Question

Explain, giving one example for each of the following
chemical changes:
(a) Double decomposition (b) Thermal dissociation
(c) Reversible reaction (d) Displacement​

Answer 1

Explanation :

a) double decomposition (plural double decompositions) (chemistry) a reaction between two substances in which two parts of each substance are exchanged; metathesis. For eg, This is a type of chemical change in which two compounds in a solution react to form two new compounds by mutual exchange of radicals.

b) a chemical reaction in which a substance decomposes reversibly when the temperature is raised. Since the evolved gas may overcome the pressure of the ambient medium, the decomposition process is sharply accelerated when this temperature is reached. For eg, Answer. A substance undergoing thermal dissociation may form several substances (2H2O ⇄ 2H2 + O2, CaCO3 ⇄ CaO + CO2) or a single,exsimpler substance (N2O4 ⇄ 2NO2, Cl2 ⇄ 2C1).

c) A reversible reaction is a reaction where the reactants and products react together to give the reactants back. For Eg, One example of a reversible reaction is the reaction of hydrogen gas and iodine vapor to from hydrogen iodide. ... In the forward reaction, hydrogen and iodine combine to form hydrogen iodide. In the reverse reaction, hydrogen iodide decomposes back into hydrogen and iodine.

d) Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position. For Eg, If an object moves relative to a reference frame—for example, if a professor moves to the right relative to a whiteboard, or a passenger moves toward the rear of an airplane—then the object's position changes. This change in position is known as displacement.