Prior to the spill, the mining waste holding pond was intended to temporarily hold water to allow time for particles to settle and the pH to be adjusted. Suppose the pond was used as intended, assuming no flow in or out. Cyanide (a common chemical used to extract gold from ore) is present in the pond at a concentration of 0.5 mg/L. Cyanide has a decay rate of 0.05/hr. What would the cyanide concentration be after 1 day of holding the water in the pond

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

Compare and contrast solutions and suspensions

What energy is it when you flip on a switch on a lamp