Chemistry

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Across
  1. 5. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign
  2. 9. Chemical reaction that releases heat energy
  3. 10. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  4. 11. Number of protons in the nucleus of one atom of an element
  5. 12. Workplace Hazardous Material Information System
  6. 14. Pure substance that cannot be broken down into other substances; substance only made up of one type of atom
  7. 19. Basic unit of a chemical element
  8. 20. Chemical reaction that absorbs heat energy
  9. 23. More than two elements combine
  10. 24. Below
  11. 25. New materials produced by the reaction
Down
  1. 1. Slow chemical change that occurs when oxygen in air reacts with a metal
  2. 2. French chemist who created a nomenclature for naming compounds
  3. 3. Anything that has mass and occupies space
  4. 4. Pure substance formed when non-metals combine
  5. 6. 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
  6. 7. Chemical reaction that takes place in the cells in your body
  7. 8. Mass of one atom of an element calculated from the total number of protons, neutrons, and electrons of that atom; measured in amu
  8. 13. Have metallic and non-metallic properties
  9. 15. Materials at the start of a reaction
  10. 16. A book describing the achievements of alchemists.
  11. 17. A table in which the elements are organized by their physical and chemical properties
  12. 18. Substances that help a reaction proceed faster
  13. 21. The central and most important part of an object, movement, or group, forming the basis for its activity and growth
  14. 22. Pure substance formed when at least one metal and one non-metal combine