Benchmark 4E
The Physical Setting: Energy Transformations
Grades 6-8, page 85

Energy appears in different forms. Heat energy is in the disorderly motion of molecules; chemical energy is in the arrangement of atoms; mechanical energy is in moving bodies or in elastically distorted shapes; gravitational energy is in the separation of mutually attracting masses.
 

NSES Content Standard B  Physical Science: Transfer of energy  Grades 5-8, page 155  Energy is a property of many substances and is associated with heat, light, electricity, mechanical motion, sound, nuclei, and the nature of a chemical. Energy is transferred in many ways.  NSES Content Standard B  Physical Science: Conservation of energy and the increase in disorder  Grades 9-12, page 180  Heat consists of random motion and the vibrations of atoms, molecules, and ions. The higher the temperature, the greater the atomic or molecular motion.