A) Calculate the half-life of the antimicrobial agent at 25°C. Be sure to include the units. B) The activation energy for the degradation reaction is 9.2 kJ mol-'. Sup- pose you store your sunscreen in the locker room at the gym, which has an average temperature of 35°C. What is the half-life of the an- timicrobial agent in the conditions at the gym?

|回|回|回一回|日 https://bbhosted.cuny.edu/webapps/assessment/take/launch.jsp?course assessment id3 2032637_1&course Remaining Time: 1 hour, 27 minutes, 03 seconds. * Question Completion Status: QUESTION 5 Which of the following statements about a catalyst is true? O Catalysts increase the rate of the reaction. O Catalysts increase the activation energy of a reaction. O Catalysts decrease the rate of the reaction. O Catalysts cause a system at equilibrium to shift towards the reactants. O Catalysts cause a system at equilibrium to shift towards the products. QUESTION 6 What is the hydronium (H2O*) concentration of a solution with a pH of 5.16? Click Save and Submit to save and submit. Click Save All Answers to save all ansuwers. here to search DELL

Explain your reasoning, please. Thank you.

The activation energy of an uncatalyzed reaction is 86 kJ/mol. The addition of a catalyst lowers the activation energy to 81 kJ/mol Part A Assuming that the collision factor remains the same, by what factor will the catalyst increase the rate of the reaction at 24 °C? Express the ratio to two significant digits. Templates Symbols undo rego feset keyboard shortcuts Help k./k, = 23•106 Submit Prevlous Anawers Requeat Anawer X Incorrect; Try Again; 7 attempts remaining Part B Assuming that the collision factor remains the same, by what factor will the catalyst increase the rate of the reaction at 128 °C? Express the ratio to two significant digits. Templates SymBols undo redo Teset keyboard shortcuts Help k/k = Submit Request Anewer < Return to Assignment Provide Feedback

d-f please only

A reaction increases its rate four times when temperature increases from  250 K to 300 K. What is the activation energy of the reaction? Round off your answer to 3 significant figures and with correct units:

The mechanism of the decomposition of hydrogen peroxide is H202(aq) + I-(aq) -> H2O(l) + IO-(aq) IO-(aq) + H202(ag) -> H20(l) + 02(9) + I- (aq) what is the overall reaction equation? is there a reaction intermediate? if so, what is it? Is there a catalyst? If so, what is it? what is the rate law for the overall reaction?

In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °CNH4NCO(aq)(NH2)2CO(aq)the following data were obtained: [NH4NCO], M 0.780 0.390 0.195 9.75×10-2 minutes 0 131 393 918 Hint: It is not necessary to graph these data.(1)The observed half life for this reaction when the starting concentration is 0.780 M is______ min and when the starting concentration is 0.390 M is ______min.(2)The average (1/[NH4NCO]) / t from t = 0 min to t = 131 min is______ M-1 min-1.The average (1/[NH4NCO]) / t from t = 131 min to t = 393 min is_____ M-1 min-1.(3)Based on these data, the rate constant for this _______ (zerofirstsecond) order reaction is M-1 min-1.   fill in the blanks