Our Chemical World

3. water / Lime water is the common name for saturated calcium hydroxide solution. It is sparsely soluble. Its chemical formula is Ca(OH)2.
4. Indicator / A Universal indicator is a pH indicator composed of a blend of several compounds that exhibits several smooth colour changes over a pH.
5. acid / A strongly acidic solution of the gas hydrogen chloride, HCl, in water
8. / 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.
12. / a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an indicator in acid-base titration and as alaxative.
13. / 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
16. / the process of bubbling as gas escapes
17. / A dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
18. / The process of burning something
19. / Relating to a solution or compound that is neither acidic nor alkaline.

1. dioxide / A colorless pungent toxic gas, SO2, formed by burning sulfur in air.
2. / the act, process, or an instance of neutralizing.
6. carbonate / A blue-green compound (chemical formula CuCO3) forming part of the verdigris patina that is found on weathered brass, bronze, and copper.
7. / reaction of carbon dioxide with basses
9. / the act of precipitating; state of being precipitated.
10. less that 7 / lemon juice
11. / the act or process of decomposing
14. chloride / A colorless crystalline compound, NaCl, occurring naturally in seawater and halite; common salt.
15. / 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.