Chapter 9: Reaction Rates and Equilibrium

Chapter 9: Reaction Rates and EquilibriumDue Apr 17 at 11:59pmPoints 12Questions 12Available Apr 11 at 12am - Apr 17 at 11:59pmTime Limit NoneThis quiz is no longer available as the course has been concluded.Question 11 ptsWhat is the role of a catalyst in a chemical reaction?It increases the activation energy.It decreases the activation energy.It has no effect on the activation energy.It changes the equilibrium constant (K) of the reaction. Question 21 ptsWhat factors can influence the reaction rate of a chemical reaction?Temperature, concentration of reactants, surface area, andpresence of a catalystDensity, color, pressure, and volumeMagnetic field, electronegativity, valence electrons, andmolecular shapeDistance, time, mass, and chargeQuestion 31 ptsWhat is activation energy?The energy released during a chemical reactionThe energy required to start a chemical reactionThe total internal energy of a systemThe measure of disorder or randomness in a system Question 41 ptsHow does a catalyst influence a chemical reaction?It increases the activation energy.It decreases the activation energy.It has no effect on the activation energy.It increases the reaction rate without affecting the activationenergy.Question 51 ptsWhat is the relationship between concentration and reaction rate?As concentration increases, reaction rate decreases.As concentration increases, reaction rate increases.Concentration has no effect on reaction rate.Reaction rate is only influenced by temperature. Question 61 ptsWhat is the definition of chemical equilibrium?The point in a reaction when all reactants are used upThe point in a reaction when the concentration of reactantsequals the concentration of productsThe point in a reaction when reactants and products coexistwithout any change in concentrationThe point in a reaction when a catalyst is addedQuestion 71 ptsWhat does the equilibrium constant ((K)) indicate about a chemicalreaction at equilibrium?(K) greater than 1 indicates the reaction favors products, while(K) less than 1 favors reactants.(K) greater than 1 indicates the reaction favors reactants, while(K) less than 1 favors products.(K) has no relation to the direction of the reaction.(K) is always equal to 1 at equilibrium. Question 81 ptsWhat does a large value of (K) indicate about a chemical reaction atequilibrium?The reaction strongly favors products.The reaction strongly favors reactants.The reaction is at equilibrium.(K) cannot be large.Question 91 ptsHow does the addition of a catalyst impact the position ofequilibrium in a reaction?It shifts the equilibrium to the left.It shifts the equilibrium to the right.It has no effect on the position of equilibrium.It destabilizes the equilibrium. Question 101 ptsHow does an increase in temperature influence the position ofequilibrium in an endothermic reaction?It shifts the equilibrium to the left.It shifts the equilibrium to the right.It has no effect on the position of equilibrium.It destabilizes the equilibrium.Question 111 ptsHow does an increase in pressure influence the position ofequilibrium in a reaction involving gases?It shifts the equilibrium to the left.It shifts the equilibrium to the right.It has no effect on the position of equilibrium.It destabilizes the equilibrium. Question 121 ptsHow does Le Chatelier's principle explain the response of a system toa disturbance at equilibrium?The system responds to counteract the disturbance and restoreequilibrium.The system enhances the disturbance to reach a new equilibrium.The system ignores the disturbance.Le Chatelier's principle is not applicable to chemical reactions.Question 131 ptsWhat is the effect of adding more reactants to a system atequilibrium?The reaction shifts to the left to consume the additionalreactants.The reaction shifts to the right to produce more products.The concentration of products decreases.The reaction stops. Question 141 ptsHow does the removal of products from a system at equilibriumaffect the position of equilibrium?The reaction shifts to the left to produce more products.The reaction shifts to the right to replace the removed products.The concentration of reactants decreases.The reaction stops.Question 151 ptsHow does an increase in temperature affect the rate of a chemicalreaction?It decreases the reaction rate.It has no effect on the reaction rate.It increases the reaction rate.It stops the reaction.