A chemical change typically involves a transformation that results in the formation of new substances and is often indicated by certain observations. Here are some indicators that suggest a chemical change has occurred:
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Color Change: A substance changes color (e.g., iron rusting turns from shiny metal to reddish-brown).
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Gas Production: Bubbling or fizzing occurs, which may indicate gas is produced (e.g., vinegar reacting with baking soda).
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Temperature Change: The appearance of heat (exothermic reaction) or the absorption of heat (endothermic reaction), indicating a chemical process (e.g., combustion of wood releases heat).
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Precipitate Formation: A solid forms from a liquid solution (e.g., when mixing two clear solutions results in a cloudy solid).
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Change in Properties: New physical properties arise that differ from the original materials, such as changes in odor, taste, or texture.
If you observe one or more of these indicators, it's likely that a chemical change has taken place.
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