Chemistry Exemplar Problems
... development of syllabi and textbooks for all stages of school education. In this phase, a conscious effort has been made to discourage rote learning and to enhance comprehension. This is well in tune with the NPE-1986 and Learning Without Burden-1993 that recommend child centred system of education. ...
... development of syllabi and textbooks for all stages of school education. In this phase, a conscious effort has been made to discourage rote learning and to enhance comprehension. This is well in tune with the NPE-1986 and Learning Without Burden-1993 that recommend child centred system of education. ...
Chemistry (Revised)
... Draw a diagram to show an assembled apparatus that could be used to measure the volume of H2S gas produced when a sample of iron(II) sulfide reacts with hydrochloric acid. Your diagram should be labelled and should show the names of any chemicals used. ...
... Draw a diagram to show an assembled apparatus that could be used to measure the volume of H2S gas produced when a sample of iron(II) sulfide reacts with hydrochloric acid. Your diagram should be labelled and should show the names of any chemicals used. ...
2013 - SQA
... Draw a diagram to show an assembled apparatus that could be used to measure the volume of H2S gas produced when a sample of iron(II) sulfide reacts with hydrochloric acid. Your diagram should be labelled and should show the names of any chemicals used. ...
... Draw a diagram to show an assembled apparatus that could be used to measure the volume of H2S gas produced when a sample of iron(II) sulfide reacts with hydrochloric acid. Your diagram should be labelled and should show the names of any chemicals used. ...
sample
... D) The interpretation of data by alchemists was not biased by their overall view of life. E) Alchemists failed because they did not develop any practical chemical methods. Ans: C Difficulty: M 9. Which of the following activities is not a part of good science? A) proposing a theory D) designing expe ...
... D) The interpretation of data by alchemists was not biased by their overall view of life. E) Alchemists failed because they did not develop any practical chemical methods. Ans: C Difficulty: M 9. Which of the following activities is not a part of good science? A) proposing a theory D) designing expe ...
Topic 6 Section C
... (1) Chlorine is produced when dilute hydrochloric acid is added to chlorine bleach. Chlorine oxidizes iodide ions to iodine. Therefore the filter paper moistened with potassium iodide solution turns brown due to the formation of iodine. (3) Chlorine oxidizes iodide ions to iodine. Cl2(aq) + 2I-(aq) ...
... (1) Chlorine is produced when dilute hydrochloric acid is added to chlorine bleach. Chlorine oxidizes iodide ions to iodine. Therefore the filter paper moistened with potassium iodide solution turns brown due to the formation of iodine. (3) Chlorine oxidizes iodide ions to iodine. Cl2(aq) + 2I-(aq) ...
FREE Sample Here
... D) The interpretation of data by alchemists was not biased by their overall view of life. E) Alchemists failed because they did not develop any practical chemical methods. Ans: C Difficulty: M 9. Which of the following activities is not a part of good science? A) proposing a theory D) designing expe ...
... D) The interpretation of data by alchemists was not biased by their overall view of life. E) Alchemists failed because they did not develop any practical chemical methods. Ans: C Difficulty: M 9. Which of the following activities is not a part of good science? A) proposing a theory D) designing expe ...
Chapter 8: Balances on Nonreactive Processes
... *The flow rates were obtained by multiplying the molar fraction of each component by the total flow rate of the corresponding stream. *The enthalpy of the liquid water exiting the system was set to zero since it is leaving the system at the reference conditions. This also occurs for the nitrogen and ...
... *The flow rates were obtained by multiplying the molar fraction of each component by the total flow rate of the corresponding stream. *The enthalpy of the liquid water exiting the system was set to zero since it is leaving the system at the reference conditions. This also occurs for the nitrogen and ...
Physical Chemistry
... energy functions (A and G) and their variations with variables like temperature, pressure, volume and amount. The changes in these properties depend only on the initial and final states of the system, and are independent of the path followed for the system Therefore, these thermodynamic properties a ...
... energy functions (A and G) and their variations with variables like temperature, pressure, volume and amount. The changes in these properties depend only on the initial and final states of the system, and are independent of the path followed for the system Therefore, these thermodynamic properties a ...
Biomass Program
... The largest use of syngas is for hydrogen production (Wender, 1996). Hydrogen is produced as both a main product and as a by-product. Hydrogen producers often consume the product captively (e.g., ammonia producers, oil refineries, and methanol producers). The total amount of hydrogen consumed worldw ...
... The largest use of syngas is for hydrogen production (Wender, 1996). Hydrogen is produced as both a main product and as a by-product. Hydrogen producers often consume the product captively (e.g., ammonia producers, oil refineries, and methanol producers). The total amount of hydrogen consumed worldw ...
Modern Analytical Chemistry
... Electrochemical Methods of Analysis 461 11A Classification of Electrochemical Methods 462 11A.1 Interfacial Electrochemical Methods 462 11A.2 Controlling and Measuring Current and ...
... Electrochemical Methods of Analysis 461 11A Classification of Electrochemical Methods 462 11A.1 Interfacial Electrochemical Methods 462 11A.2 Controlling and Measuring Current and ...
Influence of Temperature on Electrical
... is necessary, which means further expenses in purchase and maintenance. Today most conductivity measuring instruments have an integrated temperature gauge. If the temperature dependence is known, the conductivity value at 25 °C can be calculated. However, there are differences of opinion on the usef ...
... is necessary, which means further expenses in purchase and maintenance. Today most conductivity measuring instruments have an integrated temperature gauge. If the temperature dependence is known, the conductivity value at 25 °C can be calculated. However, there are differences of opinion on the usef ...
Author final version (postprint) - DTU Orbit
... agreement was observed between the results obtained using the two different systems. In the context of the PhD project, it was also important to investigate the spectral properties of major combustion species such as carbon dioxide and carbon monoxide in the infrared range at high temperatures to pr ...
... agreement was observed between the results obtained using the two different systems. In the context of the PhD project, it was also important to investigate the spectral properties of major combustion species such as carbon dioxide and carbon monoxide in the infrared range at high temperatures to pr ...
CHAPTER 5 GASES
... Recall that Avogadro’s Law states that the volume of a gas is directly proportional to the number of moles of gas at constant temperature and pressure. The ammonia and nitric oxide coefficients in the balanced equation are the same, so one volume of nitric oxide must be obtained from one volume of a ...
... Recall that Avogadro’s Law states that the volume of a gas is directly proportional to the number of moles of gas at constant temperature and pressure. The ammonia and nitric oxide coefficients in the balanced equation are the same, so one volume of nitric oxide must be obtained from one volume of a ...
GAS LAW PROBLEMS
... 1. Calcium hydride reacts with water to form hydrogen gas and calcium hydroxide. This reaction is sometimes used to inflate life rafts, weather balloons, and the like where a simple, compact means of generating H2 is desired. How many grams of calcium hydride are needed to generate 10.0 L of H2 gas ...
... 1. Calcium hydride reacts with water to form hydrogen gas and calcium hydroxide. This reaction is sometimes used to inflate life rafts, weather balloons, and the like where a simple, compact means of generating H2 is desired. How many grams of calcium hydride are needed to generate 10.0 L of H2 gas ...
Removal of hydrogen fluoride from gas streams
... before for any degree or examination in any other University. ...
... before for any degree or examination in any other University. ...
www.iitvidya.com salt analysis assignment 1. A compound on
... 39. A metallic chloride (A) does not respond chromyl chloride test. However (A) gives a white ppt. with limited amount of another metal chloride (B) and grey ppt. with excess amount of (B). (A) when treated with KI gives a scarlet ppt. which dissolves in excess of Ki forming an important reagent (C) ...
... 39. A metallic chloride (A) does not respond chromyl chloride test. However (A) gives a white ppt. with limited amount of another metal chloride (B) and grey ppt. with excess amount of (B). (A) when treated with KI gives a scarlet ppt. which dissolves in excess of Ki forming an important reagent (C) ...
Concept based notes Chemistry Lab Manual
... Q. 89. What is the principle of chromatography? Ans. It is based on the differential migration of the individual components of a mixture through a stationary phase under the influence of a mobile phase. Q. 90. Name some chromatography techniques? Ans. Paper chromatography, column chromatography, thi ...
... Q. 89. What is the principle of chromatography? Ans. It is based on the differential migration of the individual components of a mixture through a stationary phase under the influence of a mobile phase. Q. 90. Name some chromatography techniques? Ans. Paper chromatography, column chromatography, thi ...
IIT-JEE (Advanced) - Brilliant Public School Sitamarhi
... If the amount of O2 evolved was 146.8 ml at S.T.P., calculate the % by weight of KClO4 in the residue. Q.13 A sample of calcium carbonate contains impurities which do not react with a mineral acid. When 2 grams of the sample were reacted with the mineral acid, 375 ml of carbon dioxide were obtained ...
... If the amount of O2 evolved was 146.8 ml at S.T.P., calculate the % by weight of KClO4 in the residue. Q.13 A sample of calcium carbonate contains impurities which do not react with a mineral acid. When 2 grams of the sample were reacted with the mineral acid, 375 ml of carbon dioxide were obtained ...
Quantitative Chemical Analysis
... One of our most pressing problems is the need for sources of energy to replace oil. The chart at the right shows that world production of oil per capita has probably already peaked. Oil will play a decreasing role as an energy source and should be more valuable as a raw material than as a fuel. Ther ...
... One of our most pressing problems is the need for sources of energy to replace oil. The chart at the right shows that world production of oil per capita has probably already peaked. Oil will play a decreasing role as an energy source and should be more valuable as a raw material than as a fuel. Ther ...
Novel Methods and Materials in Development of Liquid Carrier
... acquired knowledge and abilities approach their capacity limits. Secondly, the main issue seems to be overcoming the arising frustrations of every kind, since experimental work can be as difficult as modelling and conducting simulations on computer. However, relativising this, it is good to keep in ...
... acquired knowledge and abilities approach their capacity limits. Secondly, the main issue seems to be overcoming the arising frustrations of every kind, since experimental work can be as difficult as modelling and conducting simulations on computer. However, relativising this, it is good to keep in ...
Calculations and the Chemical Equation
... information requested by the problem. It is often useful to map a pattern for the required conversion before beginning the problem. Compounds Compounds are pure substances that are composed of two or more elements that are chemically combined. They are represented by their chemical formula, a combin ...
... information requested by the problem. It is often useful to map a pattern for the required conversion before beginning the problem. Compounds Compounds are pure substances that are composed of two or more elements that are chemically combined. They are represented by their chemical formula, a combin ...
Final Exam - KFUPM Faculty List
... Solved by W. Föِrner, 31.5.2007 Q1. Distillation can readily be used to separate A) a dissolved solid in a liquid correct: the liquid boils off and the solid stays back B) the elements in a chemical compound incorrect: that needs chemical reactions, not distillation C) a heterogeneous mixture of two ...
... Solved by W. Föِrner, 31.5.2007 Q1. Distillation can readily be used to separate A) a dissolved solid in a liquid correct: the liquid boils off and the solid stays back B) the elements in a chemical compound incorrect: that needs chemical reactions, not distillation C) a heterogeneous mixture of two ...
Ch 10 Practice Problems 1. Consider the process A(l) A(s). Which
... For the reaction A + B C + D, H° = +40 kJ and S° = +50 J/K. Therefore, the reaction under standard conditions is A) spontaneous at temperatures less than 10 K. B) spontaneous at temperatures greater than 800 K. C) spontaneous only at temperatures between 10 K and 800 K. D) spontaneous at all tem ...
... For the reaction A + B C + D, H° = +40 kJ and S° = +50 J/K. Therefore, the reaction under standard conditions is A) spontaneous at temperatures less than 10 K. B) spontaneous at temperatures greater than 800 K. C) spontaneous only at temperatures between 10 K and 800 K. D) spontaneous at all tem ...
GCSE Chemistry Sample Assessment Materials
... Lucy wanted to find the solubility of substance X at room temperature. She measured 20.0 g of the substance into a conical flask and added 50.0 g of water. She stirred the mixture carefully until no more solid dissolved. She then separated the undissolved solid using a filter paper and dried the pap ...
... Lucy wanted to find the solubility of substance X at room temperature. She measured 20.0 g of the substance into a conical flask and added 50.0 g of water. She stirred the mixture carefully until no more solid dissolved. She then separated the undissolved solid using a filter paper and dried the pap ...
György Dombi Gerda Szakonyi Authors
... The temperature of the sample is not needed to be monitored to correct the result with a temperature factor because the temperature is kept constant during the measurement. The instrument need not to be calibrated with solutions of known conductance as relative changes are being recorded. ...
... The temperature of the sample is not needed to be monitored to correct the result with a temperature factor because the temperature is kept constant during the measurement. The instrument need not to be calibrated with solutions of known conductance as relative changes are being recorded. ...
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.