0

Guest

Courses New

How to know which reaction is exothermic or endothermic reaction without testing. Give a trick to know about this reaction

How to know which reaction is exothermic or endothermic reaction without testing. Give a trick to know about this reaction 

Grade:10

2 Answers

Arun
25750 Points
5 years ago
Dear student
 
we can’t define this only by seeing. 
 if the sum of the enthalpies of the reactants is greater than the products, the reaction will be exothermic. If the products side has a larger enthalpy, the reaction is endothermic.
Rajdeep
231 Points
5 years ago
HELLO THERE!
 
Heat is not a visible quantity.
When a reaction proceeds, just by seeing you can’t say whether it is endothermic or exothermic.
 
To make the reaction proceed, if you need to give heat, then the reaction is endothermic because it is requiring to absorb heat.
On the other hand, if heat is released, then it is exothermic process.
 
When the process is exothermic, and heat is released, Enthalpy change (H) is negative.
When the process is endothermic, and heat is absorbed, Enthalpy change (H) is positive.
 
Example, Haber’s process (Process to prepare ammonia from Nitrogen and hydrogen, using iron dust as catalyst and molybdenum as promoter) is an exothermic process.
 
THANKS!

Think You Can Provide A Better Answer ?

Other Related Questions on 10 grade science

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More