How do enzymes speed up chemical reactions? enzymes a) lower the activation energy of chemical reactions. b) raise the temperature of the cell, speeding chemical reactions. c) store atp, allowing more energy to be used in chemical reactions. d) act as miniature 'transfer trucks', gathering materials for chemical reactions, and placing them together.

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?