Search results
Results from the WOW.Com Content Network
2 NaN 3 → 2 Na + 3 N 2. The same reaction occurs upon heating the salt to approximately 300 °C. The sodium that is formed is a potential hazard alone and, in automobile airbags, it is converted by reaction with other ingredients, such as potassium nitrate and silica. In the latter case, innocuous sodium silicates are generated. [11]
[2] [3] The atoms in molecules, crystals, metals and other forms of matter are held together by chemical bonds, which determine the structure and properties of matter. All bonds can be described by quantum theory, but, in practice, simplified rules and other theories allow chemists to predict the strength, directionality, and polarity of bonds. [4]
The (3+2)-cycloaddition of azides to double or triple bonds is one of the most utilised cycloadditions in organic chemistry and affords triazolines (e.g. 17) or triazoles, respectively. [40] [41] [42] The uncatalysed reaction is a concerted pericyclic process, in which the configuration of the alkene component is transferred to the triazoline ...
Inorganic compounds exhibit a range of bonding properties. Some are ionic compounds, consisting of very simple cations and anions joined by ionic bonding.Examples of salts (which are ionic compounds) are magnesium chloride MgCl 2, which consists of magnesium cations Mg 2+ and chloride anions Cl −; or sodium hydroxide NaOH, which consists of sodium cations Na + and hydroxide anions OH −.
This bond length is consistent with a bond order between one and two. Unlike ozone ( O 3 ) the ground electronic state of nitrogen dioxide is a doublet state , since nitrogen has one unpaired electron, [ 12 ] which decreases the alpha effect compared with nitrite and creates a weak bonding interaction with the oxygen lone pairs.
GCSE Bitesize was launched in January 1998, covering seven subjects. For each subject, a one- or two-hour long TV programme would be broadcast overnight in the BBC Learning Zone block, and supporting material was available in books and on the BBC website. At the time, only around 9% of UK households had access to the internet at home.
In hazard identification, sources of data on the risks associated with prospective hazards are identified. For instance, if a site is known to be contaminated with a variety of industrial pollutants , hazard identification will determine which of these chemicals could result in adverse human health effects, and what effects they could cause.
The intent of the videos is to bring chemistry to a new generation of students and to get them enthused about science and understand how chemists think and what chemists are trying to do. [ 9 ] [ 10 ] Many school teachers now incorporate these videos into their classes, [ 4 ] [ 9 ] and the professor has even recorded video responses to some of ...