Question

Your teacher directs you to combine two liquid substances into a flask. after you combine them, you notice that the flask feels cold when you touch it. which if the following best depicts what happened?

A: an endothermic reaction has taken place

B: an exothermic reaction has taken place

C: the liquid has reached its freezing point

D: you have made an error because the flask should have gotten warmer, not colder

Answer 1

Answer : The correct option is (A).

Explanation :

• Endothermic reaction : When two liquids are combine into a flask, then the flask feels cold when we touch it because the system absorbed heat from the surrounding.

In general, endothermic process absorbs heat and cool the surrounding.

• Exothermic reaction : When two liquids are combine into a flask, then the flask feels hot when we touch it because the system released heat into the surrounding.

In general, exothermic process releases heat and rise the temperature of surrounding.