In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction. This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products.
In which type of reaction do the reactants have less energy than the products?
in endothermic reactions the reactants are lower than the products.
Which is more stable the reactants or products?
Low energy can be thought of as providing a greater degree of stability to a chemical system. Since the energy of the system decreases during an exothermic reaction, the products of the system are more stable than the reactants.
Why is enthalpy important in real life?
The most important function of this law may be in industries that use the burning of fuel, such as in cars or for everyday energy. The industries can measure how much energy each fuel releases when it is burned, so that they can make efficient energy choices and save money.
Is spontaneous negative or positive?
negative, the process is spontaneous and may proceed in the forward direction as written. positive, the process is non-spontaneous as written, but it may proceed spontaneously in the reverse direction. zero, the process is at equilibrium, with no net change taking place over time.
Which chemical reaction is always spontaneous?
A reaction which is exothermic (ΔH negative) and results in an increase in the entropy of the system (ΔS positive) will always be spontaneous.
Does increasing entropy increase stability?
A system which is more disordered in space will tend to have more disorder in the way the energy is arranged as well. … The entropy has increased in terms of the more random distribution of the energy. In essence . . . “a system becomes more stable when its energy is spread out in a more disordered state“.