Question

1) A researcher can determine that an exothermic reaction has occurred in a flask if:

A) the flask feels cool.

B) lots of particle movement is visible.

C) the flask feels warm.

D) minimal particle movement is visible.
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2) In a certain reaction, molecules are moving faster and colliding more often as reactants turn into products. Which action is happening?

A) Heat is being absorbed; the reaction is endothermic.

B) Heat is being passed; the reaction is endothermic.

C) Heat is being passed; the reaction is exothermic.

D) Heat is being absorbed; the reaction is exothermic.

Answer 1

1) A researcher can determine that an exothermic reaction has occurred in a flask if the flask feels warm.

2) Heat is being absorbed; the reaction is endothermic

Exothermic and Endothermic reactions

In exothermic reactions, heat is liberated to the surrounding from the reaction vessels while for endothermic reactions, heat is absorbed from the surrounding.

Thus, a reaction can be determined to be exothermic just by feeling warmness from the reaction vessel.

More on exothermic and endothermic reactions can be found here: https://brainly.com/question/4345448?referrer=searchResults