Our Chemical World

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Across
  1. 3. sulphate/ a colorless water-soluble powder; used as a mordant or to preserve wood or for the electrodeposition of zinc.
  2. 5. the process of bubbling as gas escapes
  3. 6. the act of precipitating; state of being precipitated.
  4. 9. acid/ A strongly acidic solution of the gas hydrogen chloride, HCl, in water
  5. 11. A dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
  6. 14. the act, process, or an instance of neutralizing.
  7. 16. Relating to a solution or compound that is neither acidic nor alkaline.
  8. 17. The process of burning something
  9. 19. dioxide/ A colorless pungent toxic gas, SO2, formed by burning sulfur in air.
Down
  1. 1. Indicator/ A Universal indicator is a pH indicator composed of a blend of several compounds that exhibits several smooth colour changes over a pH.
  2. 2. Zinc is a metallic element with a blue-white color used as a protective coating for iron and to make metal alloys like nickel silver.
  3. 4. a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an indicator in acid-base titration and as alaxative.
  4. 7. carbonate/ A blue-green compound (chemical formula CuCO3) forming part of the verdigris patina that is found on weathered brass, bronze, and copper.
  5. 8. the act or process of decomposing
  6. 10. water/ Lime water is the common name for saturated calcium hydroxide solution. It is sparsely soluble. Its chemical formula is Ca(OH)2.
  7. 12. chloride/ A colorless crystalline compound, NaCl, occurring naturally in seawater and halite; common salt.
  8. 13. reaction of carbon dioxide with basses
  9. 15. Any of a class of compounds that form hydrogen ions when dissolved in water, and whose aqueous solutions react with bases and certain metals to form salts. Acids turn blue litmus paper red and have a pH of less than 7. Their aqueous solutions have a sour taste.
  10. 18. Any of a class of compounds that form hydroxyl ions (OH) when dissolved in water, and whose aqueous solutions react with acids to form salts. Bases turn red litmus paper blue and have a pH greater than 7. Their aqueous solutions have a bitter taste
  11. 20. less that 7/ lemon juice