23. What happens when a chemical reaction reaches equilibrium?The amounts of reactants and products remain constant because the reaction stops.The reaction stops because the concentration of reactants is too low to sustain it.The reaction reverses so some of the products are converted back into reactants.The rate of the forward reaction is the same as the rate of the reverse reaction.PREVIOUS23 of 25NEXTREVIEW

Chemical reaction are represented by using chemical equation. Reactants are the substance that…

A 23. What happens when a chemical reaction reaches equilibrium? The amounts of reactants and products remain constant because the reaction stops. O The reaction stops because the concentration of reactants is too low to sustain it. O The reaction reverses so some of the products are converted back into reactants. O The rate of the forward reaction is the same as the rate of the reverse reaction.

A 23. What happens when a chemical reaction reaches equilibrium? The amounts of reactants and products remain constant because the reaction stops. O The reaction stops because the concentration of reactants is too low to sustain it. O The reaction reverses so some of the products are converted back into reactants. O The rate of the forward reaction is the same as the rate of the reverse reaction.

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter17: Chemical Equilibrium

Section: Chapter Questions

Problem 1STP

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. Explain what it means that a reaction has reached a state of chemical equilibrium. Explain why equilibrium is a dynamic state: Does a reaction really “stop” when the system reaches a state of equilibrium? Explain why, once a chemical system has reached equilibrium, the concentrations of all reactants remain constant with time. Why does this constancy of concentration not contradict our picture of equilibrium as being dynamic? What happens to the rates of the forward and reverse reactions as a system proceeds to equilibrium from a starting point where only reactants are present?
. In your own words, describe what Le Châtelier’s principle tells us about how we can change the position of a reaction system at equilibrium.
. Consider the following exothermic reaction at equilibrium: N2(g)+3H2(g)2NH3(g)Predict how the following changes affect the number of moles of each component of the system after equilibrium is re-established by completing the table. Complete the table with the terms increase, decrease, or no change. N2 H2 NH3 Add N2(g) Remove H2(g) Add NH3(g) Add Ne(g) (constant V) Increase the temperature Decrease the volume (constant T) Add a catalyst
In the figure, orange fish are placed in one aquarium and green fish in an adjoining aquarium. The two tanks are separated by a removable partition that is initially closed. (a) Describe what happens in the first few minutes after the partition is opened. (b) What would you expect to see several hours later? (c) How is this system analogous to dynamic chemical equilibrium?
. The equilibrium constant for the reaction 2NOCl(g)2NO(g)+Cl2(g)has the value 9.2106at a particular temperature. The system is analyzed at equilibrium, and it is found that the concentrations of NOCl(g) and NO(g) are 0.44 M and 1.5103M. respectively. What is the concentration of Cl2(g) in the equilibrium system under these conditions?
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. For the reaction system C(s)+H2O(g)H2(g)+CO(g)which has already reached a state of equilibrium, predict the effect that each of the following changes will have on the position of the equilibrium. Tell whether the equilibrium will shift to the right, will shift to the left, or will not be affected. a. The pressure of hydrogen is increased by injecting an additional mole of hydrogen gas into the reaction vessel. b. Carbon monoxide gas is removed as it forms by use of a chemical absorbent or “scrubber.” c. An additional amount of solid carbon is added to the reaction vessel.
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The gaseous reaction 2HBr(g)H2(g)+Br2(g) is endothermic. Tell which direction the equilibrium will shift for each of the following: a.Some H2 is added. b.The temperature is increased. c.Some Br2 is removed. d.A catalyst is added. e.Some HBr is removed. f.The temperature is decreased, and some HBr is removed.
. For an equilibrium involving gaseous substances, what effect, in general terms, is realized when the volume of the system is decreased?