reactions speak louder than words

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Across
  1. 3. table a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
  2. 6. a substance made by mixing other substances together
  3. 8. a thing that represents or stands for something else, especially a material object representing something abstract
  4. 10. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  5. 11. arrangement The distinction between states (that is solids, liquids and gases) is based on
  6. 13. a thing that is composed of two or more separate elements; a mixture
  7. 14. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
  8. 15. the application of scientific knowledge for practical purposes, especially in industry
Down
  1. 1. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
  2. 2. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy
  3. 4. Reaction a process that involves rearrangement of the molecular or ionic structure of a thing that is composed of two or more separate elements; a mixturea substance, as distinct from a change in physical form or a nuclear reaction.
  4. 5. any of the four substances (earth, water, air, and fire) regarded as the fundamental constituents of the world in ancient and medieval philosophy
  5. 7. an element or substance that is not a metal.
  6. 9. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  7. 12. theory A scientific theory is an explanation of some aspect of the natural world that can, in accordance with the scientific method, be repeatedly tested, using a predefined protocol of observations and experiments