SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are NOT signs that a chemical reaction occured?
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the properties changed
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bubbles of gas formed
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color stays the same
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smells different
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Explanation:
Detailed explanation-1: -The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties.
Detailed explanation-2: -Summary. Potential signs that chemical reactions have occurred include a change in color, change in temperature, formation of a gas, and formation of a precipitate.
Detailed explanation-3: -The correct answer is b) no net energy is involved.
Detailed explanation-4: -Color Change. Production of an odor. Change of Temperature. Evolution of a gas (formation of bubbles) Precipitate (formation of a solid) 02-Apr-2021
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