Question

Endothermic reactions are those which release heat.
A) True
B) False

Answer 1

Hint:The endothermic reaction happens in a thermodynamic process. The word Endo means within or internal and the word thermic means heat exchange. One can guess the meaning of the statement based on these words and decide whether this statement is true or false.

Complete answer:1) First of all we will learn about the thermodynamic heat exchange process. When a reaction takes place there is always either evolution or heat or absorption of heat.
2) The reaction takes place in a system and the exchange of heat takes place in between the system and surrounding.
3) In an endothermic reaction process the heat is taken from the surrounding by the system which means heat is absorbed in the reaction.
4) In an exothermic reaction process the heat is given to the surrounding by the system that means heat is evolved or released.
Therefore, the given statement endothermic reactions are those which release heat which is false which shows option B is the correct choice of an answer.

Note:In an endothermic reaction heat is absorbed that means the exchange of heat value is denoted by a negative sign. In an exothermic reaction, the heat is released which means the exchange of heat value is denoted by the positive sign. Whenever the heat sign is given on the arrow of a reaction that means heat is taken and the reaction is an endothermic type of reaction. Melting ice cubes and evaporation of water is an endothermic reaction where heat is absorbed.