Aworker is exposed to the following airborne concentrations of ethylbenzene: 8: 00 – 10: 00 125 ppm 10: 15 – 12: 15 88 ppm 12: 45 – 3: 15 112 ppm 3: 30 – 5: 00 70 ppm what is the 8-hour twa exposure for the employee (calculate the exposure)? does it exceed the osha pel?

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

V1t2 = v2t1 is an expression of who’s law

Compare and contrast physical changes with chemical changes.