Chemistry Crossword

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Across
  1. 1. an ion with a positive charge
  2. 4. a physical blend of two or more substances that are not chemically combined
  3. 5. the weighted average of the masses of the isotopes of an element
  4. 10. an ion with a negative charge
  5. 12. subatomic particle with a negative charge
  6. 13. the splitting of a nucleus into smaller fragments, accompanied by the release of netrons and a large amound of energy
  7. 14. subatomic particle with a positive charge
  8. 15. point at which a solid turns into a liquid
  9. 18. a substance that increases the ragte of reaction by lowering the activation energy
  10. 20. the study of the structure, properties, and composition of substances, and the changes that substances undergo
  11. 22. a compound that produces hydrogen ions in a solution, is a hydrogen-ion donor, or an electron-pair acceptor
  12. 24. the closeness of a set of measurements taken under the same conditions
  13. 26. a compound that produces hydroxide ions in solution, is a hydrogen-ion acceptor, or an electron-pair donor
  14. 28. a substance that cannot be changed into simpler substances under normal laboratory conditions
  15. 29. a starting substance in a chemical reaction
Down
  1. 2. the closeness of a measurement to the true value of what is being measured
  2. 3. subatomic particle with no charge
  3. 6. a neutral chemically bonded group of atoms that act as a unit
  4. 7. the amount of a substance that dissolves in a given quantity of a solvent at specified conditions of temp. and pressure
  5. 8. point at which a liquid turns into a gas
  6. 9. a reaction in which two light nuclei combine to produce a nucleus of heavier mass, accompanied by the release of a large amount of energy
  7. 11. a substance that can be separated into simpler substances only by chemical reactions
  8. 16. a carefully controlled, repeatable procedure for gathering data to test a hypothesis
  9. 17. the central portion of an atom composed of protons and neutrons
  10. 19. dissolved particles in a solution
  11. 21. the time required for one-half of an atom to decay
  12. 23. atoms of the same elemnt that have the same atomic number but different masses
  13. 25. the dissolving medium in a solution
  14. 27. the concentration of solute in a solution expressed in moles
  15. 30. smallest particle of an element that retains the properties of that element