Which of the following is the weakest bond?
(a) H-bond is only an interaction between electronegative element and hydrogen therefore, it is the weakest bond among all.
Why is Bond making exothermic?
Bond forming is an exothermic process, because it releases energy. In reaction profile diagram, the energy change in a reaction, is the difference between the reactants and products. The energy of the products is higher than the energy of the reactants. In an exothermic reaction, energy is released to the surroundings.
Is the formation of bonds always exothermic?
Bond formation is alway strictly exothermic in the sense of the change of enthalpy. exothermic reaction A reaction for which the overall standard enthalpy change ΔH∘ is negative. A bond can only exist, if it needs energy to break it, i.e. the bond dissociation energy is always positive.
Which is an example of an exothermic phase change?
Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always exothermic.
Is the freezing of water exothermic?
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
What is the phase change?
A phase change is when matter changes to from one state (solid, liquid, gas, plasma) to another. (see figure 1). These changes occur when sufficient energy is supplied to the system (or a sufficient amount is lost), and also occur when the pressure on the system is changed.
What causes the phase change in matter?
Phase changes require either the addition of heat energy (melting, evaporation, and sublimation) or subtraction of heat energy (condensation and freezing). Changing the amount of heat energy usually causes a temperature change.
What causes properties to change?
The most frequent cause of value change is a change in the general real estate market. As demand for property goes up, prices tend to go up. As demand decreases, so do prices. An individual property can also change in value due to changes to the property itself.