write two changes that can be observed during a chemical reaction?
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During a chemical reaction physical changes are observed. Explanation: such as emission or absorption of heat ,emission of light ,formation of precipitate,the evolution of gas and colour change occurs.
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Explanation:
The change of one type of matter into another type (or the inability to change) is a chemical property. Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion
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