Question

energy in chemical reactions i online practice
complete this assessment to review what youve learned. it will not count toward your grade.
which event occurs during an endothermic reaction? (1 point)

• heat and light are absorbed from the environment.
• heat is released to the environment, while light is absorbed.
• heat and light are released to the environment.
• light is released to the environment, while heat is absorbed.

Explanation:

An endothermic reaction is defined as a chemical reaction that absorbs energy from the surroundings, often in the form of heat (and sometimes light). So, during an endothermic reaction, heat and light (or energy) are taken in from the environment. Let's analyze each option:

• Option 1: "Heat and light are absorbed from the environment." This matches the definition of an endothermic reaction as it involves absorbing energy (heat and light) from the surroundings.
• Option 2: Releasing heat and absorbing light is not characteristic of an endothermic reaction (endothermic should absorb, not release heat).
• Option 3: Releasing heat and light is characteristic of an exothermic reaction (releases energy), not endothermic.
• Option 4: Releasing light and absorbing heat is an inconsistent combination for an endothermic reaction (endothermic should absorb energy, not release light in general as a defining feature, and the main energy change is absorption of heat/energy).

Answer:

A. Heat and light are absorbed from the environment.