![]() The explosion of nitroglycerin is a chemical change because the gases produced are very different kinds of matter from the original substance. Mixing baking soda and vinegar to produce carbon dioxide gas. Another example of a chemical change is the reaction of baking soda and vinegar, which produces carbon dioxide gas and a new substance, sodium acetate. The rust has different properties than the iron, it is a different color and is more brittle. The formation of rust is a chemical change because rust is a different kind of matter than the iron, oxygen, and water present before the rust formed. One example of a chemical change is when iron reacts with oxygen to form iron oxide, also known as rust. These reactions occur when two substances (called reactants) are added together to create one new substance. A chemical change always produces one or more types of matter that differ from the matter present before the change. Combination reactions, also called synthesis reactions, are the opposite of decomposition reactions. For example, if a metal is to be extracted from an ore, such as iron from iron ore, we need to carry out a series of chemical changes. All new substances are formed as a result of chemical changes. Chemical changes are very important in our lives. To identify a chemical reaction, we look for a chemical change. A chemical change is also called a chemical reaction. A chemical change occurs when the substances composition is changed. (D) A banana turning brown is a chemical change as new, darker substances that have a different taste form (Bruno Emmanuelle via Unsplash). Chemical changes, on the other hand, are quite different. (B) A chemical reaction that gives off light, a process called chemiluminescence, occurs when a glow stick is bent, a crack is heard and the inner solutions mix together (Anton Darius via Unsplash). (C) Cooking red meat causes a number of chemical changes, including the oxidation of iron in myoglobin that results in the familiar red-to-brown color change (Justus Menke via Unsplash). ![]() (A) Copper and nitric acid undergo a chemical change to form copper nitrate and brown, gaseous nitrogen dioxide (unknown via Wikipedia Commons).
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