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Study Resources (Chemistry)

11) The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g) → 4 NO2(g) + O2(g) If the rate of appearance of O2 is equal to 2.40 mol/min at a particular moment, what is the rate of disappearance of N2O5 at that moment? A) 0.600 mol/min B) 1.20 mol/min C) 4.80 mol/min D).
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12.2   Algorithmic Questions 1) The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below.  If the rate of appearance of Cr2(SO4)3 is 1.64 mol/min at a particular moment, what is the rate of disappearance of C2H6O at that moment? 2.
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120) Drawing (1) shows the equilibrium vapor pressure of a pure liquid. Which drawing (2)-(5) represents the equilibrium vapor pressure when a nonvolatile solute is dissolved in the liquid? A) drawing (2) B) drawing (3) C) drawing (4) D) drawing (5) 121) Drawings (1) and (2) show the equilibrium vapor pressures of two pure liquids..
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21) When an ionic solute dissolves in water to form an unsaturated solution, the free energy change (ΔGsoln) is A) negative. B) zero. C) positive. D) either A or C, depending on the ionic compound 22) The change in the Gibbs free energy for dissolving more solute in a supersaturated solution is A) negative. B) zero. C) positive. D).
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Arrows in the energy diagram below represent enthalpy changes occurring in the exothermic formation of a solution:   ΔHsoln = enthalpy of solution ΔHsolute-solute = enthalpy change involving solute-solute interactions ΔHsolute-solvent = enthalpy change involving solute-solvent interactions ΔHsolvent-solvent = enthalpy change involving solvent-solvent interactions 110) Which arrow represents ΔHsoln? A) arrow (a) B) arrow (b) C) arrow (c) D) arrow.
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11.3   Short Answer Questions 1) In a solution that is 55% ethyl alcohol and 45% water, the solute is ________ and the solvent is ________. 2) According to the rule of thumb "like dissolves like." ionic solids like NaCl or polar substances like glucose are more soluble in ________ solvents, whereas nonpolar.
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Consider the interconversion of A molecules (shaded spheres) and B molecules (unshaded spheres) according to the reaction A ? B. Each of the following series of pictures represents a separate experiment in which time increases from left to right.     93) Which of these experiments has resulted in an equilibrium state? A).
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81) Calcium carbonate is relatively insoluble and the dissolution reaction is endothermic: CaCO3(s) ? Ca2+(aq) + CO32-(aq). Which change in reaction condition below will shift the equilibrium to the right? A) add an acid to react with CO32- ion B) add an anion with which Ca2+ is even less soluble than calcium.
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11.1   Multiple Choice Questions 1) Which of the following mixtures have components which can be separated by filtration? A) colloids B) solutions C) suspensions D) all of the above 2) Stainless steel is an example of a ________ solution. A) gas/solid B) liquid/liquid C) solid/liquid D) solid/solid 3) In most liquid solutions, the component present in the larger amount is called.
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13.1   Multiple Choice Questions 1) Which one of the following statements does not describe the equilibrium state? A) Equilibrium is dynamic and there is no net conversion to reactants and products. B) The concentration of the reactants is equal to the concentration of the products. C) The concentration of the reactants and products reach.
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12.1   Multiple Choice Questions 1) Which term describes the measure of the increase in the concentration of a product per unit time? A) activation energy B) kinetics C) reaction rate D) reaction time 2) "Instantaneous rate" is defined as the A) change in concentration per unit time. B) equation showing how the rate depends on the concentration of.
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21) The hydrolysis of tert-butyl chloride is given in the reaction below: (CH3)3CCl(aq) + H2O(l) → (CH3)3COH(aq) + H+(aq) + Cl-(aq) If the rate law is: Rate = k[(CH3)3CCl], what is the order of the reaction with respect to water? A) zero B) first C) second D) third 22) Given the following hypothetical reaction: 2 E(g) +.
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91) The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32+ + 3 H3O+ + 3 H2O → Fe(H2O)62+ + 3 phenH+ If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1, what is the frequency factor, A? A).
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122) Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume. What is the half-life of decomposition in vessel (b) relative to the half-life of decomposition in vessel (a)? A) half-life in vessel (b)/half-life in vessel (a) = 4:1 B) half-life in vessel (b)/half-life in vessel (a).
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71) The pink and blue species below form a violet colored mixture at equilibrium: [Co(H2O)6]2+ (aq) + 4 Cl- (aq) ? [CoCl4]2- (aq) + 6 H2O (l) (pink)(blue) If the concentration of [Co(H2O)6]2+ is increased, what happens to the solution? A) The concentration of [CoCl4]2- increases. B) The concentration of [CoCl4]2- decreases. C) The solution becomes.
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The following pictures represent the initial state and the equilibrium state for the gaseous state reaction of A2 molecules (shaded spheres) with B atoms (unshaded spheres) to give AB molecules.     113) What is the best balanced chemical equation for the reaction? A) A2 + B ? A2B B) 1A2 + 2 B ?.
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11) For which case would ΔHsoln be expected to be negative? A) if solute-solute interactions are much greater than solvent-solvent and solute-solvent interactions B) if solvent-solvent interactions are much greater than solute-solvent and solute-solute interactions C) if solute-solvent interactions are much greater than solvent-solvent and solute-solute interactions D) if solute-solvent interactions are the same.
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51) Cyclohexane (C6H12) undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane (CH3C5H9) according to the equation: C6H12 ? CH3C5H9 If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.100 M, respectively. A).
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