Question 4
3 pts
(07.01 LC)
Which of the following happens during an exothermic chemical change? (5 points)
Heat is absorbed.
Heat is released.
Net energy increases.
Net energy remains constant.
113911

Heat is released.

Explanation:

In an exothermic reaction, the reactant(s) move into a more stable state when they form into the product(s). Thus, the excess energy is released in the form of heat.

Conversely, in an endothermic reaction, the reactant(s) move into a more unstable state. In doing so, energy is required for the chemical reaction to occur to force the reactant(s) into a less stable state. So, energy is absorbed to make the reaction occur.

Also, since energy was released, the net energy decreased. If energy was absorbed in an endothermic reaction, the net energy would increase.

Therefore, the answer is 'Heat is released'.

Because kinetic energy is proportional to the velocity squared, increases in velocity will have an exponentially greater effect on translational kinetic energy. Doubling the mass of an object will only double its kinetic energy, but doubling the velocity of the object will quadruple its velocity.

hope this helps