Chemistry Crossword

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Across
  1. 4. Substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
  2. 10. Chemical combination of two or more elements in a specific ratio
  3. 12. Pure substance that cannot be broken down into other substances; substance made up of only one type of atom
  4. 13. Orbit of electrons around the nucleus of an atom
  5. 14. A material that electric charge can move through easily
  6. 15. Pure substances formed as a result of the attraction between the particles of opposite charges called ions
  7. 18. new substance produced in a chemical reaction between reactants
  8. 20. Combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  9. 21. change that results when 2 or more substances react to make a new substance
  10. 23. in a chemical reaction is always equal to the total mass of the products
  11. 24. Invisible negatively charged particle that orbits the nucleus of an atom
  12. 25. Mass of one atom of an element calculated from the total number of protons, neutrons and electrons of that atom; measured in atomic mass units (amu)
Down
  1. 1. Substances that help a reaction proceed faster
  2. 2. Group one elements in the periodic table. Not including hydrogen; the most reactive of the metals.
  3. 3. Number of protons in the nucleus of one atom of an element
  4. 5. An experiment in which all the reactants and all products of a chemical reaction are accounted for
  5. 6. A reaction that takes place when two or more substances react to form new substances
  6. 7. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  7. 8. Organic catalysts
  8. 9. Group 2 elements in the periodic table; their reactivity is not a strong as that of the alkali metals
  9. 11. Absorbs heat
  10. 13. Releases heat
  11. 16. An experiment in which one or more products of chemical reaction can escape
  12. 17. Is a chemical reaction that takes place in the cells in your body food (glucose) reacts with oxygen to produce energy, water and carbon dioxide.
  13. 19. Speed of a chemical reaction
  14. 22. Slow chemical change