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Secondly, which process is endothermic the evaporation of water from the skin? You can determine this by heating liquid water on the stove, it will boil into a gas. Thus liquid water needs to receive energy (from an outside source) to evaporate. This is the very definition of an endothermic process.
These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat-absorbing processes: Melting ice cubes. Melting solid salts. Evaporating liquid water. Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.
Is ch4 2o2 co2 2h2o endothermic or exothermic? It is not an endothermic reaction. Combustion always involves the addition of O2,in combustion always energy is released and this energy is used to break the bonds of reactants. So combustion of methane is an exothermic reaction. CH4 +O2 gives CO2+H2O,∆H=-21 KCal.
An Endothermic Reaction will have an Endothermic change, whereby energy (In the form of heat) is absorb from the surrounding. Is melting a chemical or physical change? That means that physical change is transforming a solid into a liquid or gas, or a liquid into a solid or gas, or a gas into a liquid or solid.
Concrete Temperature Limits Least dimensions of sections, cm Minimum temperature of concrete as placed and maintained during the protection period, °C Less than 30.48 12.77 30.48 to less than 91.44 10 91.44 to less than 182.88 7.22 Greater than 182.88 4.44
Which is the best definition of activation energy? the energy required to end a chemical reaction. the energy required to bind a substrate to an active site. the energy required to break the bonds of reactant molecules. the energy required to re-form bonds in product molecules.
According to Stevens' definition, a loudness of 1 sone is equivalent to 40 phons (a 1 kHz tone at 40 dB SPL). With this exponent, each 10 phon increase (or 10 dB at 1 kHz) produces almost exactly a doubling of the loudness in sones.
Definition. A centralized Inventory is an inventory management system whereby operations are carried out in a central location. On the other hand, a decentralized inventory is an inventory management system where products move from a central office to other locations that are close to the customer.
Explanation: Entropy decreases when the number of moles of gas decreases during a reaction. In the case of the correct answer, the number of moles of gas decreases from two to one.
Definition: MSTr (mean square treatment) provides a measure of the spread among the. sample means ¯x1, ¯x2, , ¯xk (between-samples variation) by providing a weighted. average of the squared differences between the sample means and the grand mean ¯¯x: MSTr =