ACTIVITY 1 APPEAR OR DISAPPEAR change in timechange in concentration of products%3Dchange in timeThe negative sign indicates a decrease in concentration with time. However, rate is alwaysexpressed as a positive quantity. The concentration of all substances is expressedin molar units.Therefore, units of reaction rates are generally given as mol/(L sec).Activity 1: Appear or DisappearDirections: Consider the graph on concentration versus time. Answer the questionsbriefly.RATE OF REACTIONPRODUCTSREAGENTSSulfur is a non-metallic element which burns but does not ignite until heated toabout 232°C. The combustion reaction is:+ (8) 20 +SO2 (8)(s) S2. What happens to the concentration of sulfur and oxygen in a certain period of time?3. What happens to the amount of sulfur dioxide over a given time?4. What is the correct expression for the appearance of sulfur dioxide gas?Encircle theletter only.A. Rate of appearance of sulphur dioxide = change in concentration of sulfur and oxygenchange in timec hange in concentration of sulfur dioxideB. Rate of appearance of sulphur dioxide=change in timeSometimes a particular reactant will have a greater effect on the reaction rate. To show the relationship between reactantconcentrations and the rate of reaction, the rate law is used. This mathematical equation takes the general expression of:Rate = k [A]m [B] nwhere k is the rate constant that is determined experimentally and changes with temperatureA and B are the reactants; andthe powers of m and n are the reaction order.For example, the following reaction: 2 NO(g) +2 H2(g) > N2(g)+2 H20(g)By experimental results, it follows the rate law of: Rate k [NO]2 [H2]. Stoichiometric coefficients have nothing to dowith rate law.Note that doubling the concentration of hydrogen, H2 will only double the rate since its concentration is only taken to the1st power. However, doubling the concentration of nitric oxide, NO, will cause a fourfold increase in the rate since itsconcentration in the rate law is squared.CONCENTRATION ****

When a particular reaction goes on , then reactants are transformed into products with time…

about 232°C. The combustion reaction is: S (s) (s) (g) 2. What happens to the concentration of sulfur and oxygen in a certain period of time? 3. What happens to the amount of sulfur dioxide over a given time? 4. What is the correct expression for the appearance of sulfur dioxide gas? Encircle theletter only. change in concentration of sulfur and oxygen A. Rate of appearance of sulphur dioxide = %3D change in time B. Rate of appearance of sulphur dioxide c hange in concentration of sulfur dioxide change in time

about 232°C. The combustion reaction is: S (s) (s) (g) 2. What happens to the concentration of sulfur and oxygen in a certain period of time? 3. What happens to the amount of sulfur dioxide over a given time? 4. What is the correct expression for the appearance of sulfur dioxide gas? Encircle theletter only. change in concentration of sulfur and oxygen A. Rate of appearance of sulphur dioxide = %3D change in time B. Rate of appearance of sulphur dioxide c hange in concentration of sulfur dioxide change in time

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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