What is the effect of a change in concentration of a reactant or product on a chemical reaction initially at equilibrium?
If a chemical reaction is at equilibrium and experiences a change in pressure, temperature, or concentration of products or reactants, the equilibrium shifts in the opposite direction to offset the change.
Which of the following changes decreases the rate of a reaction?
The activation energy of an endothermic reaction must be greater than the required H. Increased temperature generally decreases the rate of a reaction. Reaction rates are affected by concentration, collision geometry, and the presence of a catalyst.
Which of the following occurs when products are removed from a chemical reaction in solution or the gas phase at equilibrium?
Which of the following occurs when products are removed from a chemical reaction in solution or the gas phase at equilibrium? Q increases, so the equilibrium shifts to produce more products.
How do the amounts of reactants and products change after a reaction has reached chemical equilibrium?
The forward and reverse reactions continue to occur even after equilibrium has been reached. The rates of the forward and reverse reactions must be equal. The amount of reactants and products do not have to be equal. However, after equilibrium is attained, the amounts of reactants and products will be constant.
What three stresses can cause a change in the equilibrium position of a chemical system?
What three stresses can cause a change in the equilibrium position of a chemical system? stresses that upset the equilibrium of a chemical system include changes in the concentration of reactants of products, changes in temperature, and changes in pressure.
How can you control the ratio of chemicals in a equilibrium reaction?
According to Le Chatelier’s principle, adding additional reactant to a system will shift the equilibrium to the right, towards the side of the products. By the same logic, reducing the concentration of any product will also shift equilibrium to the right.
What is the effect of temperature on equilibrium constant?
Changing temperature Increasing the temperature decreases the value of the equilibrium constant. Where the forward reaction is endothermic, increasing the temperature increases the value of the equilibrium constant. The position of equilibrium also changes if you change the temperature.
What are the two factors to look for when determining if the reaction is at equilibrium?
The forward and reverse reactions proceed at the same rate. The concentrations of reactants and products do not change. The concentration of the reactants is equal to the concentration of the products. The forward and reverse reactions continue to occur.
What happens to equilibrium when pressure is increased?
According to Le Chatelier’s principle, if pressure is increased, then the equilibrium shifts to the side with the fewer number of moles of gas. For example, if the temperature is increased for an endothermic reaction, essentially a reactant is being added, so the equilibrium shifts toward products.
What will happen if you remove a product from an equilibrium system?
Chemical equilibria can be shifted by changing the conditions that the system experiences. When additional product is added, the equilibrium shifts to reactants to reduce the stress. If reactant or product is removed, the equilibrium shifts to make more reactant or product, respectively, to make up for the loss.
What will happen to the chemical equilibrium of AgNO3 is added?
What will happen to the chemical equilibrium if AgNO3 is added? The chemical equilibrium of the system shifts to the left. The equilibrium will shift to the left to favor the reverse reaction.
In which of the following equilibrium change in pressure will not affect the equilibrium?
Volume change is accompanied with pressure change. A reaction in which the total number of moles of gaseous reactants is equal to the total number of moles of gaseous products, the change in pressure will not affect the position of the equilibrium.
What will happen to the chemical equilibrium if NH4Cl is added to this solution?
What will happen to the chemical equilibrium if NH4Cl is added to this solution? The chemical equilibrium will shift to the left. The equilibrium will shift to the left to favor the reverse reaction.
What happens to equilibrium when inert gas is added?
When an inert gas is added to the system in equilibrium at constant pressure, then the total volume will increase. Hence, the number of moles per unit volume of various reactants and products will decrease. Hence, the equilibrium will shift towards the direction in which there is increase in number of moles of gases.
How does concentration affect the equilibrium?
If the concentration of a substance is changed, the equilibrium will shift to minimise the effect of that change. If the concentration of a reactant is increased the equilibrium will shift in the direction of the reaction that uses the reactants, so that the reactant concentration decreases.
How do acids and bases affect equilibrium?
Weak acids only dissociate partially in water. Their conjugate bases are strong. In any acid-base reaction, the equilibrium will favor the reaction that moves the proton to the stronger base. This equilibrium constant is referred to as the ion-product constant for water, Kw.
How do you know if equilibrium lies left or right?
We compare Q and K to determine which direction the reaction will proceed to obtain equilibrium. If Q is greater than K, the system will shift to the left. If Q is less than K, the system will shift to the right. If Q is equal to K than the system is already at equilibrium so it will not shift in either direction.
Which side of reaction is favored?
When the forward reaction is favored, the concentrations of products increase, while the concentrations of reactants decrease. When the reverse reaction is favored, the concentrations of the products decrease, while the concentrations of reactants increase.
How do you know if equilibrium favors your product?
A comparison of Q with K indicates which way the reaction shifts and which side of the reaction is favored:
- If Q>K, then the reaction favors the reactants.
- If Qfavors the products.
- If Q=K, then the reaction is already at equilibrium.
What happens to equilibrium constant when reaction is doubled?
For a reversible reaction, even if the concentration of the reactants is doubled, the value of the equilibrium constant for the reaction will remain the same.
How do you write an equilibrium constant expression?
For gases, the equilibrium constant expression can be written as the ratio of the partial pressures of the products to the partial pressures of the reactants, each raised to a power matching its coefficient in the chemical equation.
What are the applications of equilibrium constant?
The equilibrium constant can help us understand whether the reaction tends to have a higher concentration of products or reactants at equilibrium.
What are the two main conditions for equilibrium?
Conditions for equilibrium require that the sum of all external forces acting on the body is zero (first condition of equilibrium), and the sum of all external torques from external forces is zero (second condition of equilibrium). These two conditions must be simultaneously satisfied in equilibrium.
Is equilibrium a good thing?
There is nothing inherently good or bad about equilibrium. Equilibrium exists whenever the quantity of a good demanded is just equal to the quantity of the good supplied. (Note: it is NOT when supply equals demand—it is when a point on the demand curve just touches a point on the supply curve.)
What are the laws of equilibrium?
In a system at equilibrium, at a fixed temperature, the product of the equilibrium concentration of the products divided by the product of the concentrations of the reactants, each being raised to the coefficient of the substance in the equation, must be equal to a constant.