Science Crossword Puzzle

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Across
  1. 1. A compound or substance that has been purified or prepared, especially artificially
  2. 5. The basic unit of a chemical element
  3. 8. The rate at which a vibration occurs that constitutes a wave
  4. 13. The SI unit of frequency, equal to one cycle per second
  5. 14. Distance between the resting position and the maximum displacement of the wave
  6. 15. A measure of the rate of energy transfer over a unit of time
  7. 17. A substance that is capable of dissolving or dispersing one or more other substances to form a solution
  8. 18. Newton's First Law
  9. 21. A substance made from two or more different elements that have been chemically joined
Down
  1. 2. Two or more substances that are mixed together but not chemically combined and that may vary in proportion
  2. 3. A fundamental interaction which causes mutual attraction between all things with mass or energy.
  3. 4. Strength or energy exerted or brought to bear
  4. 6. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
  5. 7. A simple substance that cannot be broken down into smaller parts or changed into another substance
  6. 9. The highest surface part of a wave
  7. 10. A phenomenon in which an object changes its position with respect to time and its surroundings
  8. 11. The transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object
  9. 12. A chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution
  10. 16. Unit used to measure force
  11. 19. A chemical that gives off hydrogen ions in water and forms salts by combining with certain metals.
  12. 20. The SI unit of work or energy