what are signs of chemical change

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Indications of a chemical change include:Light Emission 鈥?Certain chemical reactions produce light as a result of the reaction.Bubbles 鈥?When a chemical change occurs in a liquid solution,it very often produces gas bubbles,which can be seen in the liquid.Change Of Color 鈥?A substance changing in color is an excellent indication that some form of chemical change has happened. …More items…

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1 Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. 2 Formation of a Precipitate. 3 Color Change. 4 Temperature Change. 5 Production of Light. 6 Volume Change. 7 Change in Smell or Taste.

You can tell there is a chemical change when it produces gas, light, smell, fire (heat), or color change. A chemical change may also be accompanied by the formation of a solid in the form of a precipitate, and in some cases, accompanied by a gain or loss of energy.

Signs Of Chemical Change Fireworks are examples of chemical changes. The light and heat produced are the results of chemical reactions that produce new compounds. Rust appearing on iron is an example of a chemical change. The rust is the result of iron oxide being created. Melting ice is an example of a physical change.

The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change. Challenge: food cooking, rust formation, tarnish forming on doorknobs, fuel burning for heat, tarnished penny.