Chemistry Crossword Puzzle

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Across
  1. 3. number The sum of the number of protons and neutrons in an atom's nucleus.
  2. 4. number The number of protons in the nucleus of an atom.
  3. 7. Ratio A conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles
  4. 8. Number Number of representative particles in a mole, 6.02 X 10^23
  5. 9. Yield The amount of product that actually forms when the reaction is carried out in the laboratory
  6. 10. shows the number of atoms of an element in one molecule of a substance
  7. 11. atom with the same number of protons but different number of neutrons
  8. 13. Formula A formula with the lowest whole-number ratio of elements in a compound
  9. 17. Composition The percent by mass of each element in a compound
  10. 18. Reagent Any reactant that is used up first in a chemical reaction; it determines the amount of product that can be formed in the reaction
Down
  1. 1. changes changes that alter the form or appearance of a material but not a new substance
  2. 2. the materials you have at the beginning of a reaction
  3. 5. Mass The mass of one mole of a substance
  4. 6. The portion of chemistry involving the calculation of quantities of substances involved in chemical reactions (and numerical relationships in chemical reactions)
  5. 12. general term for a specific isotope of an element
  6. 14. the materials you have at the end of a reaction
  7. 15. changes a change to matter that produces a new substance with new properties
  8. 16. of conservation of mass matter cannot be created or destroyed in a chemical reaction