Matter And Energy: Chemical Change (1947)

The film explains the concept of chemical changes, where two or more materials combine to form entirely different substances. It highlights everyday examples of chemical changes, such as burning wood and the digestion of food. The film illustrates how molecules and atoms interact during these changes, using examples like the combination of mercuric chloride and potassium iodide to create mercuric iodide. It also discusses the process of photosynthesis, where plants convert carbon dioxide and water into sugar and oxygen using sunlight. The film emphasizes that chemical changes are fundamental to life and occur all around us, producing energy and new materials without loss.

Keywords
chemical change, molecules, atoms, mercuric chloride, potassium iodide, photosynthesis, energy, life, combustion, digestion
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