Ch. 4: The Nature of Matter Crossword Puzzle

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Across
  1. 7. a substance that does not contain carbon or only has single carbon atoms
  2. 10. a physical change in the visible structure of the matter without changing the molecular or unit structure
  3. 11. is a molecule that contains two or more different elements which have chemically combined
  4. 14. an ion with a positive electrical charge
  5. 17. a mixture with uniform distribution of particles throughout the sample
  6. 18. the number of protons in the nucleus of each atom of the element
  7. 19. a neutral particle in the nucleus of an atom
  8. 22. the force that holds two or more atoms together
  9. 23. the outermost electron of an atom that participates in chemical bonding
  10. 25. the central core of the atom containing protons and neutrons
  11. 26. a starting substance in a chemical reaction
  12. 27. a mixture with nonuniform distribution of particles throughout the sample
  13. 28. the rows in the periodic table which are often numbered top to bottom from 1 to 7
  14. 29. a combination of symbols of the elements that make up a compound and represent one molecule or unit of a compound
Down
  1. 1. a substance produced by a chemical reaction
  2. 2. the scientific principle stating that matter can be changed but not created or destroyed
  3. 3. the chemical bond formed when atoms share one or more pairs of valence electrons
  4. 4. the columns in the periodic table which are often numbered left to right from 1 to 18
  5. 5. an atom or group of atoms that has a positive or negative electrical charge because it has gained or lost electrons
  6. 6. an ion with a negative electrical charge
  7. 7. the chemical bond in which the electrons are transferred from one atom to another, causing both atoms to have a charge and be attracted to each other
  8. 8. the sum of the number of protons and neutrons in an atom
  9. 9. a positively charged particle in the nucleus of an atom
  10. 10. an alteration in shape, physical state, size, or temperature without a change in the chemical identity
  11. 12. a change occurring when atoms of one or more substances rearrange to form one or more new substances with different chemical and physical properties
  12. 13. a negatively charged particle that occupies the space in an atom outside the nucleus
  13. 15. the smallest unit of any elemental substance that maintains the characteristics of that substance
  14. 16. a substance containing chains or rings of carbon
  15. 20. two or more atoms of the same element that combine chemically; the basic unit of any compound
  16. 21. a substance that contains only one kind of atom
  17. 24. when two atoms stare two pairs of electrons
  18. 30. substances that are put together but are not chemically combined