The solubility depends on a number of factors important amongst which are the lattice enthalpy of the salt and the solvation enthalpy of the ions in a solution. For a salt to dissolve in a solvent the strong forces of attraction between its ions (lattice enthalpy) must be overcome by the ion-solvent interactions. The solvation Read more about Solubility Equilibria of Sparingly Soluble Salts[…]
Principle: The work-energy theorem is a generalized description of motion that states that the work done by the sum of all forces acting on an object is equal to the change in that object’s kinetic energy.f = ma f = m dv/dt We know that dw = fdx w = ∫ f. dx = ∫ m. Read more about Work Energy Theorem[…]
We know that if, ΔG is negative, then the reaction is spontaneous and proceeds in the forward direction. ΔG is positive, then reaction is considered non-spontaneous. Instead, as reverse reaction would take place ΔG is 0, reaction has achieved equilibrium; at this point, there is no longer any free energy left to drive the reaction. Read more about Relationship between equilibrium constant K, reaction quotient Q and Gibbs energy G[…]
The weight of a body is felt due to a reactionary force applied on the body by some other body (which is in contact with the first body). For example, when we stand on a plane, we feel our weight due to the reaction of the plane on our feet. If under some special circumstances Read more about Weightlessness in Satellites[…]
Le Chatelier’s principle: It states that a change in any of the factors that determine the equilibrium conditions of a system will cause the system to change in such a manner so as to reduce or to counteract the effect of the change. This is applicable to all physical and chemical equilibria. 1. Effect of Read more about Factors affecting equilibria[…]
Moment of a force (or torque) is a physical quantity which tries to rotate or rotate a body about a given point or a given axis of rotation. Or the turning effect of a force acting on a body about an axis is called the moment of force or torque. Factors affecting the turning of a Read more about Torque[…]
When acids and bases are mixed in the right proportion they react with each other to give salts and water NaOH + HCl ® NaCl + H₂O Arrhenius Concept of Acids and Bases: According to Arrhenius theory, acids are substances that dissociates in water to give hydrogen ions H + (aq) and bases are substances Read more about Acids, bases and salts[…]
When a body repeats its motion after regular time intervals we say that it is in harmonic motion or periodic motion. The time interval after which the motion is repeated is called the time period. If a body moves to and fro on the same path, it is said to perform oscillations. Simple harmonic motion Read more about Simple Harmonic Motion[…]
Free Energy Change (ΔG): The two thermodynamic quantities which affect the spontaneity of a reaction are enthalpy (H) and entropy (S). The free energy is the amount of work that a thermodynamic system can perform The free energy of a substance such as its enthalpy or entropy is a characteristic property of the substance. In any reaction, the change in free Read more about Gibbs Energy change and Equilibrium[…]
Rolling motion is a combination of rotation and translation.All the particles on a rolling body have two kinds of velocity. Translational, which is the velocity of centre of mass Linear velocity on account of rotational motion When a rigid body moves on a surface Its motion is said to be pure rolling if there is Read more about Rolling Motion[…]