Le Chatelier's Principle and Concentration Changes
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Questions and Answers

How does a decrease in temperature affect an exothermic reaction?

  • Increases yield of reaction
  • Causes the reaction to stop
  • Decreases yield of reaction (correct)
  • No effect on yield of reaction

    • In gaseous reactions, what happens if there is an increase in pressure?

  • Reaction becomes irreversible
  • Equilibrium shifts to side with fewer moles of gas (correct)
  • Equilibrium shifts to side with more moles of gas
  • No effect on equilibrium

    • For a reaction that produces more moles of gas, what happens if the pressure is increased?

  • Equilibrium shifts to side with more moles of gas (correct)
  • Reaction stops
  • No effect on equilibrium
  • Equilibrium shifts to side with fewer moles of gas

    • What happens to the yield of an endothermic reaction if the temperature is decreased?

    <p>Increases yield of reaction</p> Signup and view all the answers

    When pressure decreases in a gaseous reaction, where does the equilibrium shift?

    <p>To the side with fewer moles of gas</p> Signup and view all the answers

    If a reaction produces fewer moles of gas, what happens when pressure is increased?

    <p>Equilibrium shifts to side with fewer moles of gas</p> Signup and view all the answers

    In which direction does the equilibrium shift if a reaction produces more moles of gas and pressure is increased?

    <p>Right, side with fewer moles of gas</p> Signup and view all the answers

    In a closed system, when does equilibrium occur for a reversible reaction?

    <p>When the reactions occur at exactly the same rate in each direction</p> Signup and view all the answers

    What happens when a reversible reaction reaches equilibrium in a closed system?

    <p>The rate of forward reaction equals the rate of reverse reaction</p> Signup and view all the answers

    How do changing conditions affect the relative amounts of reacting substances at equilibrium?

    <p>They determine the amounts of reactants and products at equilibrium</p> Signup and view all the answers

    If a reversible reaction is exothermic, what happens at equilibrium if the temperature is increased?

    <p>The equilibrium shifts to the right to favor the endothermic reaction</p> Signup and view all the answers

    What is the impact on equilibrium when a reversible reaction takes place in an open system?

    <p>The system will not reach equilibrium as reactants escape</p> Signup and view all the answers

    What happens to the position of equilibrium when the concentration of reactants is increased?

    <p>Shifts towards products</p> Signup and view all the answers

    How does increasing the concentration of products affect the position of equilibrium?

    <p>Shifts towards reactants</p> Signup and view all the answers

    If a reaction is endothermic and the temperature is increased, what is the effect on equilibrium?

    <p>Shifts towards products</p> Signup and view all the answers

    In Le Chatelier's principle, what does the system do when a change is made to any of the conditions of equilibrium?

    <p>Adapts to maintain the change</p> Signup and view all the answers

    For an exothermic reaction, what happens if the temperature is decreased?

    <p>Shifts towards reactants</p> Signup and view all the answers

    When a system is no longer at equilibrium due to a change in concentration, what occurs until equilibrium is reached again?

    <p>All substances' concentrations change</p> Signup and view all the answers

    In a gaseous reaction that produces the least number of molecules, what happens to the equilibrium if the pressure is increased?

    <p>Equilibrium shifts to the right side of the equation</p> Signup and view all the answers

    For a reaction producing a larger volume of gas (more moles), what happens if the pressure is decreased?

    <p>Equilibrium shifts to the left side of the equation</p> Signup and view all the answers

    How does a decrease in temperature affect the yield of an endothermic reaction?

    <p>Increases yield of reaction</p> Signup and view all the answers

    When a decrease in pressure occurs in a gaseous reaction, where does the equilibrium shift?

    <p>To the side with fewer moles of gas</p> Signup and view all the answers

    If a reaction produces fewer moles of gas, what happens when the pressure is increased?

    <p>Equilibrium shifts to the right side of the equation</p> Signup and view all the answers

    What is the effect of pressure changes on equilibrium in gaseous reactions?

    <p>Pressure affects equilibrium based on moles of gas produced</p> Signup and view all the answers

    What symbol is typically used to represent a reversible reaction?

    <p>⇌</p> Signup and view all the answers

    How can the direction of a reversible reaction be altered?

    <p>By changing the conditions, such as using hot conditions for the forward reaction</p> Signup and view all the answers

    In which type of reactions can the products react to form the original reactants?

    <p>Reversible reactions</p> Signup and view all the answers

    If a reversible reaction is endothermic in one direction, what is it in the opposite direction?

    <p>Exothermic</p> Signup and view all the answers

    What type of change occurs if a reversible reaction is endothermic one way?

    <p><strong>It is exothermic in the opposite direction</strong></p> Signup and view all the answers

    What is the relationship between an endothermic reaction and an exothermic reaction in a reversible reaction?

    <p><strong>One is endothermic, and the other is exothermic</strong></p> Signup and view all the answers

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