Chemical energy transforming into other forms: Examples for Grade 7.

📚 Quick Study Guide

• 🔥 Chemical Energy: Energy stored in the bonds of atoms and molecules. This energy is released during chemical reactions.
• 💡 Transformation: Chemical energy can change into other forms of energy like heat, light, electrical, and mechanical energy.
• 🧪 Combustion (Burning): A chemical process that involves rapid reaction between a substance with an oxidant, usually oxygen, to produce heat and light. Example: Burning wood transforms chemical energy into heat and light.
• ⚡ Batteries: Batteries use chemical reactions to convert chemical energy into electrical energy.
• 🍎 Food: Our bodies convert the chemical energy in food into mechanical energy (for movement), thermal energy (to keep us warm), and other forms needed for life processes.
• 🌱 Photosynthesis: Plants convert light energy from the sun into chemical energy in the form of sugars.

Practice Quiz

1. Which of the following is the BEST example of chemical energy transforming into heat and light energy?
   1. A. A light bulb glowing
   2. B. A car engine running
   3. C. Burning wood in a fireplace
   4. D. A fan spinning
2. What type of energy transformation occurs in a battery?
   1. A. Electrical to chemical
   2. B. Chemical to electrical
   3. C. Mechanical to electrical
   4. D. Light to chemical
3. When you eat food, what is ONE of the main energy transformations that occurs in your body?
   1. A. Chemical to mechanical
   2. B. Light to chemical
   3. C. Electrical to chemical
   4. D. Mechanical to light
4. Photosynthesis is a process where plants transform which of the following?
   1. A. Chemical energy to light energy
   2. B. Mechanical energy to chemical energy
   3. C. Light energy to chemical energy
   4. D. Electrical energy to mechanical energy
5. Which of these is NOT an example of chemical energy transformation?
   1. A. Burning coal
   2. B. A car battery powering headlights
   3. C. A solar panel generating electricity
   4. D. Digestion of food
6. What energy transformation happens when dynamite explodes?
   1. A. Mechanical to chemical
   2. B. Chemical to heat and light
   3. C. Electrical to mechanical
   4. D. Heat to chemical
7. In a gasoline-powered car, what is the primary energy transformation that allows the car to move?
   1. A. Electrical energy to mechanical energy
   2. B. Chemical energy to mechanical energy
   3. C. Solar energy to chemical energy
   4. D. Mechanical energy to chemical energy