Energía química

Chemical reactions involve energy changes. Breaking bonds requires energy, while forming new bonds releases energy. If the energy of the product bonds is greater than that of the reactants, the reaction is exothermic, releasing energy as heat.

What is always required when chemical bonds are broken?

• Release of energy

• Addition of energy

• No energy change

• Energy transformation

What happens when new chemical bonds are formed?

• Energy is absorbed

• Energy is released

• Energy is transformed

• No energy change

In an exothermic reaction, how does the energy of the products compare to the reactants?

• Higher than reactants

• Lower than reactants

• Equal to reactants

• Unrelated to reactants

What is released in the form of heat during an exothermic reaction?

• Light

• Sound

• Matter

• Energy

Which type of reaction involves the release of energy as heat?

• Endothermic

• Exothermic

• Neutral

• Catalytic