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... **Calculate ΔH, ΔS, and ΔG at 298K for the reaction: 2PCl3 + O2 2POCl3 ΔH= 2(-542.2) - 2(-288.07)= -508.26 kJ/mol ΔG= 2(-502.5) – 2(-269.6)= -465.8 ΔS= 2(325) – [2(311.7) + 205]= -178.4 J/mol K **At equilibrium, what will be the temperature of the system? ΔG= ΔH - T ΔS 0= ΔH - T ΔS ...
... **Calculate ΔH, ΔS, and ΔG at 298K for the reaction: 2PCl3 + O2 2POCl3 ΔH= 2(-542.2) - 2(-288.07)= -508.26 kJ/mol ΔG= 2(-502.5) – 2(-269.6)= -465.8 ΔS= 2(325) – [2(311.7) + 205]= -178.4 J/mol K **At equilibrium, what will be the temperature of the system? ΔG= ΔH - T ΔS 0= ΔH - T ΔS ...
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... A. Energy can never be created or destroyed but it can be changed from one form to another. B. Two bodies in thermal contact are at thermal equilibrium with each other if the two bodies are at the same absolute temperature. C. Any process carried out in several steps, the overall ∆H is equal to the ...
... A. Energy can never be created or destroyed but it can be changed from one form to another. B. Two bodies in thermal contact are at thermal equilibrium with each other if the two bodies are at the same absolute temperature. C. Any process carried out in several steps, the overall ∆H is equal to the ...
Exam #2
... (A) phenolphthalein is a very strong acid that is capable of rapid dissociation (B) the solution being titrated undergoes a large pH change near the end point of the titration (C) phenolphthalein undergoes an irreversible reaction in basic solution (D) OH¯ acts as a catalyst for the decomposition of ...
... (A) phenolphthalein is a very strong acid that is capable of rapid dissociation (B) the solution being titrated undergoes a large pH change near the end point of the titration (C) phenolphthalein undergoes an irreversible reaction in basic solution (D) OH¯ acts as a catalyst for the decomposition of ...
Test review
... a. evaporation of 1 mol of CCl4 (l) b. mixing 5 mL ethanol with 25 mL water c. compressing 1 mol Ne at constant temperature from 1.5 L to 0.5 L d. raising the temperature of 100 g Cu from 275 K to 295 K e. grinding a large crystal of KCl to powder 10. Hydrogen for use in ammonia production is produc ...
... a. evaporation of 1 mol of CCl4 (l) b. mixing 5 mL ethanol with 25 mL water c. compressing 1 mol Ne at constant temperature from 1.5 L to 0.5 L d. raising the temperature of 100 g Cu from 275 K to 295 K e. grinding a large crystal of KCl to powder 10. Hydrogen for use in ammonia production is produc ...
Chem 1711 Review Exam 2
... flask and adding water to the mark. Another solution was prepared by adding 0.530 g of anhydrous sodium carbonate to a 100.0 mL volumetric flask and adding water to the mark. Then, 25.00 mL of the sodium carbonate solution was pipetted into a flask and titrated with the dilute acid. The stoichiometr ...
... flask and adding water to the mark. Another solution was prepared by adding 0.530 g of anhydrous sodium carbonate to a 100.0 mL volumetric flask and adding water to the mark. Then, 25.00 mL of the sodium carbonate solution was pipetted into a flask and titrated with the dilute acid. The stoichiometr ...
Final Exam Practice Problems: R = 0.0821 Latm/molK NA = 6.022
... 2. A substance that can't be chemically broken down into simpler substances is considered to be A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) an electron. 3. Which of the following are examples of a chemical change? A) coffee brewing B) water boiling C) leave ...
... 2. A substance that can't be chemically broken down into simpler substances is considered to be A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) an electron. 3. Which of the following are examples of a chemical change? A) coffee brewing B) water boiling C) leave ...
Test - Angelfire
... 4. A calculator is essential for the Chemistry 12 Provincial Examination. The calculator must be a hand-held device designed primarily for mathematical computations involving logarithmic and trigonometric functions and may also include graphing functions. Computers, calculators with a QWERTY keyboar ...
... 4. A calculator is essential for the Chemistry 12 Provincial Examination. The calculator must be a hand-held device designed primarily for mathematical computations involving logarithmic and trigonometric functions and may also include graphing functions. Computers, calculators with a QWERTY keyboar ...
1999 U. S. NATIONAL CHEMISTRY OLYMPIAD
... § Make no marks on the test booklet. Do all calculations on scratch paper provided by your instructor. § There is only one correct answer to each question. Any questions for which more than one response has been blackened will not be counted. § Your score is based solely on the number of questions y ...
... § Make no marks on the test booklet. Do all calculations on scratch paper provided by your instructor. § There is only one correct answer to each question. Any questions for which more than one response has been blackened will not be counted. § Your score is based solely on the number of questions y ...
Exam 2, Fall 2001
... (3 points) A 100.-mL sample of a soft drink containing citric acid requires 33.51 mL of 0.0102 M NaOH to neutralize the acid completely. What mass of citric acid (molar mass = 192.1 g/mol) does the soft drink sample contain? The reaction of citric acid and NaOH is H3C6H5O7(aq) + 3 NaOH(aq) → Na3C6H5 ...
... (3 points) A 100.-mL sample of a soft drink containing citric acid requires 33.51 mL of 0.0102 M NaOH to neutralize the acid completely. What mass of citric acid (molar mass = 192.1 g/mol) does the soft drink sample contain? The reaction of citric acid and NaOH is H3C6H5O7(aq) + 3 NaOH(aq) → Na3C6H5 ...
Sample 112 Final
... c) iron(III) chloride, Fe2Cl3 d) carbon tetrachloride, CCl4 e) magnesium nitrite, Mg(NO3)2 ...
... c) iron(III) chloride, Fe2Cl3 d) carbon tetrachloride, CCl4 e) magnesium nitrite, Mg(NO3)2 ...
Paper - Edexcel
... 1 The table shows the numbers of protons, neutrons and electrons in some atoms and ions. Atom or ion ...
... 1 The table shows the numbers of protons, neutrons and electrons in some atoms and ions. Atom or ion ...
Please do not remove this page. The periodic table, constants, and
... Which one of the following statements is not true? a. HF is a stronger acid than H2O because F is more electronegative than O. b. For 1.0 M solutions of any 2 weak bases, the solution of the base with the larger Kb will have the greater [OH–]. c. A Lewis acid is an electron pair acceptor. d. For a p ...
... Which one of the following statements is not true? a. HF is a stronger acid than H2O because F is more electronegative than O. b. For 1.0 M solutions of any 2 weak bases, the solution of the base with the larger Kb will have the greater [OH–]. c. A Lewis acid is an electron pair acceptor. d. For a p ...
X012/13/02
... is required to make, by dilution with water, one litre of a solution with a potassium ion concentration of 0·1 mol l –1? A ...
... is required to make, by dilution with water, one litre of a solution with a potassium ion concentration of 0·1 mol l –1? A ...
Question Paper - Revision Science
... Complete the equation for the reaction between the hydrochloric acid in the toilet cleaner and the chloric(I) acid in the bleaching agent. Give a reason why this reaction is to be avoided in accordance with the instructions for the use of the toilet cleaner. ...
... Complete the equation for the reaction between the hydrochloric acid in the toilet cleaner and the chloric(I) acid in the bleaching agent. Give a reason why this reaction is to be avoided in accordance with the instructions for the use of the toilet cleaner. ...
chapter 4 review: types of chemical reactions and solution
... Balance redox reactions (acidic and basic solutions) Solve a variety of problems related to redox titrations – Lab question. 9. A student titrated a 0.500 M acidified solution of ferrous nitrate with a 0.100 M potassium dichromate solution. If the student used 25.0 mL of the ferric nitrate solution, ...
... Balance redox reactions (acidic and basic solutions) Solve a variety of problems related to redox titrations – Lab question. 9. A student titrated a 0.500 M acidified solution of ferrous nitrate with a 0.100 M potassium dichromate solution. If the student used 25.0 mL of the ferric nitrate solution, ...
Chapter 7 Review
... For the reaction CO(g) + 2 H2(g) <---> CH3OH(g) + heat; [CO(g)] = 0.025 mol/L, [H2(g) ] = 0.050 mol/L and [CH3OH(g)] = 0.0063 mol/L a) b) ...
... For the reaction CO(g) + 2 H2(g) <---> CH3OH(g) + heat; [CO(g)] = 0.025 mol/L, [H2(g) ] = 0.050 mol/L and [CH3OH(g)] = 0.0063 mol/L a) b) ...
ic199p5a
... (b) Explain why KNO3(s) is highly soluble in water despite this observation regarding the temperature change on solution. If it is readily soluble, the G for solution is likely to be negative, which means the increase in entropy on dissolution (the TS term) is sufficient to overcome the positive ...
... (b) Explain why KNO3(s) is highly soluble in water despite this observation regarding the temperature change on solution. If it is readily soluble, the G for solution is likely to be negative, which means the increase in entropy on dissolution (the TS term) is sufficient to overcome the positive ...
AP `99 Multiple Choice
... (NH4)2SO4(s) (E) Sr(NO3)2(s) 66. When solid ammonium chloride, NH4Cl(s), is added to water at 25_C it dissolves and the temperature of the solution decreases. Which of the following is true for the values of _H and _S for the dissolving process? (A) Positive ...
... (NH4)2SO4(s) (E) Sr(NO3)2(s) 66. When solid ammonium chloride, NH4Cl(s), is added to water at 25_C it dissolves and the temperature of the solution decreases. Which of the following is true for the values of _H and _S for the dissolving process? (A) Positive ...
1999 Advanced Placement Chemistry Exam
... (NH4)2SO4(s) (E) Sr(NO3)2(s) 66. When solid ammonium chloride, NH4Cl(s), is added to water at 25_C it dissolves and the temperature of the solution decreases. Which of the following is true for the values of _H and _S for the dissolving process? (A) Positive ...
... (NH4)2SO4(s) (E) Sr(NO3)2(s) 66. When solid ammonium chloride, NH4Cl(s), is added to water at 25_C it dissolves and the temperature of the solution decreases. Which of the following is true for the values of _H and _S for the dissolving process? (A) Positive ...
AS Paper 1 Practice Paper 4 - A
... The student decided to use a measuring cylinder to obtain 25.0 cm3 of the supplier’s solution. This was poured into a 250 cm3 graduated flask and the liquid level was made up to the mark with de-ionised water. The student filled a burette with the acid solution. The following results were obtained w ...
... The student decided to use a measuring cylinder to obtain 25.0 cm3 of the supplier’s solution. This was poured into a 250 cm3 graduated flask and the liquid level was made up to the mark with de-ionised water. The student filled a burette with the acid solution. The following results were obtained w ...
+ H 2 O(g)
... Balance the reaction. Describe to which class of compounds (oxide, hydride, acid, base, salt) the reactants and the products belong. Write the ionic and net ionic equation. ...
... Balance the reaction. Describe to which class of compounds (oxide, hydride, acid, base, salt) the reactants and the products belong. Write the ionic and net ionic equation. ...
CHEMISTRY 1710 - Practice Exam #2 (KATZ)
... _____ 7. Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite. A. C. ...
... _____ 7. Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite. A. C. ...
Chemistry 40S – Exam Review
... 15. The [OH-] in a solution is 1.0 x 10-4 mol/L. What is the pH of the solution? 16. What is the [H3O+] in a 0.20 mol/L NaOH solution? 17. A solution has a [H+] of 0.0010 M. What is the [OH-]? 18. What is the [H3O+] in a 0.020 M Ba(OH)2(aq) solution? 19. A base added to a neutral solution will: a) ...
... 15. The [OH-] in a solution is 1.0 x 10-4 mol/L. What is the pH of the solution? 16. What is the [H3O+] in a 0.20 mol/L NaOH solution? 17. A solution has a [H+] of 0.0010 M. What is the [OH-]? 18. What is the [H3O+] in a 0.020 M Ba(OH)2(aq) solution? 19. A base added to a neutral solution will: a) ...
Review for Final Exam - Short Answer and Problems
... Limestone is composed of calcium carbonate (CaCO3) as well as other compounds. In an analysis, a chemist takes a sample of limestone which has a mass of 413 mg and treats it with oxalic acid (H2C2O4). A chemical reaction occurs between the calcium carbonate and the acid producing calcium oxalate and ...
... Limestone is composed of calcium carbonate (CaCO3) as well as other compounds. In an analysis, a chemist takes a sample of limestone which has a mass of 413 mg and treats it with oxalic acid (H2C2O4). A chemical reaction occurs between the calcium carbonate and the acid producing calcium oxalate and ...
Thermometric titration
A thermometric titration is one of a number of instrumental titration techniques where endpoints can be located accurately and precisely without a subjective interpretation on the part of the analyst as to their location. Enthalpy change is arguably the most fundamental and universal property of chemical reactions, so the observation of temperature change is a natural choice in monitoring their progress. It is not a new technique, with possibly the first recognizable thermometric titration method reported early in the 20th century (Bell and Cowell, 1913). In spite of its attractive features, and in spite of the considerable research that has been conducted in the field and a large body of applications that have been developed; it has been until now an under-utilized technique in the critical area of industrial process and quality control. Automated potentiometric titration systems have pre-dominated in this area since the 1970s. With the advent of cheap computers able to handle the powerful thermometric titration software, development has now reached the stage where easy to use automated thermometric titration systems can in many cases offer a superior alternative to potentiometric titrimetry.The applications of thermometric titrimetry discussed on this page are by no means exhaustive. The reader is referred to the bibliography for further reading on the subject.