All changes saved 10 The rate of a reaction depends on many factors such as the concentration of the reactants. Which of the following explains why an increase in the concentration of reactants affects the rate of reaction? O The reactants move faster. There are fewer molecules present. O The activation energy is lowered. The collisions increase between the reactants.

All changes saved 10 The rate of a reaction depends on many factors such as the concentration of the reactants. Which of the following explains why an increase in the concentration of reactants affects the rate of reaction? O The reactants move faster. There are fewer molecules present. O The activation energy is lowered. The collisions increase between the reactants.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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How does subdividing (grinding up) the reactants affect the rate of a chemical reaction? O It decreases the rate by giving the reactants the wrong orientation for reacting. O It increases the rate by lowering the energy of activation (E,). O It increases the rate by giving more molecules enough energy to react. O It decreases the rate by raising the energy of activation (E). O It increases the rate by increasing the surface area or effective concentration of the reactants.
For the chemical reaction system described by the diagram below, which statement is true? Energy Reaction Progress The activation energy for the reverse reaction is greater than the activation energy for the forward reaction. O The forward reaction is endothermic. O The activation energy for the forward reaction is greater than the activation energy for the reverse reaction. O At equilibrium, the activation energy for the forward reaction is equal to the activation energy for the reverse reaction. O The reverse reaction is exothermic.
The half-life of a chemical reaction is the time it takes for half the present reactants to be used up when a reaction has reached the half-way point when only half of the reactant is used the time passed when a reaction is half over
Generally, increasing the temperature increases the rate of a reaction. This is because: O increasing the temperature increases the frequency of collisions O increasing the temperature increases the average energy of the collisions and increases the frequency of collisions O increasing the temperature lowers the activation energy of the reaction increasing the temperature increases the average energy of the collisions.
Which of these are factors that impact rate of reaction? temperature reactant concentration presence of a catalyst O reactant particle size
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2 Define "activation energy" a b What is the role of a catalyst in chemical reactions? Draw an energy profile diagram of an exothermic reaction and show the reaction pathway both with and without a catalyst present.
3) Which of the following is NOT true about a catalyst? A.It may be homogeneous B. It speeds up the reverse reaction C. It is consumed D. It speeds up the forward reaction E. it may be heterogeneous
Which is true? A slow reaction has low activation energy. A fast reaction has large activation energy. The size of the activation energy tells us about the reaction rate. The size of the activation energy tells us about the reaction mechanism.
40. The reaction that produces ammonia is represented by a balanced equation, shown below. A catalyst can be used to increase the rate of the reaction. N2(g) + 3H2(g) → 2NH3(g) + energy A potential energy diagram for the reaction is shown below. C A Reaction Coordinate What occurs when a catalyst is added to a chemical reaction? A. an alternate reaction pathway lowers activation energy, changing the magnitude of both B and C B. new reactants are added which increases their potential energy, changing the magnitude of both A and D C. different products are produced with a lower potential energy, changing the magnitude of both A and B D. the temperature is increased so there are more effective collisions, which changes the magnitude of A and C
Raising the temperature of a reaction causes which of the following? O The rate of reaction will increase. O The rate of reaction will not change. O The rate of reaction will decrease. O None of these.