Chemical energy

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

What happens to energy during chemical reactions?

• It remains constant.

• It is always released.

• It can be released.

• It is always absorbed.

What is required to break chemical bonds?

• Absorption of energy

• Release of energy

• Energy remains constant

• No energy change

What happens when new bonds are formed?

• Energy is absorbed

• Energy is released

• Energy remains constant

• No energy change

When is a reaction considered exothermic?

• When reactants have more energy than products

• When no energy is released

• When products have more energy than reactants

• When energy is absorbed

What is the result of an exothermic reaction?

• Energy is absorbed as heat

• Energy is released as heat

• Energy remains constant

• No energy change