Chemistry crossword puzzle

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Across
  1. 2. Two or more atoms joined together by a chemical bond
  2. 3. Studies all matter that is not alive and has never been alive
  3. 8. The most important side bond to cosmetology; sulfur containing
  4. 11. A change in a substance that creates a new substance with chemical characteristics different from those of the original substance
  5. 14. Based on the theory that atomic groups prefer an environment with other groups that have similar structures.
  6. 16. Hair is a form of this protein
  7. 17. Different atoms joined together
  8. 19. Matter with definite weight, volume and shape
  9. 20. Have a positive electrical charge and identify the atom
  10. 21. Anything that occupies space and has weight
  11. 22. Basic substances that cannot be broken down; same atoms throughout into simpler substances.
  12. 24. The negative charge in one amino acid grouping attracts the positive charge in another
Down
  1. 1. The linking together of amino acids end to end
  2. 4. Compounds consisting of carbon, oxygen, hydrogen, and nitrogen
  3. 5. A change in the physical characteristics of substance without creating a new substance
  4. 6. Matter with definite weight and volume but no definite shape
  5. 7. Have negative electrical charge
  6. 9. Have no electrical charge
  7. 10. The scientific stud of matter and the physical and chemical changes of matter.
  8. 12. Bond Takes place when they hydrogen atom in one molecule is attracted to an atom of another molecule
  9. 13. Matter with definite weight but indefinite volume and shape
  10. 15. Connects thousands of amino acids lengthwise to form a chain.
  11. 18. Deals with all matter that is now living or was alive at one time
  12. 23. The smallest complete unit of an element