Search results
Results From The WOW.Com Content Network
Although aqua regia is an unstable mixture that continually gives off fumes containing free chlorine gas, this chlorine gas appears to have been ignored until c. 1630, when its nature as a separate gaseous substance was recognised by the Brabantian chemist and physician Jan Baptist van Helmont. [15] [en 1] Carl Wilhelm Scheele, discoverer of ...
As chlorine is denser than air, it can be easily collected by placing the tube inside a flask where it will displace the air. Once full, the collecting flask can be stoppered. Another method for producing small amounts of chlorine gas in a lab is by adding concentrated hydrochloric acid (typically about 5M) to sodium hypochlorite or sodium ...
The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions. The chemical reaction is typically a hydrocarbon or other organic molecule reacting with oxygen to form carbon dioxide and water and release heat. It may be expressed with the quantities: energy/mole of fuel
The chlorine atom, written often as Cl., behaves very differently from the chlorine molecule (Cl 2). The radical Cl. is long-lived in the upper atmosphere, where it catalyzes the conversion of ozone into O 2. Ozone absorbs UV-B radiation, so its depletion allows more of this high energy radiation to reach the Earth's surface.
The reaction at the anode results in chlorine gas from chlorine ions: 2 Cl − → Cl 2 + 2 e −. The reaction at the cathode results in hydrogen gas and hydroxide ions: 2 H 2 O + 2 e − → H 2 + 2 OH −. Without a partition between the electrodes, the OH − ions produced at the cathode are free to diffuse throughout the electrolyte to the ...
On the other hand, the chlorine gas goes from an oxidation of 0 (also a pure element) to −1: the chlorine gains one electron and is said to have been reduced. Because the chlorine is the one reduced, it is considered the electron acceptor, or in other words, induces oxidation in the sodium – thus the chlorine gas is considered the oxidizing ...
The chemical fire sent chlorine into the air, ... the chlorine smoke closed schools and led to a shelter-in-place order for more than 90,000 residents east of Atlanta while some were told to ...
Chemical energy is the energy of chemical substances that is released when the substances undergo a chemical reaction and transform into other substances. Some examples of storage media of chemical energy include batteries, [1] food, and gasoline (as well as oxygen gas, which is of high chemical energy due to its relatively weak double bond [2] and indispensable for chemical-energy release in ...