Hi, this is about chemistry

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Across
  1. 2. a pure substance made up of only one type of atom
  2. 3. a large molecule made up of small repeating subunits chemically bonded together.
  3. 4. a pure substances made up of two or more different atoms chemically bonded together
  4. 7. the abilitly of a substance to catch fire
  5. 8. the breakdown of a metallic substance due to a chemical reaction with substances in the environment, such as oxygen and water
  6. 10. a row across the periodic table
  7. 12. a plastic made from starch derived from plants such as corn and potatoes
  8. 14. the ability of a substance to benf or be hammered into the without changing the composition of a substance
  9. 16. a substance used up in chemical reaction
  10. 17. a particle in which two or more atoms different on-metal elements are chemically bonded together
  11. 19. a letter of the alphabet used to represent an atom of a specific element.
  12. 23. whenethe chemical make-up of a material changes, and a new substance or substances are formed
  13. 26. how shiny a material is
  14. 27. a substance made up of the same material
  15. 28. a substance madeup of different types of particle, physically combined
Down
  1. 1. both a philosophy and an ancient practice of of science
  2. 2. the ability of a substance to transfer heat: good heat conductors transfer heat well; poor heat conductors (inslulators) transfer heat poorly
  3. 3. occurs when the form of a substance changes; but the kind of substance remains the same; for example ; a change of state and dissolving
  4. 5. a column dowm the periodic table
  5. 6. a green patina cause by the reaction of copper with air or sea water over a long period of time.
  6. 9. the ability of a sustance to be drawn into wires
  7. 11. the properties that show how a substance reacts when combined with other substances
  8. 13. a particle in which two or more atoms of the same non-metal element are chemically bonded together.
  9. 15. a molecule consisting of two ('di-' meaning 'two'; 'atomic' meaning from 'atom')
  10. 16. a compund produced when iron reacts with oxygen and water in the atmosphere
  11. 18. does not break down
  12. 20. capable of decomposing by the action of microrganisms
  13. 21. a collection of symbols and numbers that represents a number of atoms in a particle.
  14. 22. how poisonous a substance is
  15. 24. a characteristic or texture of a substance
  16. 25. a new substance produced in a chemical reaction