Science Fall Final Review

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Across
  1. 2. the rate at which velocity changes
  2. 6. area around the nucleus of an atom where the atom's electrons are most likely to be found
  3. 8. the moon is a quarter of the way around the Earth. You can see the right half of the moon.
  4. 9. a community of organisms and their abiotic environment
  5. 12. basic unit of life
  6. 14. non-living things
  7. 17. a combination of chemical symbols and numbers to represent a substance
  8. 18. the number of complete wavelengths that pass a point in a given time
  9. 20. the actual brightness of a star
  10. 21. a trait that helps an organism survive and reproduce
  11. 22. a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
  12. 24. a galaxy with no regular shape
Down
  1. 1. relation between stars' luminosity (that is, how bright they are) and their temperature (how hot they are).
  2. 3. describes living factors in the environment.
  3. 4. Moon phase when the entire side facing Earth is illuminated.
  4. 5. a galaxy shaped like a flattened ball, containing only old stars.
  5. 7. a push or pull on an object
  6. 10. a subatomic particle that has a negative charge
  7. 11. all of the frequencies or wavelengths of electromagnetic radiation
  8. 13. a substance made up of atoms of two or more different elements joined by chemical bonds
  9. 15. the galaxy containing the solar system
  10. 16. a vertical column of elements in the periodic table
  11. 19. all the different populations that live together in an area
  12. 22. the struggle between organisms to survive in a habitat with limited resources
  13. 23. a collection of stars, dust, and gas bound together by gravity
  14. 25. basic unit of matter