Showing 1–12 of 68 results
Common violet or viola odorata,botanical vintage engraving
Garden violet or viola odorata is a perennial flowering plant, the flowers have a sweet scent popular in Victorian era and leaves are still used in perfumery
Chemistry: lab equipment for nitrogen production
Nitrogen gas is an industrial gas produced by the fractional distillation of liquid air. Nitrogen is formally considered to have been discovered by Scottish physician Daniel Rutherford in 1772, Lavoisier referred to it as “mephitic air” or azote.
Chemistry: early spectroscope using prisms with graduations marking wavelengths of light
Optical spectrometer or spectroscope is an instrument used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Joseph von Fraunhofer developed the first modern spectroscope, Gustav Robert Kirchhoff and Robert Bunsen discovered the application of spectroscopes to … Continued
Chemistry: lab production of silicon tetrachloride SiCl4
Lab equipment for production of silicon tetrachloride : SiO2+Cl4+C2=SiCl4+2 CO. The silicon tetrachloride is condensed to colorless liquid form.
Chemistry: chemical composition of carbon dioxide, weight analysis: H2CO3 + CaO=CaCO2+H2O
Carbon dioxide was the first gas to be described as a discrete substance. In the seventeenth century the Flemish chemist Jan Baptist van Helmont observed that when he burned charcoal in a closed vessel, the mass of the resulting ash … Continued