Awell-insulated tank contains concentrated hcl solution in water. if more water is added to this tank the temperature of the system will
select one:
a. increase
b. decrease
c. no change
d. cannot tell

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

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.

One similarity and one difference between an element and a mixture of elements