My Chemistry Crossword :)

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Across
  1. 2. atoms of the same element that have different masses
  2. 3. the study of most carbon containing compounds
  3. 5. describes mathematically the wave properties of electrons and other very small particles
  4. 7. refers to the bending of a wave as it passes by the edge of an object through a small opening
  5. 13. is a measure of the gravitational pull on matter
  6. 17. is generally carried out to solve a problem
  7. 22. the best chemistry teacher
  8. 23. the measure of the quantity of matter
  9. 24. in a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated.
  10. 26. the study of properties and changers of matter and their relation to energy
  11. 27. smallest particle of an element that still holds the chemical properties of the element
  12. 31. the number of waves that pass a given point in a specific time, usually one second
  13. 32. a particle of electromagnetic radiation having zero mass and carrying a quantum of energy
  14. 34. refers to the closeness of a set of measurements of the same quantity made in the same way
  15. 35. the superscript indicates the mass number and the subscript indicates the atomic number
  16. 37. a ratio derived from the equality between two different units that can be use to convert from one unit to the other
  17. 38. use of mathematics and computers to understand observed chemical behavior and predict the properties of new compounds
  18. 39. the study of non organic substances many of which have organic fragments bounded to metals
Down
  1. 1. an element that is a good electrical conductor
  2. 4. the study of composition, structure, and properties of matter.
  3. 6. an element that is a poor electrical conductor
  4. 8. any substance that has a definite composition
  5. 9. is a specific portion of matter in a given region of space that has been selected for a study during an experiment or observation
  6. 10. occurs when waves overlap
  7. 11. is carried out for the sake of increasing knowledge
  8. 12. the ratio of mass to volume
  9. 14. the identification of the components and composition of materials
  10. 15. an element that has some characteristics of both metal and non metal
  11. 16. the distance between corresponding points on adjacent waves
  12. 18. is calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, then multiplying by 100
  13. 19. the total number of protons and neutrons that make up the nucleus of an isotope
  14. 20. an approach to solving problems by collecting data, forming and testing hypotheses and formulating theories supported by data
  15. 21. using senses to obtain data
  16. 25. the mass number is written with a hyphen after the name of the element
  17. 28. is the number of protons of each atom of that element
  18. 29. a small region located at the center of an atom
  19. 30. the amount of space occupied by an object
  20. 33. the study of substances and processes occurring in living things
  21. 36. refers to the closeness of measurements to the correct or accepted value of the quantity measured.