A 25-mL sample containing Hg2 was treated with 10.0 mL of 0.0754 M EDTA to complex all the Hg2 and leave excess EDTA in solution. The excess EDTA was then back titrated, requiring 2.17 mL of 0.0264 M Ca2 . What was the concentration of Hg2 in the original solution

When curium-242 is bombarded with an alpha particle, two products are formed, one of which is a nudge on. what is the other product

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

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.