unit 1 vocab

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Across
  1. 4. A scientific explanation for a set of observations.
  2. 6. bonding weak attraction between a hydrogen atom and another atom
  3. 12. using senses to collect information about your surroundings
  4. 14. pure substance that consists entirely of one type of atom
  5. 16. the basic unit of matter
  6. 18. Organized way of gathering and analyzing evidence about the natural world
  7. 21. in a molecule, uneven distribution of electrons (results in (+) and (-) poles) ex. water
  8. 22. capacity the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C)
  9. 23. variables all other variables that are kept the same in a controlled experiment
  10. 24. a combination of 2 or more elements connected by bonds
  11. 25. mass equal to the total number of protons and neutrons in the nucleus of an atom (based on isotopes)
  12. 26. a well-tested explanation unifies a broad range of observations
  13. 27. particle found in the nucleus that has no charge
  14. 29. variable the variable that changes in response to the independent variable (can have several)
  15. 31. bond type of bond between atoms in which the electrons are shared
Down
  1. 1. method Series of steps that scientists follow to approach research
  2. 2. attraction between molecules of the same substance
  3. 3. positively charged particle found in the nucleus of an atom
  4. 5. variable the one variable that is altered
  5. 7. negatively charged particle that orbits the nucleus in the electron cloud
  6. 8. electron- electron found in the outermost shell of an atom; helps to determine bonding
  7. 9. review an expert analysis of experimental results, completed to allow for other scientists to look for flaws, re-test results, and evaluate validity of the results
  8. 10. experiment-An experiment where only one variable is changed.
  9. 11. number the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table (also equals the number of electrons in an element)
  10. 13. group in a scientific experiment, group where independent variable is altered
  11. 15. the center of an atom, which contains the protons and neutrons
  12. 17. group in a scientific experiment, group where no changes are made (used as a comparison group)
  13. 19. logical interpretation based on what scientists already know
  14. 20. action tendency of water to rise in a thin tube
  15. 28. force of attraction between different kinds of molecules
  16. 30. symbol one or two-letter abbreviation for a chemical element name