help fast please Electrolysis (the breaking by electricity) can be used to separate this substance. A mixture B. compound O pure substance D. element..

Compare and contrast physical changes with chemical changes.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table?