What would likely happen if you were to touch the flask in which an endothermic reaction were occuring?
a. the flask would probably feel cooler than before the reaction started.
b. the flask would probably feel warmer than before the reaction started.
c. the flask would feel the same as before the reaction started.
d. none of the above

A. The flask would probably feel cooler than before the reaction started.

Explanation: An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surroundings. The temperature of the surrounding decreases.

An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.

When an endothermic reaction takes place in the flask, the heat is absorbed by the flask and thus the temperature of the surrounding (here the flask) will decrease which can be felt by touching the outside of the test tube. Thus the flask would appear colder.

explanation:

newton's third law, for every action there is an equal and opposite reaction.