At 40°C, H2 O2 (ag) will decompose according to the following reaction: 2H2 O2 (ag) 2H2 0(1) + O2 (9) The following data were collected for the concentration of H,O, at various times. Time (s) [H2O2] (mol/L) 1.200 2.28 x 104 0.577 4.56 x 104 0.278 a. Calculate the average rate of decomposition of H2O2 between 0 and 2.28 x 104 s. Average rate = mol/L s Use this rate to calculate the average rate of production of O2 (g) over the same time period. Average rate = mol/L s b. What are these rates for the time period 2.28 x 104 s to 4.56 x 104 s? Rate of H2 O2 decomposition = mol/L s Rate of O2 production = mol/L s

A chemistry graduate student is studying the rate of this reaction: NH,ОH (аq) — NH; (аq)+ н,о (аq) She fills a reaction vessel with NH,OH and measures its concentration as the reaction proceeds: time [NH,OH] (seconds) 0.0600M 0.10 0.0385 M 0.20 0.0247M 0.30 0.0158M 0.40 0.0101 M Use this data to answer the following questions. Write the rate law for this reaction. rate = k || x10 Calculate the value of the rate constant k. k = Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol.

A reaction was experimentally determined to follow the rate law, rate = k[X]2 where k = 0.860/M.s. If the starting concentration of X = 0.800 M, how many seconds will it take for the concentration of X to become 0.400 M? O (3) 0.465 sec O (4) 1.45 sec O (1) 0.805 sec O (2) 1.16 sec A Moving to the next question prevents changes to this answer. # T3 7 To D *3 E C 54 R F % 5 V T G 6 MacBook Pro B Y & N 7 H U N * 00 8 J 1 ( 9 K M O L P Question 12 of 37 > = است 11

The following data were collected for the reaction: 2A > 4B + C Time Concentration of A Concentration of B (minutes) (moles/L) (moles/L) 1.000 0.000 10 0.800 0.400 20 0.667 0.677 30 0.571 0.858 40 0.500 1.000 50 0.444 1.112 1. Make a graph of the concentrations of A and B versus time. Estimate the rate of disappearance of A and the rate of formation of B at t= 25 min and at t= 40 min. Compare the rates of disappearance of A and formation of B. What would you expect the rate of formation of C to be at t= 25 min and t=40 min? 2. Determine graphically whether the reaction in #1 above is a first order or a second order reaction. Calculate the rate constant for the reaction.

Consider the following general reaction for which gases A and B are mixed in a constant volume container: A(g) + B(g) -> C(g) + D(g) Match what happens to the rate of the reaction under the following changes: (consider each change separately) v all of gas B is removed from the container more gas A is added to the container the temperature of the container is increased there is no change to the reaction rate ya catalyst is added to the container I. the reaction proceeds at a faster rate v gas D is also added to the container the reaction proceeds at a slower rate II. some of gas B is removed from the container Iy the reaction does not proceed at all the volume of the container is increased

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Consider the reaction: H2 (g) +I2 (g) → 2 HI (g) A chemist performed an experiment and monitored the concentration of I2 during the course of the reaction. The red line in the graph below represents the results obtained. Which line in the plot would best represent how the concentration of HI changes during the course of the reaction? Time (s) Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a a b b d d е е Concentration (M)

5. You studied the chemical reaction, 2NO2(g) → 2NO(g) + O2(g), at 25°C by monitoring the concentration of NO2(g) as a function of time and constructed the following graph. y= 0.5408x + 125.0 R2=0.998 Time (s) What is the rate constant for this reaction at 25°C? Include the proper units. (W/T) [(3)ONI/T

A chemistry graduate student is studying the rate of this reaction: 2C1₂05 (g) → 2Cl₂ (g) +50₂ (g) She fills a reaction vessel with C1₂05 and measures its concentration as the reaction proceeds: time [C1,05] (seconds) 0 0.400M 10. 0.263 M 20. 0.173 M 30. 0.114M 40. 0.0751M Use this data to answer the following questions. Write the rate law for this reaction. x10 Calculate the value of the rate constant k. X Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. rate = k k = 0 Ś ?

The following data were obtained at constant temperature for the reaction: 4A(g) + 4B (g) → 3C(g) Initial [A] Initial [B] mol Experiment mol mol Initial Rate L-min L L 1 0.105 0.215 4.50 2 0.315 0.215 13.5 3 0.105 0.430 18.0 4 0.315 0.430 54.0 Part 1 of 2 Select the single best expression for the rate law for the reaction. Ok [A]³ [B]³ G Ok [A] [B] Ok [A] [B] Ok [A][B]²