Chemistry Crossword

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Across
  1. 2. slow chemical change that occurs when oxygen in the air reacts with a metal
  2. 8. number of protons in the nucleus of one atom of an element
  3. 9. ability of a substance to conduct electricity or heat
  4. 10. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
  5. 11. a reaction that takes place when two or more substances react to form new substances
  6. 12. chemical reaction that releases eenergy
  7. 14. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
  8. 18. principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
  9. 22. metals group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  10. 23. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  11. 25. an experiment in which all reactants and all products of a chemical reaction are accounted for
Down
  1. 1. substance that helps a chemical reaction to proceed more quickly
  2. 2. 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
  3. 3. 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)
  4. 4. catalyst involved in chemical reactions in living things
  5. 5. chemical reaction that absorbs energy
  6. 6. vertical column of elements in the periodic table; elements in a family all have similar chemical properties; also called a family
  7. 7. invisible negatively charged particle that orbits the nucleus of an atom
  8. 13. measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon 12 atom
  9. 15. compound that dissolves in water to form a solution with a pH lower than 7
  10. 16. (CO(g))colourless, odourless gas;produced by incomplete combustion of chemicals containing carbon (e.g. hydrocarbons); major source: motor vehicles
  11. 17. chemical combination of two or more elements in a specific ratio
  12. 19. orbit of electrons around the nucleus of an atom
  13. 20. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  14. 21. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
  15. 24. 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