3. The higher the temperature is, the faster is the rate of reaction because ... more molecules collides with other molecules. less molecule collides with other molecules. molecules become smaller in size. molecules become larger. Other: 4. Why does the rate of chemical reaction increases as you increase the temperature more molecules collides with other molecules. less molecule collides with other molecules. molecules become smaller in size. molecules become larger. 5. What happens to the reaction rate if the concentration of reactants decreases? Reaction rate decreases. Reaction rate increases Reaction rate will decrease and then increase after a while. Reaction rate will increase and then decrease after a while. Other:

3. The higher the temperature is, the faster is the rate of reaction because ... more molecules collides with other molecules. less molecule collides with other molecules. molecules become smaller in size. molecules become larger. Other: 4. Why does the rate of chemical reaction increases as you increase the temperature more molecules collides with other molecules. less molecule collides with other molecules. molecules become smaller in size. molecules become larger. 5. What happens to the reaction rate if the concentration of reactants decreases? Reaction rate decreases. Reaction rate increases Reaction rate will decrease and then increase after a while. Reaction rate will increase and then decrease after a while. Other:

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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The addition of a catalyst(s) is an extra step in the overall reaction. Which of the following provides a benefit towards the additional step? a. promotes the formation of the product faster b. raises the temperature of the reaction c. lowers the activation energy d. the first step will always be slower e. slows the overall reaction to minimize byproducts
Q1. According to the "collision theory" model, why does the rate of a reaction increase when temperature increases? I. There are more collisions per second. II. The molecules are vibrating with a higher frequency. III. A greater proportion of the collisions between reactants have the required activation energy for the reaction to proceed a. I only b. II only c. III only d. I,II and III e. I and III only Q2. A reaction was found to be first order with a rate constant of3.4×10−4 s−1What percentage of the starting material would remain after 2 hours? a.8.65%b.96.0%c.90.3%d.4.00%e.99.9%Q3. The half-life of a rection was calculated at 300 seconds. What \% of starting material would remain after 900 seconds? a.25%
What are the four factors that influence the rate of chemical reactions? Also, explain in detail how these factors influence the rate of chemical reactions?
Which of the following can be used to determine the rate of a chemical reaction? Select one: A. Measuring a change in gas volume B. Measuring a change in mass C. Measuring a change in concentration of a certain species D. All of the above
1. a. Explain in your own words, what is meant by the term "activation energy." b. How can the idea of activation energy be used to explain the temperature dependance of rate? c. How can activation energy be used to explain why a catalyst increases the rate of a chemical reaction
Catalysts play an important role in many reactions. Check all of the true statements. A. Any catalyst will speed up any reaction. B. Catalysts can be in the same phase or a different phase as the reactants. C. A catalyst can change the mechanism of a reaction. D. A catalyst is consumed in a chemical reaction.
As the temperature of a reaction is increased, the rate of the reaction increases because the: a) reactant molecules collide less frequently. b) reactant molecules collide with greater energy. c) reactant molecules collide less frequently and with greater energy. d) activation energy is lowered. e) activation energy is increased because of more collisions.
How does low concentration affect reaction rate? A. It decreases the amount of reactants B. It increases the frequency of particle collisions C. It highers the activation energy D. It increases the energy of particle collisions
3
a. Define what is the reaction rate and b. Explain the importance of understanding reaction rates.
16. A reaction mechanism proposes three step reactions for the overall reaction and the energy diagram shows three activated states. From the proposed mechanism and energy diagram how many reaction intermediates are expected to form?A. 3 B. none C. 1 D. 2 E. 4
Which of the following is directly related to reaction rate? A. Concentration B. Pressure C. Time D. Temperature