A pre-test or pre-inspection is an unofficial test provided as an option to vehicle owners prior to having an official Smog Check performed on the vehicle. Smog Check stations may charge for this service if authorized by the consumer.
Ammonia or azane is a compound of nitrogen and hydrogen with the formula NH 3. It is a colourless gas with a characteristic pungent smell. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers.iquid ammonia is an ionising solvent, although less so than water, and dissolves a range of ionic compounds, including many nitrates, nitrites, cyanides and thiocyanates. Most ammonium salts are soluble and act as acids in liquid ammonia solutions. The solubility of halide salts increases from fluoride to iodide.
Nitrogen trihydride has the chemical formula NH3. It consists of a single nitrogen atom and three hydrogen atoms; these atoms are chemically bonded together. Continue Reading. Nitrogen trihydride, or NH3, is a covalent compound with a single nitrogen atom linked to three hydrogen atoms.