Determine which of the two diagrams here (both for the same reaction) involves a catalyst, and identify the activation energy for the catalyzed reaction: 100 100 90 80 70 60 90 80 70 60 50 40 30 50 40 30 20 10 20 10 Extent of reaction Extent of reaction (a) (b) Energy (kJ) Energy (kJ)

The equation k = Ae(Ea/RT) indicates the rate of a reaction decreases when the activation. energy increases. O True O False

The following figure represents chemical reaction before and after using a catalyst and from the figure it is obvious that 300 a-catalyst preserve heat energy its value is 100KJ/mol on the usage of the catalyst 100 Reactant b-this reaction is endothermic Product -100- c-activation energy of the forward reaction with out a catalyst is 200KJ/mol d-the catalyst increases energy of reactants which increases rate of the reaction Progress of reaction Energy,(k/mol)

How much time does it take to reduce the concentration of NO2 by half by looking at the reaction process curve below?

Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. (i) H2(g) + NO(g) à H2O(g) + N(g) Ea = 436 kJ ∆H = –491 kJ (ii) N(g) + NO(g) à N2(g) + O(g) Ea = 625 kJ ∆H = –312 kJ (iii) O(g) + H2(g) à H2O(g) Ea = 1690 kJ ∆H = +131 kJ Draw the potential energy diagram for the reaction. Assume the potential energy of the reactants was 1400 kJ

A reversible reaction that occurs in a single step has AH= -26.2 kJ/mol and Ea = 25.2 kJ/mol. What is the activation energy of the reverse reaction? kJ/mol

The following data were acquired in an iodination experiment involving acetone. Reaction times are for the disappearance of iodine.   Trial Volume of 0.0010 M I2M I2(mLmL) Volume of 0.050 M HClM HCl(mLmL) Volume of 1.0 MM acetone(mLmL) Volume of water(mLmL) Temperature(∘C∘C) Reaction time(ss) A 5.0 10.0 10.0 25.0 25.0 130 B 10.0 10.0 10.0 20.0 25.0 249 C 10.0 20.0 10.0 10.0 25.0 128 D 10.0 10.0 20.0 10.0 25.0 131 E 10.0 10.0 10.0 20.0 42.4 38 What is the rate constant at 25.0 ∘C∘C based on the data collected for trial B?

Which of the following is true about finding the molar mass of potassium sulfate, K₂SO4? A. The molar mass is found by adding the molar mass of potassium (K) to the molar mass of sulfate (SO4). B. The molar mass is found by using Avogadro's number divided by 22.4. C. The molar mass is found by taking 2x the molar mass of potassium (K) plus 1x the molar mass of sulfur (S) plus 4x the molar mass of oxygen (O). D. The molar mass of potassium sulfate is a number between 1 and 10.

calculate the activation energy and the frequency factor of a certain reaction, using the tabulated data below

Examine the 2-step mechanism below and identify the substance that appears to be a catalyst and anintermediate, respectively.Step 1. A + BC → AC + BStep 2. AC + D → A + CD(a) A = catalyst, AC = intermediate(b) AC = catalyst, A = intermediate(c) A = catalyst, B = intermediate(d) D = catalyst, AC = intermediate