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ash (combustion) ash (combustion)
ash in chemistry, solid residue of combustion. The chemical composition of an ash depends on that of the substance burned. Wood ash contains metal carbonates (e.g., potassium carbonate) and oxides formed from metals originally compounded in the wood. Coal ash usually has a high content of minerals... Read more
Chemical synthesis Chemical synthesis
Synthesis, Chemical Resources Chemical synthesis is the preparation of a compound, usually an organic compound, from easily available or inexpensive commercial chemicals. Compounds are prepared or synthesized by performing various chemical reactions using an inexpensive starting material and... Read more
Haber process Haber process
Haber process , commercial process for the synthesis of ammonia , NH 3 . Pure hydrogen and nitrogen gases are mixed in the appropriate proportion, heated to between 450°C and 600°C, compressed to about 1,000 atmospheres pressure, and passed over a catalyst. The reaction is 3H 2 +N 2 [double... Read more
catalyst catalyst
catalyst substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing of the reaction rate by use of a catalyst is called catalysis. Substances that increase the rate of reaction are called positive catalysts or, simply,... Read more
molecular modeling molecular modeling
molecular modeling the computer simulation, by various means, of chemical structures or processes. Special computer-graphics programs can display three-dimensional images of molecular structures and chemical processes, showing the distances and angles of chemical bonds and the modifications that... Read more
synthesis synthesis
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methane methane
methane , CH 4 , colorless, odorless, gaseous saturated hydrocarbon; the simplest alkane . It is less dense than air, melts at -184°C, and boils at -161.4°C. It is combustible and can form explosive mixtures with air. Methane occurs naturally as the principal component of natural gas ; it... Read more
Kinetics Kinetics
Kinetics Chemical kinetics is the study of the rates of chemical reactions. Such reaction rates range from the almost instantaneous, as in an explosion, to the almost unnoticeably slow, as in corrosion. The aim of chemical kinetics is to make predictions about the... Read more
phosgene phosgene
phosgene , colorless poison gas , first used during World War I by the Germans (1915). When dispersed in air, the gas has the odor of new-mowed hay. The gas is highly toxic; when inhaled it reacts with water in the lungs to form hydrochloric acid and carbon monoxide. Because the upper respiratory... Read more
Endothermic reactions Endothermic reactions
Endothermic Reaction In a chemical reaction, reactants are converted into products by the breaking and making of chemical bonds. An example is the burning of carbon in oxygen to make carbon dioxide. Bond breaking requires energy, while bond making releases energy. The balance between the two gives... Read more

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