Answer:-
A chemical change, also known as a chemical reaction, involves the transformation of one or more substances into different substances with altered properties.
Formation of Precipitate: When two solutions are mixed, and a solid (precipitate) forms, it's a sign of a chemical change.
Color Change: A noticeable change in the color of a substance can indicate a chemical reaction.
Production of Gas: The release of gas, often observed as bubbles or fizzing, during a reaction is another clue.
Heat or Temperature Change: Absorption or release of heat during a reaction can be a sign of a chemical change.
Formation of a New Substance: If the chemical composition of the substances involved changes, resulting in entirely new substances, it's a clear indication of a chemical change.
Examples of chemical changes include burning wood (producing ash and gases), rusting of iron (forming iron oxide), and baking a cake (where various ingredients combine and transform to produce a different texture and taste).
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