The three main phases of matter (not including plasma) are solids, liquids, and gases. They have different properties concerning the arrangement of particles. Choose all of the statements that are true.
solids have the most tightly-packed particle arrangement
liquids are closely-packed but with no regular arrangement
gases are loosely packed and have no regular arrangement
Solids are made of macroscopic particles while the others are microscopic
There is no regular pattern in solids

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Asher cycles 12 miles in 16 hours. what is his speed?

Energy flows from the producer level to the level. is called