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Across
  1. 2. Atoms with the same number of protons but different number of neutrons
  2. 4. the ratio of the mass of an object to its volume
  3. 5. part of the experiment that is not being tested and is used for comparison
  4. 7. chemical reaction where a metal is exposed to a nonmetal
  5. 9. substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)
  6. 12. positively charged subatomic particles found on the nucleus
  7. 13. something you assume you know
  8. 16. subatomic particle that is not charged and located in the nucleus of the atom
  9. 17. series of nuclear fission
  10. 21. mixture than looks the same throughout
  11. 22. occurs in nature, humans use for enjoyment
  12. 25. chemical reaction, when something is exposed to oxygen and changes
  13. 27. a change in the form of a substance but not its chemical composition
  14. 29. where the electrons are found in a nucleus
  15. 30. A substance formed by the combination of elements in fixed proportions.
  16. 31. resistant to flow
  17. 32. the center of an atom where the protons and neutrons are located
  18. 33. small nuclei combine to form a large one, occurs naturally on the sun
  19. 34. nature can regenerate as fast as the resources are used by humans.
  20. 35. A homogeneous mixture
Down
  1. 1. process that an unstable isotopes emit energy in the form of radiation.
  2. 2. atom that has a positive or negative charge
  3. 3. negative charged particles, part of an atom
  4. 6. the smallest particle of an element that retains its identity in a chemical reaction
  5. 8. variable changed by the scientist; what the investigator is testing, found on x- axis
  6. 10. a substance capable of dissolving other substances
  7. 11. the energy in the nucleus of an atom
  8. 14. mixture that you can distinguish the parts, uneven throughout
  9. 15. matter that has the same composition and properties throughout, element or compound
  10. 18. deposits of organic materials, formed from decayed plants and animals that have been converted to useful products
  11. 19. a variable that is not changed
  12. 20. resources that cannot regenerate within the time period that they are consumed.
  13. 23. a chemical reaction that creates heat and light
  14. 24. a series of steps used by scientists/people to help find solutions to problems and/or questions
  15. 26. type of change where a substance changes into a new substance
  16. 28. A nuclear reaction in which a large nuclei breaks into smaller ones. This process occurs in nuclear power plants and atomic bombs.