54.6 MB (608.8 KB compressed)
4370 x 4370 pixels
37.1 x 37.1 cm ⏐ 14.6 x 14.6 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Calcium reacting with water, later stage. Calcium metal (Ca) reacts vigorously with water (H2O), producing hydrogen gas (H2) bubbles and slightly soluble calcium hydroxide (Ca(OH)2): Ca + H2O -> Ca(OH)2 + H2. Here, a piece of calcium has been dropped into a test tube with water. Calcium first sinks (see C040/2666) but then bubbles up due to the hydrogen gas produced. Calcium hydroxide is later seen as white precipitate, as seen here.
Model release not required. Property release not required.