SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The only sure evidence for a chemical reaction is:
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the formation of a gas
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the production of one or more new substances
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a color change
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changes in properties
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Explanation:
Detailed explanation-1: -Chemical reactions can be identified via a wide range of different observable factors including change in color, energy change (temperature change or light produced), gas production, something burning, and the formation of a precipitate.
Detailed explanation-2: -The formation of a precipitate may be one of the most common signs of a chemical reaction taking place. A precipitate is defined to be a solid that forms inside of a solution or another solid.
Detailed explanation-3: -1. Combination Reaction. A reaction in which two or more reactants combine to form a single product is known as a combination reaction. Combination reaction is also known as a synthesis reaction.
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