Science Assessment

During the reaction between methane and oxygen, bonds between the atoms that make up the methane and oxygen molecules are broken and new bonds are formed to create carbon dioxide and water molecules.

Which of the following describes the energy involved in breaking and forming bonds?

1. Energy is given off as bonds are broken, and energy is given off when bonds are formed.
2. Energy is given off as bonds are broken, but energy is required to form bonds.
3. Energy is required to break bonds, and energy is given off as bonds are formed.
4. Energy is required to both break bonds and to form bonds.