7. Black/white or gray? Identify the pair of reactions where one reaction is clearly faster than the other. Compare the top line to the bottom line. Explain. NaOH NaNH2 Br + NaBr + Nal or NaOH NaNH2 Br + Nal + NaBr

7-17 If a certain reaction takes 16 h to go to completion at 10°C, what temperature should we run it if we want it to go to completion in 1 h?

Which reaction mechanism assumptions are unimportant in describing simple ionic reactions between cations and anions? Why?

Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?