Which of the following is a chemical change? a water vapor in the air turns to liquid water in the form of rain b the oxygen in the air forms ozone in presence of uv rays c dust and soot particles being suspended in the air d sulphur dioxide being released in the air

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel

What relationship exists between an enzyme and a catalyst?

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?