Chemical Change (1958)

Email us at footage@avgeeks.com if you have questions about the footage and are interested in using it in your project. This film explores the concept of chemical change, differentiating it from physical change through various examples. It illustrates how chemical changes involve the formation of new substances with different properties, such as wood burning into ash and smoke, or mercury combining with oxygen to form mercuric oxide. Conversely, physical changes, like ice melting or mercury expanding, alter the form but not the chemical identity of a substance. The film demonstrates how chemical reactions can be reversed, as seen when mercuric oxide is broken down into mercury and oxygen, or when silver sulfide (tarnish) is removed from silver. It also touches upon how understanding chemical changes helps in agriculture, for example, by identifying soil acidity through litmus paper tests, and highlights the beauty and practical applications of chemical transformations in the world around us. Keywords: chemical change, physical change, new substances, elements, compounds, mercury, oxygen, mercuric oxide, silver, sulfur, silver sulfide, tarnish, iron, rust, iron oxide, carbon, fire, acid, base, litmus paper, agriculture, fertilizer