SW compression, and the formation of foreland basins and uplifted fault blocks (Corbitt and Woodward, 1973; Drewes, 1978; Seager and Mack, 1986). Around 32 to 30 Ma, a shift to backarc extension onset rift inception, and was followed by alkali rhyolite and basaltic an ...
... Orogeny was characterized by NE-SW compression, and the formation of foreland basins and uplifted fault blocks (Corbitt and Woodward, 1973; Drewes, 1978; Seager and Mack, 1986). Around 32 to 30 Ma, a shift to backarc extension onset rift inception, and was followed by alkali rhyolite and basaltic an ...
CHAPtER 2 Energy calculations
... fuels themselves are gases. While it is possible to measure their masses, it is often more convenient and meaningful to measure their volumes. Gases have properties and exhibit behaviours that are different from liquids and solids. Scientists use the kinetic molecular theory of gases to explain obse ...
... fuels themselves are gases. While it is possible to measure their masses, it is often more convenient and meaningful to measure their volumes. Gases have properties and exhibit behaviours that are different from liquids and solids. Scientists use the kinetic molecular theory of gases to explain obse ...
Unit3_Stoichiometry_vs2
... particles of a substance become evenly distributed, as a result of their random movements. • Diffusion rates are related to the average kinetic energy of the particle: KE = (1/2)mv2 ...
... particles of a substance become evenly distributed, as a result of their random movements. • Diffusion rates are related to the average kinetic energy of the particle: KE = (1/2)mv2 ...
17.2.3 Interhalogen compounds(65-67)
... T-shaped structure of CzV symmetry, consistent with the presence of 10 electrons in the valency shell of the central atom (Fig. 17.7a,b). A notable feature of both structures is the slight deviation from colinearity of the apical F-X-F bonds, the angle being 175.0" for ClF3 and 172.4' for BrF3; this ...
... T-shaped structure of CzV symmetry, consistent with the presence of 10 electrons in the valency shell of the central atom (Fig. 17.7a,b). A notable feature of both structures is the slight deviation from colinearity of the apical F-X-F bonds, the angle being 175.0" for ClF3 and 172.4' for BrF3; this ...
coordination compounds - Ahlcon Public School , Mayur Vihar Ph
... substance (D) which turned Nessler’s reagent brown. Identify (A) to (E) and give the reactions involved. 34. A translucent white waxy solid (A) on heating in an inert atmosphere is converted to its allotropic form (B). Allotrope (A) on reaction with very dilute aqueous KOH liberates a highly poisono ...
... substance (D) which turned Nessler’s reagent brown. Identify (A) to (E) and give the reactions involved. 34. A translucent white waxy solid (A) on heating in an inert atmosphere is converted to its allotropic form (B). Allotrope (A) on reaction with very dilute aqueous KOH liberates a highly poisono ...
CP Chemistry - Final Exam Review KEY
... A gas takes up a volume of 17.3 liters, has a pressure of 2.30 atm, and a temperature of 299 K. If I raise the temperature to 350. K and lower the pressure to 1.5 atm, what is the new volume of the gas? Which law is this? ...
... A gas takes up a volume of 17.3 liters, has a pressure of 2.30 atm, and a temperature of 299 K. If I raise the temperature to 350. K and lower the pressure to 1.5 atm, what is the new volume of the gas? Which law is this? ...
chemistry paper 1
... enthalpy change, in kJ mol–1, of the dissolving process of KCl(s) under the conditions of the experiment ? (Specific heat capacity of the mixture = 4.2 J g−1 K−1 ; Density of water = 1.0 g cm−3 ; ...
... enthalpy change, in kJ mol–1, of the dissolving process of KCl(s) under the conditions of the experiment ? (Specific heat capacity of the mixture = 4.2 J g−1 K−1 ; Density of water = 1.0 g cm−3 ; ...
Chemical Dynamics, Thermochemistry, and Quantum Chemistry
... monitoring temperature until the slope of the temperature versus time curve is reasonably constant (i.e. each time step the temperature changes by a constant increment). ...
... monitoring temperature until the slope of the temperature versus time curve is reasonably constant (i.e. each time step the temperature changes by a constant increment). ...
Gas Stoichiometry
... Example of a Gas Stoichiometry Problem Airbags in automobiles contain sodium azide (NaN3), potassium nitrate, and silicon dioxide. (All are solids.) 1. Upon impact, the bag is inflated by the thermal decomposition of sodium azide (NaN3) to sodium metal and nitrogen gas. 2. Because sodium is toxic a ...
... Example of a Gas Stoichiometry Problem Airbags in automobiles contain sodium azide (NaN3), potassium nitrate, and silicon dioxide. (All are solids.) 1. Upon impact, the bag is inflated by the thermal decomposition of sodium azide (NaN3) to sodium metal and nitrogen gas. 2. Because sodium is toxic a ...
Gas chromatography
Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture (the relative amounts of such components can also be determined). In some situations, GC may help in identifying a compound. In preparative chromatography, GC can be used to prepare pure compounds from a mixture.In gas chromatography, the mobile phase (or ""moving phase"") is a carrier gas, usually an inert gas such as helium or an unreactive gas such as nitrogen. The stationary phase is a microscopic layer of liquid or polymer on an inert solid support, inside a piece of glass or metal tubing called a column (a homage to the fractionating column used in distillation). The instrument used to perform gas chromatography is called a gas chromatograph (or ""aerograph"", ""gas separator"").The gaseous compounds being analyzed interact with the walls of the column, which is coated with a stationary phase. This causes each compound to elute at a different time, known as the retention time of the compound. The comparison of retention times is what gives GC its analytical usefulness.Gas chromatography is in principle similar to column chromatography (as well as other forms of chromatography, such as HPLC, TLC), but has several notable differences. First, the process of separating the compounds in a mixture is carried out between a liquid stationary phase and a gas mobile phase, whereas in column chromatography the stationary phase is a solid and the mobile phase is a liquid. (Hence the full name of the procedure is ""Gas–liquid chromatography"", referring to the mobile and stationary phases, respectively.) Second, the column through which the gas phase passes is located in an oven where the temperature of the gas can be controlled, whereas column chromatography (typically) has no such temperature control. Finally, the concentration of a compound in the gas phase is solely a function of the vapor pressure of the gas.Gas chromatography is also similar to fractional distillation, since both processes separate the components of a mixture primarily based on boiling point (or vapor pressure) differences. However, fractional distillation is typically used to separate components of a mixture on a large scale, whereas GC can be used on a much smaller scale (i.e. microscale).Gas chromatography is also sometimes known as vapor-phase chromatography (VPC), or gas–liquid partition chromatography (GLPC). These alternative names, as well as their respective abbreviations, are frequently used in scientific literature. Strictly speaking, GLPC is the most correct terminology, and is thus preferred by many authors.