SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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production of gas
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phase change
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color change
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production of odor
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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: -But mass is a quantity that does not change during a chemical reaction.
Detailed explanation-3: -But it’s important to know that chemical changes have nothing to do with the phase of the substance – whether it is solid, liquid, gas or aqueous. The phase can affect how reactive a substance is, but changing phase (a physical change) is not the same as changing the substance (a chemical change).
Detailed explanation-4: -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-5: -Color Change. Production of an odor. Change of Temperature. Evolution of a gas (formation of bubbles) Precipitate (formation of a solid) 02-Apr-2021