In the case of nuclear reactions, the Q value is simply the mass of the reactants minus the mass of the products (the reverse of most of chemistry). A positive Q value implies that the reaction is exothermic and that over time the reaction will tend towards the products. The reverse is...
Why do reactants become hotter during exothermic reactions when they are losing energy and why do reactants become colder when they are gaining energy in endothermic reactions? How can the amount of oxygen consumed be used to help us understand the activity level of the cells?
For a one-electron atom or ion, spin-orbit coupling splits all states except s states into doublets. Why are s states exceptions to this rule? Why do reactants become hotter during exothermic reactions when they are losing energy and why do reactants become colde...
If you supply the energy for a molecule to form when it wouldn't energetically want to form in the first place, then in essence you are making it exothermic. However, don't really think of it like this. Everything in that upper paragraph would get me laughed at from all chemists, I ...
The heat produced by concrete during curing is called heat of hydration. This exothermic reaction occurs when water and cement react. The amount of heat produced during the reaction is largely related to the composition and fineness of the cement....
The hottest part of a flame is the point ofmaximum combustion, which is the blue portion of a flame (if the flame burns that hot). However, most students performingscience experimentsare told to use the top of the flame. Why? Because heat rises, so the top of the flame's cone is a...
» Thus, energy released from other reactions is utilized to resynthesize ATP. The Phosphocreatine System » Phosphocreatine is a high-energy compound. » This system supplies instantaneous energy for a short duration. » Like ATP, it can lose its phosphate group in an exothermic reaction ...
it allows chemistries that are not possible if you only used slaked lime, producing high-temperature-associated compounds that would not otherwise form. Second, this increased temperature significantly reduces curing and setting times since all the reactions are accelerated, allowing for much faster cons...
Monitoring the temperature of the concrete during phase III and IV is a quality control component that is regularly performed. The main reason behind this measurement is to ensure the concrete does not reach temperatures that are too high or too low. This allows proper strength development and im...
Why are combustion reactions of fossil fuels so exothermic? How and why could abrupt climate change occur? Why does deforestation cause climate change? How do carbonate ions affect ocean acidification? Why does temperature decrease with higher altitude in the troposphere? Why is carbon dioxide good...