Chemistry Crossword

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Across
  1. 2. Substances that help a reaction speed faster. They re not consumed during a chemical reaction.
  2. 7. Use atomic number
  3. 9. the average mass of an element in atomic mass units (AMU)
  4. 12. A new substance produced in a chemical reaction between reactants
  5. 14. When 2 or more substances react to form a new substance. It is irreversible.
  6. 15. An element is defined by number of protons it has.
  7. 16. An experiment where all reactants and all products of a chemical reaction are accounted for.
  8. 17. When a material changes state but does not change composition(makeup). It is reversible.
  9. 18. A reaction that takes place when two or more substances react to form new substances
  10. 20. Group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  11. 21. combo of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  12. 23. Use atomic number
  13. 24. An experiement in which one or more products of a chemical reaction can escape.
Down
  1. 1. Group 17 elements in the periodic table;the most reactive non-metals
  2. 3. Most reactive family in the period table of elements
  3. 4. Substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties.
  4. 5. A slow chemical change that occurs when oxygen in the air reacts with metal. _________ is a chemical reaction in which the metal is decomposed.
  5. 6. Pure substance formed when at least one metal and one non-metal combine
  6. 8. Mass number minus atomic number
  7. 10. A chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy.
  8. 11. An atom that has become electrically charged because it has lost or gained electrons; a positive ion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one or more electrons
  9. 13. A chemical reaction that takes place in the cells of your body. Food (glucose) reacts with oxygen to produce energy,water, and carbon dioxide.
  10. 19. When non-metals combine, they produce a pure substance called a molecule, or molecular compound.
  11. 22. Group 18 elements in the periodic table;the most stable and nonreactive elements