Question

how would you know if the given reaction is an exothermic or endothermic reaction​

Answer 1

If one of the product is heat energy then it is an Exothermic and if the reaction took place in presence of heat then it is Endothermic.

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Answer 2

$\large{ifthereactionisexothermicthenheatisrealeased}$

for example

$\large{reacrionofBaclandNaSo4}$

realeases heat if you want to check then touch the test tube it become warm

$\large{heatisabsorbedinthereactionofendotheric}$

for example

$\large{2Agbr------sunlight----2Ag+br2}$

the sunlight is absorbed in the above reaction to break down the reaction