CHEM1001 Lecture Notes - Lecture 12: Solution, Egg White

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1 Aug 2016
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Chemical changes are also known as chemical reactions. The ingredients of a reaction are called the reactants, and the end results are called the products. The formation of gas bubbles is often the result of a chemical change. A chemical change might also result in the formation of a precipitate, such as the appearance of a cloudy material when dissolved substances are mixed. Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. Burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides. Yeast carries out fermentation to produce alcohol from sugar. An unexpected color change or release of odor also often indicates a chemical change. The color of the element chromium is determined by its oxidation state; a single chromium compound will only change color if it undergoes an oxidation or reduction reaction.

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