Question

which energy transformation occurs in an endothermic reaction? (1 point)
energy from the surroundings is stored in the chemical bonds of the products.
there is a net flow of energy from the surroundings into the system.
there is a net flow of energy from the system out to the surroundings.
energy from the chemical bonds of the reactants is released to the surroundings.

Explanation:

To determine the energy transformation in an endothermic reaction, we recall the definition of an endothermic reaction: a reaction where the system (the reaction itself) absorbs energy from the surroundings. Let's analyze each option:

• Option 1: While energy is stored in products in some cases, the key of endothermic is energy flow, not just storage. This is not the best description.
• Option 2: In an endothermic reaction, the system (the reaction) takes in energy from the surroundings. So there is a net flow of energy from the surroundings into the system. This matches the definition.
• Option 3: A net flow of energy from the system to the surroundings is an exothermic reaction, not endothermic.
• Option 4: Releasing energy from reactants to surroundings is exothermic, not endothermic.

Answer:

B. There is a net flow of energy from the surroundings into the system.