Chemistry Crossword

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Across
  1. 2. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
  2. 3. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  3. 6. chemical reaction that releases energy
  4. 10. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  5. 12. principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
  6. 13. the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
  7. 14. change of state from a gas to a solid
  8. 17. amount of mass in a given volume of a substance
  9. 19. reaction that takes place when two or more substances react to form new substances
  10. 22. number of protons in the nucleus of one atom of an element
  11. 23. change of state from a gas to a liquid
Down
  1. 1. chemical reaction that takes place in cells; food (sugar) reacts with oxygen to produce energy, water, and carbon dioxide
  2. 4. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  3. 5. substance that helps a chemical reaction to proceed more quickly
  4. 7. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
  5. 8. chemical combination of two or more elements in a specific ratio
  6. 9. 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)
  7. 11. chemical reaction that absorbs energy
  8. 15. catalyst involved in chemical reactions in living things
  9. 16. change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
  10. 18. description of a solid that can be stretched into a long wire
  11. 19. ability of a substance to conduct electricity or heat
  12. 20. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  13. 21. slow chemical change that occurs when oxygen in the air reacts with a metal