At elevated temperature NO2 reacts with CO producing CO2 & NO: CO(g) + NO2 (g) → CO2 (g) + NO(g). There are two proposed mechanisms for this reaction. In one possible mechanism, products form directly from a bimolecular collision that directly transfers an oxygen atom from NO2 to CO. In another possible mechanism, two nitrogen dioxide molecules collide in a rate-determining step to form NO and NO3. A second, much faster step has the nitrogen trioxide molecule collide with a carbon monoxide to form nitrogen dioxide and carbon dioxide. What is the rate law for each mechanism?
Design a simple experiment to distinguish easily between these two proposed mechanisms.

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Amixture with the same composition throughout is!