Question

3 as cookies bake, several chemical reactions occur. most of these reactions are endothermic. what does this mean? a they release more energy than they absorb b they absorb more energy than they release c they do not release any energy when new bonds form d they require less energy than exothermic reactions

Explanation:

An endothermic reaction is defined as a reaction where the system absorbs energy. This means the energy absorbed during bond - breaking (reactant bonds) is greater than the energy released during bond - forming (product bonds).

• Option A: This is the description of an exothermic reaction (releases more energy than it absorbs), so it is incorrect.
• Option B: Correctly describes an endothermic reaction as absorbing more energy than it releases.
• Option C: All chemical reactions involve energy changes when bonds form (even if it is less than the energy absorbed). So, this option is incorrect.
• Option D: Endothermic reactions generally require more energy input (to break reactant bonds) compared to exothermic reactions (which release energy overall), so this option is incorrect.

Answer:

B. They absorb more energy than they release