Question
define chemical changes
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GPT-4o mini
Chemical changes refer to processes in which the molecular or atomic structure of a substance is altered, resulting in the formation of one or more new substances with different properties. These changes involve the breaking of existing chemical bonds and the formation of new bonds.
Key characteristics of chemical changes include:
1. **Formation of New Substances**: The original substance is transformed into different substances, which often have distinct physical and chemical properties.
2. **Energy Changes**: Chemical changes often involve energy changes, such as the release or absorption of heat (exothermic or endothermic reactions).
3. **Inability to Reverse**: Many chemical changes are not easily reversible, meaning the original substances cannot be recovered by simple physical means.
4. **Observable Signs**: Indicators of a chemical change may include color change, gas production (bubbles), formation of a precipitate (solid), or temperature change.
Examples of chemical changes include burning wood, rusting iron, mixing vinegar and baking soda, and digestion of food.
Key characteristics of chemical changes include:
1. **Formation of New Substances**: The original substance is transformed into different substances, which often have distinct physical and chemical properties.
2. **Energy Changes**: Chemical changes often involve energy changes, such as the release or absorption of heat (exothermic or endothermic reactions).
3. **Inability to Reverse**: Many chemical changes are not easily reversible, meaning the original substances cannot be recovered by simple physical means.
4. **Observable Signs**: Indicators of a chemical change may include color change, gas production (bubbles), formation of a precipitate (solid), or temperature change.
Examples of chemical changes include burning wood, rusting iron, mixing vinegar and baking soda, and digestion of food.