Problem 12E

Refer to Exercise 11. Ten more welds will be made in order to increase the precision of the confidence interval. Which would increase the precision the most, cooling all 10 welds at the rate of 10°C/s, cooling all 10 welds at the rate of 30°C/s, or cooling 5 welds at 10°C/s and 5 at 30cC/s? Explain.

Chemistry 1 12: General Chemistry II Week 2, January 30th, 2017 ‐ February 3rd, 2017 Exam #1 = February 1 5th ( Middle of W eek 4) Half‐Life ( Review) : ‐ Half‐life r eacĕons are a lways 1 st order ‐ Integrated R ate L aw = R ½ [ R0 ] ‐ [ t R 0 = ½ ‐ Ln ] t ‐ t 0 ‐ t = .693 ÷ 1/2 How Temperature Aﬀects Rate: ‐ Assuming that Concentraĕon [ R ] is now constant ‐ Temperature = a measure of ineĕc energy