Chemistry Crossword Puzzle

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Across
  1. 7. The substance that reduces another substance and is oxidized
  2. 8. A___ is a combination of two or more atoms held together by covalent bonds.
  3. 9. A series of cloud-like energy levels called___.
  4. 12. When two or more atoms join together, they form _______s.
  5. 13. A subatomic particle with a negative charge
  6. 15. a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.
  7. 17. A subatomic particle with a positive charge.
  8. 19. method by which hydrophobic (water-repelling) particles of an ore are separated from hydrophilic (water-attracting) particles of a metallurgical pretreatment process.
  9. 21. The substance will remain the same through a __________change.
Down
  1. 1. A combination of pure substances
  2. 2. The ____ states the system mass remains constant.
  3. 3. In a ___, a cloudy mixture is formed in which tiny particles of one substances are held within another substance.
  4. 4. Combination of symbols that indicates the chemical composition of a substance
  5. 5. Compounds that contain only carbon and hydrogen.
  6. 6. One___of oxygen is not stable, two are required for stability.
  7. 10. An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table.
  8. 11. Elements with properties intermediate between the properties of metals and non-metals.
  9. 14. A measure of the intensity of heat, i.e. the hotness or coldness of a sample or object
  10. 15. the material or protoplasm within a living cell, excluding the nucleus.
  11. 16. Noble gases reside in group 18 on the ___of elements.
  12. 18. An atom or a group of atoms that carries an electric charge
  13. 20. a chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red.