Search
Info
Warning
Danger

Study Resources (Chemistry)

41) Consider the following reaction at equilibrium: 2NH3 (g)    N2 (g)  +  3H2 (g)ΔH° = +92.4 kJ Le Châtelier's principle predicts that adding N2 (g) to the system at equilibrium will result in __________. A) a decrease in the concentration of NH3 (g) B) a decrease in the concentration of H2 (g) C) an.
0 Views
View Answer
21) The freezing point of ethanol (C2H5OH) is -114.6°C. The molal freezing point depression constant for ethanol is 2.00°C/m. What is the freezing point (°C) of a solution prepared by dissolving 40.0 g of glycerin (C3H8O3, a nonelectrolyte) in 200.0 g of ethanol? A) -115.0 B) -4.34 C) -132.3 D) -118.9 E) -114.6 22) Calculate the.
0 Views
View Answer
15.1   Multiple-Choice Questions 1) At equilibrium, __________. A) all chemical reactions have ceased B) the rates of the forward and reverse reactions are equal C) the rate constants of the forward and reverse reactions are equal D) the value of the equilibrium constant is 1 E) the limiting reagent has been consumed 2) What role did Karl.
3 Views
View Answer
17.1   Multiple-Choice Questions 1) Which one of the following pairs cannot be mixed together to form a buffer solution? A) HONH2, HONH3Cl B) NaCl, HCl C) RbOH, HF D) KOH, HNO2 E) H2SO3, KHSO3 2) Which one of the following pairs cannot be mixed together to form a buffer solution? A) NH3, NH4Cl B) NaC2H3O2, HCl (C2H3O2- =.
2 Views
View Answer
16.2   Bimodal Questions 1) What is the conjugate acid of NH3? A) NH3 B) NH2+ C) NH3+ D) NH4+ E) NH4OH 2) What is the conjugate acid of CO3-2? A) CO2-2 B) HCO2-2 C) H2CO3 D) HCO3- E) none of the above 3) The conjugate base of HSO4- is __________. A) OH- B) H2SO4 C) SO42- D) HSO4+ E) H3SO4+ 4) The conjugate base of H2PO4- is __________. A) PO4-3 B).
0 Views
View Answer
21) Which of the following expressions is the correct equilibrium-constant expression for the reaction below? 2SO2 (g) + O2 (g)  2SO3 (g) A) [SO3] / [SO2][O2] B) [SO2] / [SO3] C) [SO3]2 / [SO2]2[O2] D) [SO3]2 / [SO2]2[O2]2 E) [SO3] / [SO2][O2]2 22) Which of the following expressions is the correct equilibrium-constant expression for the.
0 Views
View Answer
18.1   Multiple-Choice Questions 1) In the troposphere, temperature __________ with increasing altitude, while in the stratosphere, temperature __________ with increasing altitude. A) increases, increases B) decreases, decreases C) increases, decreases D) decreases, increases E) decreases, remains constant 2) Which of the following is (are) not a typical source of carbon dioxide? A) decomposition of organic matter B) release from.
3 Views
View Answer
17.3   Algorithmic Questions 1) Calculate the pH of a solution that is 0.295 M in sodium formate (NaHCO2) and 0.205 M in formic acid (HCO2H). The Ka of formic acid is 1.77 × 10-4. A) 3.910 B) 3.587 C) 13.84 D) 10.10 E) 4.963 2) Calculate the percent ionization of formic acid (HCO2H) in a solution that.
1 Views
View Answer
21) The primary buffer system that controls the pH of the blood is the __________ buffer system. A) carbon dioxide, carbonate B) carbonate, bicarbonate C) carbonic acid, carbon dioxide D) carbonate, carbonic acid E) carbonic acid, bicarbonate 22) What are the principal organs that regulate the pH of the carbonic acid-bicarbonate buffer system in the blood? A).
0 Views
View Answer
16.1   Multiple-Choice Questions 1) According to the Arrhenius concept, an acid is a substance that __________. A) is capable of donating one or more H+ B) causes an increase in the concentration of H+ in aqueous solutions C) can accept a pair of electrons to form a coordinate covalent bond D) reacts with the solvent.
8 Views
View Answer
14.2   Bimodal Questions 1) Consider the following reaction: 3A  →  2B The average rate of appearance of B is given by Δ[B]/Δt. Comparing the rate of appearance of B and the rate of disappearance of A, we get Δ[B]/Δt = __________ × (-Δ[A]/Δt). A) -2/3 B) +2/3 C) -3/2 D) +1 E) +3/2 2) Which substance in.
8 Views
View Answer
14.1   Multiple-Choice Questions 1) A burning splint will burn more vigorously in pure oxygen than in air because A) oxygen is a reactant in combustion and concentration of oxygen is higher in pure oxygen than is in air. B) oxygen is a catalyst for combustion. C) oxygen is a product of combustion. D) nitrogen is.
3 Views
View Answer
14.3   Algorithmic Questions 1) The rate of disappearance of HBr in the gas phase reaction 2HBr (g)  →  H2 (g) + Br2 (g) is 0.301 Ms-1 at 150°C. The rate of appearance of Br2 is __________ Ms-1. A) 1.66 B) 0.151 C) 0.0906 D) 0.602 E) 0.549 2) The rate of disappearance of HBr in the gas phase reaction 2HBr.
0 Views
View Answer
16.3   Algorithmic Questions 1) An aqueous solution at 25.0°C contains [H+] = 0.080 M. What is the pH of the solution? A) 1.10 B) -1.10 C) 13.0 D) 0.0800 E) 1.30 × 10-13 2) The pH of an aqueous solution at 25.0 °C is 10.30. What is the molarity of H+ in this solution? A) 5.0 × 10-11.
5 Views
View Answer
14.5   True/False Questions Questions 1) Rates of reaction can be positive or negative. 2) The instantaneous rate of a reaction can be read directly from the graph of molarity versus time at any point on the graph. 3) The overall reaction order is the sum of the orders of each reactant in the.
1 Views
View Answer
31) At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile (CH3CN): CH3NC (g)  →  CH3CN (g) The reaction is first order in methylisonitrile.  The attached graph shows data for the reaction obtained at 198.9°C. The rate constant for the reaction is __________ s-1. A) -1.9 × 104 B) +1.9 × 104 C) -5.2 × 10-5 D) +5.2 ×.
0 Views
View Answer
14.4   Short Answer Questions 1) The relationship of absorbed light to the concentration of the substance absorbing the light is governed by __________. 2) For the reaction aA  + Bb →  cC + dD the rate law is __________. 3) If a rate law is second order (reactant), doubling the reactant __________ the.
0 Views
View Answer
15.3   Algorithmic Questions 1) Given the following reaction at equilibrium, if Kc = 6.34 x 105 at 230.0°C, Kp = __________. 2NO (g)  + O2 (g)   2NO2 (g) A) 3.67 × 10-2 B) 1.53 × 104 C) 6.44 × 105 D) 2.61 × 106 E) 2.62 × 107 2) Given the following reaction at equilibrium at 450.0°C: CaCO3.
0 Views
View Answer
15.4   Short Answer Questions 1) The equilibrium-constant expression for a reaction written in one direction is the __________ of the one for the reaction written for the reverse direction.              2) If Reaction A + Reaction B = Reaction C, then Kc Reaction C = __________. 3) If the value for the equilibrium.
0 Views
View Answer
13.4   Short Answer Questions 1) The formula weight of FeCl3.6H2O is __________. 2) Water (H2O) and the alcohol methanol (CH3OH) are infinitely soluble in each other. The primary intermolecular force responsible for this is __________. 3) For a dilute aqueous solution, a concentration of 1 ppm also corresponds to a concentration of 1.
0 Views
View Answer