Question

1. which of the following is not true of endothermic reactions?

endothermic reactions absorb more energy than they give off.
evaporation is an example of an endothermic reaction.
there is more stored energy in the bonds of the products than in the bonds of the reactants.
in an endothermic reaction, excess energy is released as heat.

Explanation:

• Endothermic reactions absorb energy. So, they absorb more energy than they give off. This makes the first statement true.
• Evaporation (like water turning into vapor) requires heat absorption. So, evaporation is an endothermic process. This makes the second statement true.
• In endothermic reactions, since energy is absorbed, the products have more stored energy in their bonds than the reactants. This makes the third statement true.
• In endothermic reactions, energy is absorbed, not released as heat (that's for exothermic reactions). So, the fourth statement is false.

Answer:

In an endothermic reaction, excess energy is released as heat.