A scientist is studying a previously unknown chemical reaction. She concludes that it is exothermic. What must the scientist have observed?

The reaction released heat.

The reaction formed a gas.

The reaction sped up when a catalyst was added.

The reaction caused the container to get cold.

Question

A scientist is studying a previously unknown chemical reaction. She concludes that it is exothermic. What must the scientist have observed?

The reaction released heat.

The reaction formed a gas.

The reaction sped up when a catalyst was added.

The reaction caused the container to get cold.

anonymous · Answer

@Michele_Laino , @matt101

matt101 · Answer

Which do you think? Btw, would be good for you to post your answer and your reason for choosing your answer for multiple choice questions like this.

michele_laino · Answer

Hint:
by definition, a reaction is exothermic, when that reaction released heat.