Chemistry Chemistry Practice Problems Solutions Library

Le Chatelier's Principle Solutions Library

Access 176 Le Chatelier's Principle video and text solutions to help you complete your homework. Need to revisit the concept? Watch our Le Chatelier's Principle learn videos.

Browse Solutions

176 solutions

Le Chatelier's Principle

Q. Classify each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. a) O2 in the ...

Solved • Jun 16, 2020

Le Chatelier's Principle

Q. Here is the chemical reaction that represents solid lead sulfate dissolving in water:PbSO4(s) ⇌ Pb2+(aq) + SO42−(aq)Ksp = 1.8 × 10−8In which of the...

Solved • Apr 30, 2020

Le Chatelier's Principle

Q. Here is the chemical reaction that represents solid lead sulfate dissolving in water:PbSO4(s) ⇌ Pb2+(aq) + SO42−(aq)Ksp = 1.8 × 10−8Which of the fo...

Solved • Apr 30, 2020

Le Chatelier's Principle

Q. For the generic equilibrium HA(aq) ⇌ H+(aq) + A-(aq), which of these statements is true? Select one: a. If you add the soluble salt KA to a solutio...

Solved • Apr 27, 2020

Le Chatelier's Principle

Q. Le Châtelier's principle states that if a stress is applied to a system at equilibrium, the system will shift to relieve that stress. This is true ...

Solved • Apr 27, 2020

Le Chatelier's Principle

Q. Consider the following system at equilibrium. 2CO(g)+O2(g) ↔ 2CO2(g)1. How will increasing the concentration of CO shift the equilibrium?A) to the ...

Solved • Apr 13, 2020

Le Chatelier's Principle

Q. A generic gas, X, is placed in a sealed glass jar and decomposes to from gaseous Y and solid Z.2X(g) ⇌ Y(g) + Z(s)How are these equilibrium quantit...

Solved • Mar 30, 2020

Le Chatelier's Principle

Q. Consider a galvanic cell that uses the reaction4H3O+ (aq) + 4I- (aq) + O2 (g) → 2I2 (s) 6H2O (l).The equilibrium constant for the reaction at 125 °...

Solved • Mar 16, 2020

Le Chatelier's Principle

Q. Consider the Potential Energy vs. Reaction Coordinate diagram shown to the right. For each of the following questions, circle the best answer.If th...

Solved • Mar 16, 2020

Le Chatelier's Principle

Q. Consider the following equilibrium:A(g) + B2(g) ⇌ AB2(g);            ∆H = -92 kJThe concentration of A at equilibrium may be increased byA) decreas...

Solved • Feb 17, 2020

Le Chatelier's Principle

Q. Which of the following reactions would shift to favor the reactant side by doubling the volume of the container?A. CaCO3 (s) ⇌ CaO (s) + CO2 (g)B. ...

Solved • Feb 10, 2020

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium in a closed container.4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g) ΔH = +64.5 kJ/molDecreasing the volum...

Solved • Jan 24, 2020

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium in a closed container.4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g) ΔH = +64.5 kJ/molIncreasing the tempe...

Solved • Jan 24, 2020

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium in a closed container.4 NH3 (g) + 3 O2(g) ⇌ 2 N2(g) + 6 H2O(g) ΔH = +64.5 kJ/molIncreasing the O2 pa...

Solved • Jan 24, 2020

Le Chatelier's Principle

Q. An important step in the industrial production of hydrogen is the reaction of carbon monoxide with water (i.e. the water gas shift reaction):CO (g)...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I2, HI, and Cl2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I2 (s)...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. Four substances (HCl, I 2, HI, and Cl 2) are mixed in a reaction vessel and allowed to reach equilibrium in the following reaction:2 HCl (g) + I 2 ...

Solved • Dec 20, 2019

Le Chatelier's Principle

Q. The table below lists the equilibrium concentrations for H 2(g), I2(g), and HI(g) in the given reaction.H2 (g) + I2 (g) ⇌ 2HI (g)Is the reaction is...

Solved • Dec 19, 2019

Le Chatelier's Principle

Q. For the gas phase reaction N2 + 3 H2 ⇌ 2 NH3 ΔH° = -92 kJ for the forward reaction. In order to decrease the yield of NH3, the reaction should be r...

Solved • Dec 19, 2019

Le Chatelier's Principle

Q. For the exothermic reaction 4 NH3(g) + 7 O2(g) => 4 NO2(g) + 6 H2O(g) which change will increase the quantity of NO2 in the mixture?a. decreasin...

Solved • Dec 19, 2019

Le Chatelier's Principle

Q. Consider the following system at equilibrium:2 NH3(g) ⇌ N2(g) + 3 H2(g)     ΔHrxn = 92.94 kJWhich of the following changes will shift the equilibri...

Solved • Nov 18, 2019

Le Chatelier's Principle

Q. The reaction      2 NO2(g) ⇌ N2O4(g)is exothermic. This means that:A. Kc will not change if the temperature is increasedB. Kc will be negativeC. Kc...

Solved • Nov 12, 2019

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium:2 CO2(g) ⇌ 2 CO(g) + O2(g)                ∆H° = –514 kJThe prediction is that adding O2(g) to the re...

Solved • Nov 12, 2019

Le Chatelier's Principle

Q. Increasing the temperature of a system at equilibriuma. favors the endothermic reaction and increases the rate of the endothermic and exothermic re...

Solved • Nov 12, 2019

Le Chatelier's Principle

Q. If some forms of "stress" (adding, removing, heating, cooling, changing volume) is applied to the exothermic reaction, 2 CO(g) + O2(g) ⇋ 2 CO2(g), ...

Solved • Nov 11, 2019

Le Chatelier's Principle

Q. Consider the following reaction: 2S(s) + 3O 2(g) → 2SO3(g) + heatThe rate of this reaction could be increased byA. Decreasing temperatureB. Adding ...

Solved • Aug 26, 2019

Le Chatelier's Principle

Q. Consider the following reaction:2MnO4-(aq) + 5C 2O42-(aq) + 16H +(aq) → 2Mn 2+(aq) + 10CO2(g) + 8H2O(l)The rate of decomposition of the oxalate ion...

Solved • Aug 26, 2019

Le Chatelier's Principle

Q. CoCl42-(aq, blue) + 6H2O(l) ⇌ Co(H2O)62-(aq, pink) + 4Cl-(aq) [REVERSIBLE EQ.]QUESTION: When the pink equilibrium solution formed from CoCl2 was pl...

Solved • Aug 2, 2019

Le Chatelier's Principle

Q. Acetic acid can be manufactured by combining methanol with carbon monoxide, an example of a  carbonylation reaction:CH3 OH( l ) + CO( g )  →  3 COO...

Solved • Jan 3, 2019

Le Chatelier's Principle

Q. Effect of temperature and pressure on NH3 yield in the Haber process.Each mixture was produced by starting with a 3:1 molar mixture of H2 and N2.At...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Water molecules in the atmosphere can form hydrogen-bonded dimers, (H2O) 2. The presence of these dimers is thought to be important in the nucleati...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. How do the following changes affect the value of the equilibrium constant for a gas-phase exothermic reaction:removal of a reactant

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the following reaction in chemical equilibrium: 2 BrNO(g) ⇌ 2 NO(g) + Br2(g)2 m BrNO(g); ightleftharpoons;2 NO(g) +  Br_{2}(g)What is the ...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: 2 BrNO(g) ⇌ 2 NO(g) + Br2(g)Predict whether the reaction will shift left, shift right, or remain un...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. The reaction A(g) ⇌ 2B(g) has an equilibrium constant of Kc = 1.0 at a given temperature. If a reaction vessel contains equal initial amounts (in m...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. The decomposition of NH4HS is endothermic: NH4HS(s) ⇌ NH3(g) + H2S(g)Which change to an equilibrium mixture of this reaction results in the formati...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. The following reaction is endothermic: C(s) + CO2(g) ⇌ 2 CO(g)Predict the effect (shift right, shift left, or no effect) of decreasing the reaction...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. The following reaction is exothermic: C6H12O6(s) + 6 O2(g) ⇌ 6 CO2(g) + 6 H2O(g)Predict the effect (shift right, shift left, or no effect) of incre...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Coal, which is primarily carbon, can be converted to natural gas, primarily CH4, by the following exothermic reaction:C(s) + 2 H2(g) ⇌ CH4(g)Which ...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Coal can be used to generate hydrogen gas (a potential fuel) by the following endothermic reaction:C(s) + H2O(g) ⇌ CO(g) + H2(g)If this reaction mi...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: CO(g) + Cl2(g) ⇌ COCl2(g)Predict whether the reaction will shift left, shift right, or remain uncha...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: CO(g) + Cl2(g) ⇌ COCl2(g)Predict whether the reaction will shift left, shift right, or remain uncha...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: CO(g) + Cl2(g) ⇌ COCl2(g)Predict whether the reaction will shift left, shift right, or remain uncha...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. H2 and I2 are combined in a flask and allowed to react according to the following reaction: H2(g) + I2(g) ⇌ 2 HI(g)Examine the figures (sequential ...

Solved • Dec 11, 2018

Le Chatelier's Principle

Q. Consider the reaction2 NO2 (g) ⇌ N2O4 (g)For each of the following mixtures of reactants and products at 25°C, predict the direction in which the r...

Solved • Nov 30, 2018

Le Chatelier's Principle

Q. Glauber’s salt, Na 2SO4·10H2O, was used by J. R. Glauber in the 17 th century as a medicinal agent. At 25°C, Kp = 4.08×10−25 for the loss of waters...

Solved • Nov 8, 2018

Le Chatelier's Principle

Q. Predict the effect of increasing the container volume on the amounts of the reactant and product in the following reaction: (b) CH4(g) + NH3(g) ⇌ H...

Solved • Nov 7, 2018

Le Chatelier's Principle

Q. Sodium bicarbonate undergoes thermal decomposition according to the reaction: 2NaHCO3(s) ⇌ Na2CO3(s) + CO2(g) + H2O(g) How does the equilibrium pos...

Solved • Nov 7, 2018

Le Chatelier's Principle

Q. Sodium bicarbonate undergoes thermal decomposition according to the reaction: 2NaHCO3(s) ⇌ Na2CO3(s) + CO2(g) + H2O(g) How does the equilibrium pos...

Solved • Nov 7, 2018

Le Chatelier's Principle

Q. Consider the following exothermic reaction at equilibrium:N2(g) + 3H2(g) ⇌ 2NH3(g)Predict how the following changes affect the number of moles of e...

Solved • Nov 5, 2018

Le Chatelier's Principle

Q. The synthesis of ammonia gas from nitrogen gas and hydrogen gas represents a classic case in which a knowledge of kinetics and equilibrium was used...

Solved • Nov 5, 2018

Le Chatelier's Principle

Q. The synthesis of ammonia gas from nitrogen gas and hydrogen gas represents a classic case in which a knowledge of kinetics and equilibrium was used...

Solved • Nov 5, 2018

Le Chatelier's Principle

Q. Chromium(VI) forms two different oxyanions, the orange dichromate ion, Cr 2O72-, and the yellow chromate ion, CrO42-. (See the following photos.) T...

Solved • Nov 5, 2018

Le Chatelier's Principle

Q. Old-fashioned “smelling salts” consist of ammonium carbonate, (NH 4)2CO3. The reaction for the decomposition of ammonium carbonate(NH4)2CO3(s) ⇌ 2N...

Solved • Nov 4, 2018

Le Chatelier's Principle

Q. What will happen to the number of moles of SO 3 in equilibrium with SO2 and O2 in the reaction2SO3(g) ⇌ 2SO2(g) + O2(g)in each of the following cas...

Solved • Nov 4, 2018

Le Chatelier's Principle

Q. An important reaction in the commercial production of hydrogen isCO(g) + H2O(g) ⇌ H2(g) + CO2(g)How will this system at equilibrium shift in each o...

Solved • Nov 4, 2018

Le Chatelier's Principle

Q. Predict the shift in the equilibrium position that will occur for each of the following reactions when the volume of the reaction container is incr...

Solved • Nov 4, 2018

Le Chatelier's Principle

Q. The equilibrium constant is 0.0900 at 25ºC for the reaction H2O(g) + Cl2O(g) ⇌ 2HOCl(g)For which of the following sets of conditions is the system ...

Solved • Nov 4, 2018

Le Chatelier's Principle

Q. The binding of oxygen by hemoglobin (Hb), giving oxyhemoglobin (HbO2), is partially regulated by the concentration of H3O+ and dissolved CO2 in the...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Additional solid silver sulfate, a slightly soluble solid, is added to a solution of silver ion and sulfate ion at equilibrium with solid silver su...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Acetic acid is a weak acid that react with water according to this equation:CH3 CO2 H(aq) + H2O(aq) ⇌ H3O+(aq) + CH3CO2 −(aq)Will the following inc...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Ammonia is a weak base that react with water according to this equation:NH3(aq) + H2 O(l) ⇌ NH4 +(aq) + OH−(aq)Will the following increase the perc...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Pure iron metal can be produced by the reduction of iron(III) oxide with hydrogen gas. (a) Write the expression for the equilibrium constant (Kc) f...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Nitrogen and oxygen react at high temperatures.(a) Write the expression for the equilibrium constant (Kc) for the reversible reactionN2(g) + O2(g) ...

Solved • Nov 1, 2018

Le Chatelier's Principle

Q. Suggest four ways in which the concentration of PH 3 could be increased in an equilibrium described by the following equation:P4(g) + 6H2(g) ⇌ 4PH3...

Solved • Oct 31, 2018

Le Chatelier's Principle

Q. Suggest four ways in which the concentration of hydrazine, N2H4, could be increased in an equilibrium described by the following equation:N2(g) + 2...

Solved • Oct 31, 2018

Le Chatelier's Principle

Q. A necessary step in the manufacture of sulfuric acid is the formation of sulfur trioxide, SO3, from sulfur dioxide, SO2, and oxygen, O2, shown here...

Solved • Oct 31, 2018

Le Chatelier's Principle

Q. Consider this system at equilibrium. PCl3(g) + Cl2(g) ⇌ PCI5(g) + heat How will the system respond to a temperature increase? a. shift leftb. shift...

Solved • Aug 13, 2018

Le Chatelier's Principle

Q. As the temperature of an endothermic equilibrium reaction increases, the equilibrium will shift to the left.a. Trueb. False 

Solved • Jul 24, 2018

Le Chatelier's Principle

Q.  Consider the following system at equilibrium.CaCl2 (s) ⇌ Ca2+ (aq) + 2Cl- (aq)1) How will adding more CaCl2 shift the equilibrium?      a) to the ...

Solved • Jul 3, 2018

Le Chatelier's Principle

Q. 2AB (aq) ⇌ A 2 (aq) B2 (aq)  The above reaction is at equilibrium. I begin to remove A 2 from the system. How does this affect equilibrium? 

Solved • Jun 25, 2018

Le Chatelier's Principle

Q. At a certain temperature, the equilibrium constant, K c, for the reaction Cl2(g) ⇌ 2Cl(g) is 5.92 x 104. A. If 2.77 g of Cl 2 are placed in a 2.50 ...

Solved • Jun 12, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: 2CO2 (g) <---> 2CO (g) + O2 (g) ΔH° = -514 kJ Le Chatelier's principle predicts that the eq...

Solved • Mar 21, 2018

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium: 2CO2 (g) <---> 2CO (g) + O2 (g) ΔH° = -514 kJ Le Chatelier's principle predicts that an inc...

Solved • Mar 21, 2018

Le Chatelier's Principle

Q. Coal, which is primarily carbon, can be converted to natural gas, primarily CH 4, by the exothermic reaction:C(s) + 2H2(g) ⇌ CH4(g)Which change wil...

Solved • Mar 20, 2018

Le Chatelier's Principle

Q. Consider the following system as equilibrium PbI2(s) ⇌ Pb2+(aq) + 2I-(aq)How will adding more PbI2 shift the equilibrium?How will removing some Pb2...

Solved • Mar 20, 2018

Le Chatelier's Principle

Q. Consider the following system at equilibrium. S(s) + O2(g) ⇌ SO2(g) a. How will adding more S(s) shift the equilibrium? b. How will removing som...

Solved • Mar 6, 2018

Le Chatelier's Principle

Q. Consider the following system at equilibrium.2CO (g) + O2 (g) ⇌ 2CO2(g)How will increasing the concentration of CO 2 shift the equilibrium?a) to th...

Solved • Feb 22, 2018

Le Chatelier's Principle

Q. Consider the following system at equilibrium. 2CO(g) + O2(g) ⇌ 2CO2(g) How will increasing the concentration of CO shift the equilibrium? a) to ...

Solved • Feb 21, 2018

Le Chatelier's Principle

Q. For the following reaction, which condition will shift the equilibrium to the right? a) increasing the temperature b) increasing the pressure c)...

Solved • Aug 17, 2017

Le Chatelier's Principle

Q. Consider the following reactions at equilibrium. In which cases will the reaction proceed to the right by decreasing the pressure? a) 1, 2, 3 b) ...

Solved • Aug 17, 2017

Le Chatelier's Principle

Q. CaCO3 decomposes by the following reaction in a closed container with excess CaCO3 remaining once the reaction reaches equilibrium. Which change wi...

Solved • Aug 7, 2017

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system?2 H2S(g) + 3 O2(g...

Solved • Jun 28, 2017

Le Chatelier's Principle

Q. For the following reaction at equilibrium, which gives a change that will shift the position of equilibrium to favor formation of more products? 2...

Solved • Jun 26, 2017

Le Chatelier's Principle

Q. For an exothermic reaction, what would happen to the numerical value of Kc, if we increase the temperature at constant pressure? 1. Kc would not c...

Solved • Jun 22, 2017

Le Chatelier's Principle

Q. Consider this reaction at equilibrium: C(s) + H2O(g) ⇌ CO(g) + H2(g) Predict whether the reaction will shift left, shift right, or remain unchang...

Solved • Jun 16, 2017

Le Chatelier's Principle

Q. Consider the following reaction at equilibrium6A (s) + 7B (g) ⇌ 5C (g) + 8D (l)           ΔH = -3226.6 kJ/molWhich one of the following statements ...

Solved • Apr 28, 2017

Le Chatelier's Principle

Q. Which direction would the following endothermic reaction shift - (to the left (←) or to the right (→) or no change (0) after each of the following ...

Solved • Apr 20, 2017

Le Chatelier's Principle

Q. Consider the system: 2 N2O5(g) ⇌ 2N2O4(g) + O2(g) at equilibrium at 25°C. If this is an exothermic reaction and the temperature was raised, would...

Solved • Apr 18, 2017

Le Chatelier's Principle

Q. What happens to the concentration of NO(g) when the total pressure on the reaction below is increased (by compression) when it is at equilibrium? ...

Solved • Apr 18, 2017

Le Chatelier's Principle

Q. Consider the endothermic reaction shown below. Choose the change that would shift the equilibrium toward the reactants. C2H4(g) + I2(g) ⇌ C2H4I2(g...

Solved • Apr 18, 2017

Le Chatelier's Principle

Q. Now let’s consider the overall reaction as an equilibrium process, carried out at a lower temperature such that H 2O is obtained as a liquid. 2NO(...

Solved • Mar 28, 2017