How do you determine if a reaction is endothermic or exothermic?

[topsyturvy]

i need help on the calculation speed of reaction.
How to determine whether it is endothermic or exothermic?

somebody help pls. thanks lotsa

 

[Gokul43201]

If you post a specific question as well as whatever you know about solving it, we can help you. Without a context, your question is meaningless - we need more input from you, if we are to help you.