50.0 MB (6.7 MB compressed)
5126 x 3412 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Chalk reacting with acid. When few drops of 1M hydrochloric acid are poured on the chalk stick, bubbles are produced. Chalk contains calcium carbonate that reacts with hydrochloric acid to produce carbon dioxide bubbles: CaCO3 + HCl -> CaCl2 + H2O + CO2.
Model release not required. Property release not required.