You run a chromatography experiment on a sample of ink and find there are four separate colors to the ink. you measure the distances as follows:
green= 1.50 cm, yellow= 2.25 cm, red = 3.50 cm, blue = 4.25 cm. The
solvent traveled a distance of 5.00 cm. What is the Rf value for green?

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

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.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.