Rubidium and fodine have different chemical and physical properties. some of these
properties are shown in the table below.
some physical and chemical properties of rubidium and lodine
rubidium
lodine
silvery-white solid
forms ionic compounds with nonmetals
reacts with oxygen in the air
specific heat = 0.363 j/gºk
bluish-black lustrous solid
forms ionic bonds with active metals
sublimes at room temperature
specific heat = 0.214 j/gok

27) state the temperature at which iodine turns from a solid to a gas (3 points)

Based on the equation and the information in the table, what is the enthalpy of the reaction?

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 physical changes with chemical changes.