Search results
Results from the WOW.Com Content Network
In physical chemistry, the Arrhenius equation is a formula for the temperature dependence of reaction rates.The equation was proposed by Svante Arrhenius in 1889, based on the work of Dutch chemist Jacobus Henricus van 't Hoff who had noted in 1884 that the Van 't Hoff equation for the temperature dependence of equilibrium constants suggests such a formula for the rates of both forward and ...
Thermal conduction rate, thermal current, thermal/heat flux, thermal power transfer P = / W ML 2 T −3: Thermal intensity I = / W⋅m −2: MT −3: Thermal/heat flux density (vector analogue of thermal intensity above) q
[19] [20] This is explained by the two-step mechanism: and +. Certain cationic polymerization reactions have negative activation energies so that the rate decreases with temperature. For chain-growth polymerization , the overall activation energy is E = E i + E p − E t {\displaystyle \textstyle E=E_{i}+E_{p}-E_{t}} , where i, p and t refer ...
An entropic explosion is an explosion in which the reactants undergo a large change in volume without releasing a large amount of heat.The chemical decomposition of triacetone triperoxide (TATP) may be an example of an entropic explosion. [1]
Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. . This measurement provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and ...
Due to this thermal lag, two phase transformations (or chemical reactions) occurring in a narrow temperature range might overlap. Generally, heating or cooling rates are too high to detect equilibrium transitions, so there is always a shift to higher or lower temperatures compared to phase diagrams representing equilibrium conditions.
Chemistry in dating is important, but it doesn't always come instantaneously. Here's why you shouldn't give up on someone just because you didn't feel a spark right away.
CaCO 3 → CaO + CO 2 The reaction is used to make quick lime, which is an industrially important product. Another example of thermal decomposition is 2Pb(NO 3) 2 → 2PbO + O 2 + 4NO 2. Some oxides, especially of weakly electropositive metals decompose when heated to high enough temperature.