GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A change in which the atoms or molecules in a substance stay the same
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Matter
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Mixture
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Physical Change
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Chemical Change
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Explanation:
Detailed explanation-1: -Physical changes are reversible, the molecules of the substance remain exactly the same before and after the physical change.
Detailed explanation-2: -Physical changes involve moving molecules around, but not changing them. Some types of physical changes include: Changes of state (changes from a solid to a liquid or a gas and vice versa)
Detailed explanation-3: -No atoms are added or taken away from the system, so the mass stays the same. Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants.
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