Chemistry crossword

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Across
  1. 1. a state in which an atom has more energy than it does at its ground state
  2. 5. an atom that is identified by the number of protons and neutrons in its nucleus
  3. 7. a base that ionizes completely in a solvent
  4. 10. the change of a substance from a liquid to a gas
  5. 11. a charged electron emitted during a certain type of radioactive decay, such as beta decay
  6. 13. the SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms in 12 g of carbon-12
  7. 14. energy transferred between objects that are at different temperatures
  8. 15. a subatomic particle that has no charge and that is found in the nucleus of an atom
  9. 17. a substance that donates a proton to another substance
  10. 19. a base that forms when an acid loses a proton
  11. 20. the mass of an atom expressed in atomic mass units
  12. 24. a proton or a neutron
  13. 27. the lowest energy state of a quantized system
  14. 30. a change that occurs when one or more substances change into entirely new substances with different properties
  15. 33. describes a substance, such as water, that has the properties of an acid and the properties of a base
  16. 36. all of the frequencies
  17. 37. wavelengths of electromagnetic radiation
  18. 38. a base that releases few hydroxide ions in aqueous solution
  19. 39. the minimum mass of a fissionable isotope that provides the number of neutrons needed to sustain a chain reaction
  20. 40. the point at which the two solutions used in a titration
  21. 51. a region in an atom where there is a high probability of finding electrons
  22. 53. the area of chemistry that is the study of reaction rates and reaction mechanisms
  23. 54. the energy of an object that is due to the object’s motion
  24. 55. the interaction that binds nucleons together in a nucleus
  25. 56. an acid that ionizes completely in a solvent
  26. 59. the combination of the nuclei of small atoms to form a larger nucleus, a process that releases energy
  27. 60. the rate at which a chemical reaction takes place
Down
  1. 1. a subatomic particle that has a negative electric charge
  2. 2. a solution of known concentration that is used to titrate a solution of unknown concentration
  3. 3. the number of protons in the nucleus of an atom
  4. 4. the high-energy photon emitted by a nucleus during fisson and radioactive decay
  5. 6. describes a process in which a system releases heat into the environment
  6. 8. 6.022 × 1023, the number of atoms or molecules in 1 mol
  7. 9. an explanation for some phenomenon that is based on observation, experimentation, and reasoning
  8. 12. the arrangement of electrons in an atom
  9. 16. the splitting of the nucleus of a large atom into two or more fragments, a process that produces additional neutrons and a lot of energy
  10. 18. a summary of many experimental results and observations; a law tells how things work
  11. 21. the quantity of heat required to raise a unit mass of homogeneous material 1 K or 1°C in a specified way given constant pressure and volume
  12. 22. the principle that states that two particles of a certain class cannot be in the exact same energy state
  13. 23. a solution of known concentration
  14. 25. the point in a titration at which a marked color change takes place
  15. 26. describes a process in which heat is absorbed from the environment
  16. 28. a method to determine the concentration of a substance in solution by adding a solution of known volume
  17. 29. the mass in grams of 1 mol of a substance
  18. 31. the reaction of the ions that characterize acids
  19. 32. a subatomic particle that has a positive charge and that is found in the nucleus of an atom
  20. 34. a series of steps followed to solve problems, including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions
  21. 35. the time required for half of a sample of a radioactive substance to disintegrate by radioactive decay or natural processes
  22. 41. a reaction in which a change in a single molecule makes many molecules change until a stable compound forms
  23. 42. the sum of the numbers of protons and neutrons of the nucleus of an atom
  24. 43. a change of matter from one form to another without a change in chemical properties
  25. 44. an acid that forms when a base gains a proton
  26. 45. the pH range through which an indicator changes color
  27. 46. a number that specifies the properties of electrons
  28. 47. a theory or explanation that is based on observations and that can be tested
  29. 48. an acid that releases few hydrogen ions in aqueous solution
  30. 49. a measure of how hot (or cold) something is
  31. 50. the process by which an unstable nucleus emits one or more parti- cles or energy in the form of electromagnetic radiation
  32. 52. an atom that has the same number of protons (atomic number) as other atoms of the same element but has a different number of neutrons (atomic mass)
  33. 57. an atom’s central region, which is made up of protons and neutrons
  34. 58. the capacity to do work