Chemistry 1

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Across
  1. 2. protein or RNA that catalyzes chemical reactions energy that matter possesses because of its motion
  2. 4. atom with a negative charge
  3. 5. heavy subatomic particle having a positive charge and found in the atom’s nucleus
  4. 12. amount of energy greater than the energy contained in the reactants, which must be overcome for a reaction to proceed
  5. 13. Smallest unit of an element that retains the unique properties of that element
  6. 14. atom with an overall positive or negative charge
  7. 15. area of space a given distance from an atom’s nucleus in which electrons are grouped
  8. 16. outermost electron shell of
  9. 19. arrangement of the elements in a table according to their atomic number; elements having similar properties because of their electron arrangements compose columns in the table, while elements having the same number of valence shells compose rows in the table
  10. 23. one or more substances produced by a chemical reaction
  11. 24. number of particles within a given space
  12. 25. atom with a positive charge
  13. 28. substance composed of two or more different elements joined by chemical bonds
Down
  1. 1. energy that matter possesses because of its motion
  2. 3. stored energy matter possesses because of the positioning or structure of its components
  3. 6. one or more substances that enter into the reaction
  4. 7. heavy subatomic particle having no electrical charge and found in the atom’s nucleus
  5. 8. physical substance; that which occupies space and has mass
  6. 9. sum of the number of protons and neutrons in the nucleus of an atom
  7. 10. substance that increases the rate of a chemical reaction without itself being changed in the process
  8. 11. chemical bond in which two atoms share electrons, thereby completing their valence shells
  9. 15. substance that cannot be created or broken down by ordinary chemical means
  10. 17. two or more atoms covalently bonded together
  11. 18. atom
  12. 20. attraction between an anion and a cation
  13. 21. subatomic particle having a negative charge and nearly no mass; found orbiting the atom’s nucleus
  14. 22. number of protons in the nucleus of an atom
  15. 26. one of the variations of an element in which the number of neutrons differ from each other
  16. 27. electrical force linking atoms