chemistry crossword

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Across
  1. 4. of or relating to chemistry or the interactions of substances as studied in chemistry
  2. 6. gas any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table
  3. 7. new substances produced in a chemical reaction between reactants
  4. 9. rapid chemical combination of a substance with oxygen, involving the production of heat and light
  5. 13. is poisonous an can kill you
  6. 14. change Substances often undergo changes that make them have a dramatically different appearance even though the chemical composition of the substance remains unchanged
  7. 16. a substance that takes part in and undergoes change during a reaction
  8. 18. gas is a substance that is a gas at normal room temperature and pressure, and is contained under pressure, usually in a cylinder
  9. 19. element that has both metallic and non-metallic properties
  10. 20. mass the mass of an atom of a chemical element expressed in atomic mass units
  11. 21. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  12. 22. a mathematical relationship or rule expressed in symbols
Down
  1. 1. a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction
  2. 2. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
  3. 3. is a column of elements in the periodic table of the chemical elements
  4. 5. is tending to cause corrosion
  5. 8. (of a reaction or process) accompanied by or requiring the absorption of heat
  6. 9. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change
  7. 10. compound A compound which is held together by ionic bonds
  8. 11. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel)
  9. 12. (of a compound) formed from its constituent elements with a net release of heat
  10. 14. is the name given to a horizontal row of the periodic table
  11. 15. any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table
  12. 17. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen