Edexcel A2 Chemistry Questions and Answers Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Unit 4 Rates‚ equilibria and further organic chemistry Multiple-choice questions ..............................................................................7 Structured questions . . . . . . . . . . . .
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POTENTIOMETRIC DETERMINATION OF THE PURITY AND DSSOCIATION CONSTANT OF HYDROGEN PHTHALATE Department of Chemical Engineering‚ College of Engineering University of the Philippines‚ Diliman‚ Quezon City‚ Philippines Date Due: September 20‚ 2013 Date Submitted: September 20‚ 2013 RESULTS AND DISCUSSION An experiment was conducted to determine the purity of Hydrogen Phthalate sample and its dissociation constant. To perform the experiment with the utmost precision‚ equivalence point was
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each part of each problem carefully. ● Write your answers legibly in the corresponding spaces of the attached sheets. ● For problems requiring calculations‚ you must show these calculations clearly and indicate all values‚ including physical constants used to obtain your quantitative result. Significant figure and unit usage must be correct. ● If you do not understand what the problem is asking‚ raise your hand and a proctor will come to your desk. ● Some relevant equations and the periodic
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SCH 4U1 FINAL EXAM REVIEW ATOMIC STRUCTURE AND MOLECULAR ARCHITECTURE 1. Describe the wave mechanical model of the atom. 2. Write the ground state electron configuration for Br. 3. Explain why the first ionization energy for Ne is significantly greater than Na. 4. Distinguish between ionization energy and electronegativity. 5. How does VSEPR Theory account for the fact that the bond angle in H2O is less than NH3? 6. Which of the following molecules are polar? Include diagrams
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acetic acid is very slightly ionized (it would approach 99% ionization only as the concentration approaches 0.0 M): HC2H3O2(aq) + H2O(l) Ka = 1.8 x 10-5. H3O+ + C2H3O2- In general‚ if the acid is not extremely weak‚ the pH of a solution of a weak acid is governed by the concentration of the acid and Ka. Under similar conditions‚ the pH of a solution of a weak base is determined by the concentration of the weak base and Kb. In solutions containing both a weak acid and a strong acid‚ both acids play
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2- adrenoreceptors 1”. Atenolol has the molecular formula of C14H22N2O3. Its molecular mass is 266.3 grams and its IUPAC name is (RS)-4-(2-hydroxy-3-isopropylaminopropoxy) phenylacetamide. Its melting point 152-155 degrees Celsius‚ has a dissociation constant (pKa) of 9.6 at 24 degrees Celsius. It is soluble in water‚ ethanol and methanol but it is insoluble in ether 2.Atenolol can be synthesized in two parts. The first synthesis is with the reaction of phenol and formaldehyde to form the 4-(hydroxymethyl)phenol
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17.1 The Common Ion Effect • The dissociation of a weak electrolyte is decreased by the addition of a strong electrolyte that has an ion in common with the weak electrolyte. • For example‚ consider the ionization of a weak acid‚ acetic acid. HC2H3O2(aq) ⇋ H+(aq) + C2H3O2–(aq) • • This causes a reduction in the [H+] and a decrease in the percent ionization of the acetic acid. • By adding sodium acetate‚ we have disturbed the acetic acid equilibrium. • • If we add additional
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equilibrium constant reversibility LeChâtelier’s Principle ICE table Q and Keq major species minor species Keq‚f vs Keq‚r rate constant vs. equilibrium expressions significance of magnitude of Keq equilibrium shift with concentration changes equilibrium shift with temperature changes equilibrium shift with volume changes Chapter 16: Acid-Base Euilibrium Brønsted-Lowry acid Brønsted-Lowry base amphoteric water equilibrium constant pH pOH pH
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Determining the equilibrium constant from pH values of changing concentrations of ethanoic acid Design Research question: How will altering the concentrations of ethanoic acid affect the pH value‚ and‚ in-turn‚ the equilibrium constant? Background information: When weak acids react‚ the reaction typically does not go to completion. Rather‚ the system goes to an intermediate state in which the rates of the forward and reverse reactions are equal. Such a system is said to be in chemical equilibrium
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Lab 1: Determining the pK a of PNP PNP or paranitrophenol is an organic compound that undergoes changes when the pH is manipulated of the solution. PNP is also an acid/ base indicator. The compounded starts off as internal conjugated ring with the hydroxyl group and the nitro group single bonded to the aromatic ring. This occurs at the pH of 5. At this point the aromatic compound is colorless and is in the ultraviolet range. However‚ as the pH begins to increase the hydroxyl group deprotonates
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