During an exothermic reaction; light and heat are released into the environment.
An exothermic reaction is one in which heat is released to the environment. This heat can be physically observed sometimes like in an a combustion reaction.
In an exothermic reaction, the enthalpy of the reactants is greater than the enthalpy of the products.
This heat lost is sometimes felt as the hotness of the vessel in which the reaction has taken place.
In conclusion, light and heat are released into the environment in an exothermic reaction.
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Volume is the amount of space an object or substance takes up, so if they are the same size then they will have the same volume. If you wish to test this, get a beaker, fill it up to one of the lines and make sure tou remeber which line, then place one ball in gently and see how muchbit went up, then take that ball out and do the same with the other. The results should be the same.
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An alpha particle is identical to a helium nucleus ... 2 protons, 2 neutrons. <em>(1)</em>
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James Webb has been designed to focus on the infrared part of the spectrum from 0.6 (red light) to 28 microns (infrared). This means it won't be able to see in ultraviolet light like Hubble, but will be able to focus on infrared bright objects like extremely distant galaxies.