Which of the following contains chemical energy?

• A. Glucose (C6H12O6)
• B. Visible light
• C. Sound waves
• D. Pure water (H2O) vapor

Answer: (A)

Verified step by step guidance

1. Understand that chemical energy is the energy stored in the bonds of chemical compounds, which can be released or absorbed during chemical reactions.
2. Analyze each option to determine if it contains chemical bonds that store energy:
3. Visible light is a form of electromagnetic energy, not stored in chemical bonds, so it does not contain chemical energy.
4. Sound waves are mechanical energy transmitted through vibrations in a medium, not stored in chemical bonds, so they do not contain chemical energy.
5. Pure water (H2O) vapor consists of molecules with chemical bonds, but water is a stable compound with relatively low chemical energy compared to organic molecules like glucose.
6. Glucose (C6H12O6) is an organic molecule with many carbon-hydrogen and carbon-carbon bonds, which store significant chemical energy that can be released during metabolic reactions.