what are the indicators of a chemical change

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Chemical changes occur when a substance changes its chemical composition. Physical changes do not change a substance鈥檚 chemical composition. Chemical changes have 5 major indicators:odor production, temperature change, gas production, precipitation, and color change.

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What Are Five Indicators of a Chemical Change? What Are Five Indicators of a Chemical Change? Five indicators of a chemical change are color change, temperature change, precipitate formation, gas bubble formation and smell or taste change.

Chemical changes are distinguishable from physical changes by five major indicators. If at least one of these indicators is present during a change in matter, a chemical change is probably occurring. The five major indicators of chemical changes are:

Indicators are weak acids or weak bases that show a change in colour as the concentration of Hydrogen ions in a solution changes or the pH of a solution changes. The indicators dissociate slightly in the water to form ions. Some examples of indicators are Litmus, turmeric, phenolphthalein, etc.

A change in color is a sign that a chemical change might be taking place. An example of a reaction which causes a color change is the rusting of iron. In this reaction, iron reacts with oxygen in the presences of water.