energy indicators

There are two types of reactions based on heat changes involved: exothermic and endothermic. Exothermic - Most of reactions we call burning are exothermic. They give out heat. This is indicated by writing '+ Heat' on the products side of an equation. For Example: Combustion of Coal Burnin..

fig 6.12 - Distribution of kinetic energy of molecules in a gas It is observed that the energy distribution curve is flatter at higher T and is shifted toward higher energy region. This is because, the kinetic energy of the molecules are higher at higher temp..

Internal Energy and Change in Internal Energy - Since chemical changes are always accompanied by energy changes, it indicates that reactants and products must be having certain amounts of energy. A fixed quantity of any substance is associated with ..

The ionization energies of halogens are very high. This indicates that they have very little tendency to lose electrons. However, on going down the group from fluorine to astatine, the ionization energy decreases. This is due to gradual increase in atomic size, which ..

The minus sign of lattice energy indicates that the energy is released from ions in the gaseous state, during the formation of solid ionic compound. An ionic bond is formed through the steps described above. Now, if the total energy released is more than that..

An atomic nucleus is a stable structure. The nucleus is bound by very strong short range forces called nuclear forces. Certain amount of work has to be done to separate the nucleons to such a distance that there is no interaction. This work done therefore measures binding energy of the nu..

The storage and expenditure of energy in an ecosystem is in accordance with the laws of thermodynamics (basic laws of thermodynamics). The first law of thermodynamics is the law of conservation of energy, which says that 'energy can neither be created nor destroyed b..

2 due to q 1 . where 'r 1 2 ' is the distance between points 1 and 2. As the electrostatic force is conservative, the work done is stored as potential energy and is given by The potential 'V' would be same, even if the charge q 2 is brought from infinity to a point first and then ..

fig 6.11 - Illustration of energy barrier and activation energy involved in a reaction Each reaction has a characteristic value of energy of activation. At a given temperature, a reaction with low activation energy will proceed faster than a reaction with hig..

Born Haber cycle for ArCl (s) The + ve value of D H f indicates that net energy is required for this process. Hence, formation ArCl is energetically unfavourabl..