Which one of the following is a decomposition reaction? a. 2so3 (g) → 2so2 (g) + o2 (g) b. ch4 (g) + 2o2 (g) → co2 (g) + 2h2o (g) c. 2lioh (s) + co2 (g) → li2co3 (s) + h2o (l) d. h2 (g) + cl2 (g) → 2hcl (g)

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Difference between series and parallel circuits