SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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rapid release of energy (heat, light, or sound)
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phase change
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formation of bubbles
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formation of a precipitate from solution
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Detailed explanation-1: -Color. The changing of color of a substance is not necessarily an indicator of a chemical change.
Detailed explanation-2: -Four possible clues to chemical change include a transfer of energy, a change in color, the production of a gas, or the formation of a precipitate.
Detailed explanation-3: -phase change-a special type of physical change in which a substance transitions among the states of matter, solid, liquid, and gas, but the chemical properties of the substance remain the same.
Detailed explanation-4: -Melting of candle wax on heating is an example of physical change no chemical reaction is taking place only the change of state from solid to liquid state.
Detailed explanation-5: -Explanation: precipitate is the substance which didnot mix with any solution and also it didnot contribute for chemical reaction . therefore precipitate is not a condition for chemical reaction .