Question

which option is an example of chemical energy being transformed into thermal energy?
a. a furnace burning coal
b. lightning striking a signal tower
c. a woman rubbing her hands together for warmth
d. a plant storing energy from the sun in its leaves

Explanation:

• Option A: Coal has chemical energy. When it burns in a furnace, a chemical reaction occurs, and the chemical energy is transformed into thermal energy (heat).
• Option B: Lightning is electrical energy. Striking a signal tower involves electrical - mechanical and other energy transformations, not chemical - thermal.
• Option C: Rubbing hands is mechanical energy (due to motion) being transformed into thermal energy (due to friction), not chemical - thermal.
• Option D: A plant storing energy from the Sun is solar energy (light energy) being transformed into chemical energy (in the form of glucose etc.) through photosynthesis, not chemical - thermal.

Answer:

A. A furnace burning coal