Question

49. What is meant by
a. Precipitation reaction
b. Exothermic reaction
C. Oxidation reaction write the balance chemical equations for an example of each​

Answer 1

Answer:

a. A precipitation reaction refers to the formation of an insoluble salt when two solutions containing soluble salts are combined. The insoluble salt that falls out of solution is known as the precipitate, hence the reaction's name. Precipitation reactions can help determine the presence of various ions in solution.

b. An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”

c. The term oxidation was originally used to describe reactions in which an element combines with oxygen. Example: The reaction between magnesium metal and oxygen to form magnesium oxide involves the oxidation of magnesium. ... In the course of this reaction, each magnesium atom loses two electrons to form an Mg2+ ion.

Answer 2

Answer:

(a) Precipitation reaction:

Definition:

A reaction in which there is a formation of an insoluble substance (Precipitate) as a product, is known as a precipitation reaction. This insoluble substance is called a Precipitate.

Example:

$BaCl_2 (aq) + Na_2SO_4 (aq) -->BaSO_4 (s) + 2 NaCl (aq)$

On reacting Sodium Sulphate ($Na_2SO_4$) with Barium Chloride ($BaCl_2$) , a precipitate of Barium Sulphate ($BaSO_4$) is formed.

(b) Exothermic Reaction:

Definition:

A reaction in which there is a release of energy either in the form of heat or light is known as an Exothermic Reaction.

Example:

$CaO + H_2O --> Ca(OH)_2$

On adding water to calcium oxide, there is a release of heat energy due to formation of Calcium Hydroxide.

(c) Oxidation Reaction:

Definition:

A reaction in which there is:

1. Loss of electrons
2. Loss of Hydrogen &
3. Gain of Oxygen

is known as an Oxidation Reaction.

Example:

$2Mg + O_2 --> 2MgO$

When magnesium (Mg) reacts with oxygen ($O_2$) present in the atmosphere, Magnesium undergoes oxidation to form Magnesium oxide (MgO)

Hope you got each and every definition along with the examples.

Thank You.