50 Key Terms in Basic Chemistry

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Across
  1. 2. substances that increase the rate of a chemical reaction without themselves becoming chemically changed or part of the product.
  2. 4. simple and outdated model of an atom.
  3. 5. elements that have the same number of protons and electrons but different number of neutrons.
  4. 6. average of the mass numbers of all the isotopes of an element.
  5. 8. energy directly involved in moving matter.
  6. 9. more modern model of an atomic structure.
  7. 10. energy in action.
  8. 12. combination of two or more atoms held together by chemical bonds.
  9. 14. substances in solutions that are in great amounts.
  10. 17. the study of the chemical composition and reactions of living matter.
  11. 19. containing protons and neutrons tightly bound together.
  12. 20. aka emulsions, heterogeneous mixtures, compositions are dissimilar in different areas of the mixture.
  13. 24. a chemical bond between atoms formed by the transfer of one or more electrons from one atom to the other.
  14. 27. stored energy.
  15. 28. bonds in larger molecules are broken giving smaller less complex molecules.
  16. 31. the capacity to do work, or to put matter into motion.
  17. 32. homogeneous mixtures of components that may be gases, liquids and solids.
  18. 35. a net negative charge.
  19. 37. bonds are both made and broken.
  20. 38. smaller particles are bonded together to form larger more complex molecules.
  21. 40. a substance that takes up hydrogen ions in detachable amounts, proton acceptors.
  22. 41. anything that occupies space and has a mass.
  23. 42. an ionic compound containing cations other than H+ and anions other than the hydroxyl ion.
  24. 43. the bond that holds together the combination of atoms with other atoms.
  25. 44. the atom that loses the electron.
  26. 45. atoms with 1 or 2 valence shell electrons.
  27. 46. shell that specifically indicates an atom’s outermost energy level containing the electrons that are chemically reactive.
  28. 47. the mixture has exactly the same composition or makeup throughout.
  29. 48. when acids and bases mix and they produce salt and water.
Down
  1. 1. substances composed of two or more components physically intermixed.
  2. 3. contains positive electrical charges.
  3. 5. compounds that lack carbon.
  4. 6. a substance that releases hydrogen ions in detachable amounts, proton donors.
  5. 7. results from the movement of charged particles.
  6. 11. two or more different kinds of atoms bind.
  7. 13. number of protons in an atom’s nucleus.
  8. 15. forms of energy stored in the bonds of chemical substances.
  9. 16. universal solvent.
  10. 18. identical particles that make up each element.
  11. 21. shared electrons occupy a single orbital common to both atoms.
  12. 22. isotopes of elements and their atoms that decompose spontaneously into more stable forms.
  13. 23. energy that travels in waves.
  14. 25. contains neutral electrical charges.
  15. 26. small atoms with 6 or 7 valence shell electrons.
  16. 29. substances in solutions that are present in smaller amounts.
  17. 30. heterogeneous mixtures with large visible solutes that tend to settle out.
  18. 33. a one or two letter chemical shorthand designated to each element
  19. 34. a net positive charge.
  20. 36. contains negative electrical charges.
  21. 39. the sum of the masses of its protons and neutrons.