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Le Chatelier's Principle

Q. Ethane, C 2H 6, can be formed by reacting acetylene, C 2H 2, with hydrogen gas as follows:        C 2H 2(g) + H 2(g) ⇌ C 2H 6(g)   Exothermic      ...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. For the reaction  CO(g) + 3H 2(g) ⇌ CH 4(g) + H 2O(g)          q = -206 kJ         What conditions favor maximum conversion of reactants to produc...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. Consider the following system at equilibrium: NO(g) + SO 3(g) ⇌  NO 2(g) + SO 2(g)        What change will cause the equilibrium to shift to form m...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. Consider the following system at equilibrium:  CH 4(g) + 2H 2O(g) ⇌  CO 2(g) + 4H 2(g)        What change will cause the equilibrium to shift to fo...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. The position of equilibrium would not be appreciably affected by changes in the volume of the container for

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. Which one of the following changes has  no effect on the position of the equilibrium?A) concentration change                     B) volume change  ...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. For a given reaction, which of the following statements can be made about the value of the equilibrium constant?     A)    It always remains the s...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. The process, 2 NH 3(g) ----> heat + N 2(g) + 3 H 2(g), is at equilibrium at a given temperature.  Which of the following changes will change the...

Solved • Mar 23, 2017

Le Chatelier's Principle

Q. Which change in the system will drive equilibrium to the left in the reaction below?N 2O 5(g) ⇌ NO 2(g) + NO 3(g)        A) decrease the amount of ...

Solved • Mar 22, 2017

Le Chatelier's Principle

Q. C (s) + H 2O (g) → CO (g) + H 2 (g)             ∆H > 0 For the system above at equilibrium, which changes will increase the amount of H 2 (g)? ...

Solved • Mar 22, 2017

Le Chatelier's Principle

Q. For the exothermic reaction: 4 NH 3 (g) + 7 O 2 (g) → 4 NO 2 (g) + 6 H 2O (g), which change will increase the quantity of NO 2 in the mixture?A) in...

Solved • Mar 22, 2017

Le Chatelier's Principle

Q. Consider the endothermic reaction: CaCO3 (s) + 2 H+ (aq) ↔ Ca2+ (aq) + CO2 (g) +H2O (l). A vessel contains all of the substances at equilibrium. Wh...

Solved • Mar 10, 2017

Le Chatelier's Principle

Q. The reaction for the synthesis of ammonia N2(g) + 3H2(g) ⇌ 2NH3(g) is exothermic. To obtain the greatest yield of NH3, this reaction should be carr...

Solved • Mar 10, 2017

Le Chatelier's Principle

Q. PbCl2 (s) ↔ Pb2+ (aq) + 2 Cl - (aq) (This process is ENDOTHERMIC)1. If we add NaCl to the solution.2. If we raise the temperature by adding heat to...

Solved • Mar 1, 2017

Le Chatelier's Principle

Q. Suppose the exothermic reaction2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g)comes to equilibrium. Then we increase the temperature and decrease the total pressure...

Solved • Feb 27, 2017

Le Chatelier's Principle

Q. Consider the following system at equilibrium.H2 (g) + I2 (g) ⇌ 2 HI (g) + heatWhich response includes all the following that will shift the equilib...

Solved • Feb 27, 2017

Le Chatelier's Principle

Q. Consider the reactionNi (s) + 4 CO (g) → Ni(CO)4 (g).At 30°C and PCO = 1 atm, Ni reacts with CO (g) to form Ni(CO) 4 (g). At 200°C, Ni(CO)4 (g) dec...

Solved • Feb 27, 2017

Le Chatelier's Principle

Q. Consider the combustion of glucose:C6H12O6 (s) + 6 O2 (g) ↔ 6 CO2 (g) + 6 H2O (g)     ΔH = −2,800 kJ/molWhich condition would result in the product...

Solved • Feb 27, 2017

Le Chatelier's Principle

Q. H2(g) is an important fuel source for hydrogen powered vehicles and a reagent for the Haber-Bosch process. A majority of H2 is generated using equi...

Solved • Jan 27, 2017

Le Chatelier's Principle

Q. One of the most important industrial sources of ethanol is the reaction of steam with ethane derived from crude oil. The reaction is represented by...

Solved • Dec 23, 2016

Le Chatelier's Principle

Q. For the below reaction, which of the statements will shift the equilibrium to the left (make more reactants).PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)         ...

Solved • Oct 17, 2016

Le Chatelier's Principle

Q. The following data was collected for the following reaction at equilibrium.A (s)  + 2 B  (g)  ⇌ 3 C (g) +  D (g)At 55oC, K is 3.9 x 10 -3 and at 10...

Solved • Sep 22, 2016

Le Chatelier's Principle

Q. Baking soda (sodium bicarbonate) undergoes spontaneous decomposition at high enough temperatures to produce the following equation:2 NaHCO3 (s)  ⇌ ...

Solved • Sep 22, 2016

Le Chatelier's Principle

Q. Consider the gas-phase reaction:2 CO (g)  +  O2 (g) ⇌ 2 CO2 (g)Predict the shift in the equilibrium position when argon gas is added to the mixture...

Solved • Sep 22, 2016

Le Chatelier's Principle

Q. The reaction for the synthesis of ammonia  N2(g) + 3H2(g) ⇌ 2NH3(g)  is exothermic. To obtain the greatest yield of NH3, this reaction should be ...

Solved • Sep 21, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium. What effect will decreasing the temperature have on the system? More than one choice may be correct...

Solved • Aug 27, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium. What effect will adding some C have on the system?CO2(g) + C(graphite) ⇌ 2CO(g)A)  No effect will b...

Solved • Aug 26, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium. What effect will raising the CO2 pressure have on the system?CaO(s) + CO2(g) ⇌ CaCO3(s)A) No effect...

Solved • Aug 26, 2016

Le Chatelier's Principle

Q. Consider the following exothermic reaction:C2H4(g) + Cl2(g) ⇌ C2H4Cl2(g)If you were a chemist trying to maximize the amount of C2H4Cl2 produced, wh...

Solved • Aug 26, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2KClO3(s) ⇌ 2KCl(s) + 3O2(g)The following changes are made in the conditions:1) Oxygen is added to t...

Solved • Aug 26, 2016

Le Chatelier's Principle

Q. Which statement(s) about the equilibrium constant, K c, is/are true?i. Kc changes as the concentration of a reactant changesii. Kc changes if the r...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. Which of the following procedures will shift the equilibrium reaction to the right?A (s) + 2 B (g) ⇌ 3 C (s) + D (g)   ΔH° = - 25.2kJA. cooling the...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. Which of the following changes to a system at equilibrium will force the reaction to shift towards the products6 A (s) + 3 B2 (g) ⇌ 4 AB (g) + A2B2...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. Coal, which is primarily carbon, can be converted to natural gas, CH4, by the following reaction: C (s) + 2 H2 (g) ⇌ CH4 (g)   ΔHo= -74.6kJWhich of...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. In which of these gas-phase equilibria is the yield of products increased by increasing the total pressure on the reaction mixture?A) CO(g) + H2O(g...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. A solution of potassium hydroxide is in equilibrium with undissolved solute at 45°C. What will happen if the temperature is raised to 50°C?(ΔHsoln ...

Solved • Aug 25, 2016

Le Chatelier's Principle

Q. Consider the following exothermic reaction. Which of the conditions will increase the value of the equilibrium constant, Kc? 4 NH3(g) + 5 O2(g) ⇌ ...

Solved • May 16, 2016

Le Chatelier's Principle

Q. For the reaction below, which change in conditions made to a system at equilibrium will result in a net reaction to the right towards products? C(...

Solved • May 16, 2016

Le Chatelier's Principle

Q. Which of the following changes in reaction conditions will alter the composition of an equilibrium mixture of gases? a) addition of reactants b) ...

Solved • May 16, 2016

Le Chatelier's Principle

Q. Solid carbon and gaseous carbon dioxide are placed in a closed vessel and allowed to come to equilibrium at a high temperature according to this eq...

Solved • May 10, 2016

Le Chatelier's Principle

Q. The numerical value of the equilibrium constant for any chemical change is affected by changing thea) nature of the catalyst.b) concentration of th...

Solved • May 10, 2016

Le Chatelier's Principle

Q. In which reaction would an increase in pressure at constant temperature have no effect on the relative amounts of the subtances present in the equi...

Solved • May 10, 2016

Le Chatelier's Principle

Q. Consider this reaction.heat + CaSO3 (s) ⇌ CaO (s) + SO2 (g)What change will cause an increase in the pressure of SO 2 (g) when equilibrium is re-es...

Solved • May 10, 2016

Le Chatelier's Principle

Q. Consider this reaction, carried out at constant temperature and volume.2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g) What is the effect of removing some SO3 from ...

Solved • May 10, 2016

Le Chatelier's Principle

Q. Consider this reaction, carried out at constant volume.2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g)           Δ H = -198kJThe concentration of O2 (g) at equilibr...

Solved • May 10, 2016

Le Chatelier's Principle

Q. The reversible reaction2 H2 (g) + CO (g) ⇋ CH3OH (g) + heatis carried out by mixing carbon monoxide and hydrogen gases in a closed vessel under hig...

Solved • May 10, 2016

Le Chatelier's Principle

Q. Which factors will affect both the position of equilibrium and the value of the equilibrium constant for this reaction?N2 (g) + 3 H2 (g) ⇌ 2 NH3 (g...

Solved • May 10, 2016

Le Chatelier's Principle

Q. Consider this gas-phase reaction. H2 (g) + I2 (g) ⇋ 2 HI (g)                Δ H = 53 kJ Which reaction characteristics will be affected by a chan...

Solved • May 10, 2016

Le Chatelier's Principle

Q. A solution of sodium acetate in water is observed to become more alkaline as the temperature is raised. Which conclusion can be drawn? This is the ...

Solved • Apr 26, 2016

Le Chatelier's Principle

Q. Consider this reaction, carried out at constant temperature and volume.PCl5(g) ⇌ PCl3(g) + Cl2(g)How can the position of equilibrium for this react...

Solved • Apr 26, 2016

Le Chatelier's Principle

Q. What will be the effect of increasing the temperature of reactants that are known to undergo an endothermic reaction?(A) Both the rate of reaction ...

Solved • Apr 26, 2016

Le Chatelier's Principle

Q. Consider the reaction: 2SO2 (g) + O2 (g) ⟺ 2SO3 (g) ΔH = -198.2 kJ/mol. What would be the effect on the reaction if we were to:a. decrease the temp...

Solved • Apr 18, 2016

Le Chatelier's Principle

Q. Consider the reaction: 2SO2 (g) + O2 (g) ⇌ 2SO3 (g) ΔH = -198.2 kJ/mol. What would be the effect on the reaction if we were to: a. increase the te...

Solved • Apr 18, 2016

Le Chatelier's Principle

Q. The reactionCO(g) + 2H2(g) ⇌ CH3OH(g)is endothermic. Which of the following statements about this reaction is true?a) Raising the temperature will ...

Solved • Apr 12, 2016

Le Chatelier's Principle

Q. The reaction2NaHCO3(s) ⇌ Na2CO3(s) + H2O(g) + CO2(g)is endothermic. What would you do in order to maximize the yield of Na 2CO3(s)?a) Lower the tem...

Solved • Apr 12, 2016

Le Chatelier's Principle

Q. The reaction4PH3(g) ⇌ P4(s) + 6H2(g)is endothermic. In order to maximize the amount of H 2 present at equilibrium,a) raise the temperature and incr...

Solved • Apr 12, 2016

Le Chatelier's Principle

Q. Silane (SiH4) has not been observed in the atmosphere of Saturn. The absence of silane is believed to be due to the reactionSiH4(g) + Mg(OH)2(g) + ...

Solved • Apr 12, 2016

Le Chatelier's Principle

Q. What would you do in order to maximize the yield of SO 3 from the following reaction:2SO2(g) + O2(g) ⇌ 2SO3(g)      ΔH°= −197.8 kJa) Lower the temp...

Solved • Apr 12, 2016

Le Chatelier's Principle

Q.  The next three questions refer to the following exothermic gas phase process at equilibrium:2SO2(g) + O2(g) ⟺ 2SO3(g) Predict  what will happen wh...

Solved • Mar 14, 2016

Le Chatelier's Principle

Q. What is a good statement of le Chatelier's Principle?a) When dealing with polar and non-polar substances "Like dissolves like".b) "Birds of a feath...

Solved • Mar 11, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: A (g) ⟺ 2B (g)From the data shown below, determine if the forward reaction is endothermic or exothe...

Solved • Feb 24, 2016

Le Chatelier's Principle

Q. NH4Cl(s) ⇌ NH3(g) + HCl(g) is endothermic. How many of the following would cause an increase in the equilibrium pressure of HCI(g)?  An increase i...

Solved • Feb 23, 2016

Le Chatelier's Principle

Q. For reversible reactions at equilibrium, a rise in temperature will: a) decrease the rates of reactions               b) favor the endothermic re...

Solved • Feb 23, 2016

Le Chatelier's Principle

Q. For the equation,2 H2 (g) + X2 (g) ⇌ 2 H2X (g) + energyi) Write the equilibrium constant expression.  ii) Addition of argon to the above equilibriu...

Solved • Feb 22, 2016

Le Chatelier's Principle

Q. The following reaction is exothermic:Fe3+ (g) + Br - (g) ⇌ FeBr2+ (g)How will the equilibrium concentration of FeBr 2+ change if the partial pressu...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2 NH3 (g) ⇌ N2 (g) + 3 H2 (g)      ΔH° = +92.4 kJAdding N2 (g) to the system at equilibrium will ___...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2 NH3 (g) ⇌ N2 (g) + 3 H2 (g)          ΔH° = + 92.4 kJDecreasing the volume of the system at equilib...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2 NH3 (g) ⇌ N2 (g) + 3 H2 (g)                 ΔH° = + 92.4 kJIncreasing the temperature to the syste...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Which one of the following will change the value of an equilibrium constant?a) changing temperatureb) adding other substances that do not react wit...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Which of the following equilibria will shift to the left in response to a decrease in volume?a) H2 (g) + Cl2 (g) ⇌ 2 HCl (g)b) 2 SO3 (g) ⇌  2 SO2 (...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2 CO2 (g) ⇌ 2 CO (g) + O2 (g)           ΔH° = -514 kJHow can the yield of CO (g) be maximized?a) at ...

Solved • Feb 21, 2016

Le Chatelier's Principle

Q. Consider this reaction, carried out at constant volume:  2SO2(g) + O2(g)    2SO3(g)          ∆H=  –198kJ The concentration of oxygen gas at equilib...

Solved • Feb 2, 2016

Le Chatelier's Principle

Q. Given the reaction: 2 X (g) + Y (g)   ⇌    2 Z (g)                      ∆H = – 335kJ Which combination of pressure and temperature gives the highes...

Solved • Feb 2, 2016

Le Chatelier's Principle

Q. When equilibrium has been reached in the reaction: AE + CD ⇌ CE + AD + xkJ in which all substances are in solution, A. Adding AE will increase the ...

Solved • Feb 2, 2016

Le Chatelier's Principle

Q. The reaction for the formation of ammonia by direct combination is:      N2(g) + 3H2(g) ⇌ 2NH3(g)                                                  ...

Solved • Feb 2, 2016

Le Chatelier's Principle

Q. Which factors will affect both the position of equilibrium and the value of the equilibrium constantfor this reaction?           N2(g) + 3H2(g) 2NH...

Solved • Feb 2, 2016