Which must be a mixture of substances?
(1) solid (3) gas
(2) liquid (4) solution

What three things does a balanced equation show you?

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2

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?