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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An effective collision is Choose all that apply Question 40 options: A collision where the particles collide with beneficial collision geometry A collision where the particles have sufficient energy to react A collision that results in a high-energy molecule being permanently created. A collision where old bonds are broken and new bonds are formed
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.
The rate of a reaction is how quickly the reaction goes to completion. If two reactions have the same amount of reactant, increasing the rate does not increase the amount of product produced, it simply reduces the time that it takes to make the product. Using the internet , research the four factors below that affect the rate of a chemical reaction. 1. Reactant concentration ( explained with details and add graphs to explain what you wrote for each one of them) 2. pressure ( explained with details and add graphs to explain what you wrote for each one of them) 3. Temperature ( explained with details and add graphs to explain what you wrote for each one of them) 4. Presence of a catalyst. ( explained with details and add graphs to explain what you wrote for each one of them) Your work should be written in complete sentences, and assume your audience is grade 11 chemistry students who do not understand this unit. Make sure all research is put into your own words!
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.
14. Why does the rate of the reaction decrease over time? A. Exothermic reactions lose heat which cools the reaction which decreases the reaction rate. B. As the reaction proceeds, the concentration of the products results in fewer collisions. C. As the reaction proceeds, a decrease in the concentration of reactants results in fewer successful collisions. D. Not all molecules will react and some choose to stay in their present form. E. none of the above
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.
Why does the rate of most reactions decrease over time? A. A decrease in reactant concentration reduces the frequency of successful collisions. B. A decrease in temperature reduces the average kinetic energy of the particles. C. An increase in product concentration interferes with the effectiveness of the catalyst. D. An increase in pressure of the system reduces the movement and energy of particles.
Iron fillings (very small pieces of iron) rust faster than iron nails. This demonstrates that the rate of reaction depends on the a. temperature of the reactants b. chemical nature of the reacting substances c. state of subdivision of the reactants d. concentrations of the reactants e. presence of a catalyst
You experimentally determine the rate of reaction at different temperatures while keeping the initial concentrations of the reactants constant. What relationship would you expect to find between temperature and rate? A. As temperature increases, rate decreases. B. As temperature increases, rate increases. C. Temperature has no effect on the rate of a chemical reaction. D. The relationship depends how many reactants are present.
Select all of the correct statements about reaction rates from the choices below. 1. The lower the rate of a reaction the longer it takes to reach completion.2. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step.3. Reaction rates decrease with increasing temperature.4. As a reaction progresses its rate goes down.5. Solid catalysts increase reaction rates as their surface areas increase.6. The rate of a reaction is independent of temperature.7. Reaction rates can show little change as masses of solid reactants increase.