Which of the following could result from a substance that undergoes a chemical change? A) Its elemental composition is altered. B) It undergoes phase change. C) It has a reversible change. D) Its shape is altered.
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Answer:
When substances undergo chemical change, the mass of the reactants will be the same as the mass of the products. Mass is converted when substances undergo chemical change but is not lost. Mass cannot be created or destroyed.
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A substance that undergoes a chemical change is (B) It undergoes phase change.
Explanation:
Its elemental composition is altered:
- The most important thing to remember is that the makeup of a substance does not change when it undergoes a physical change, but it does change when it undergoes a chemical change.
- Chemical Reactions are another name for chemical changes. Different compounds are combined in chemical reactions.
It undergoes phase change:
- Matter undergoes phase shifts such as sublimation, deposition, condensation, evaporation, freezing, and melting.
It has a reversible change:
- A reversible change is one that can be reversed or undone. A reversible reaction is one in which the substances used to start the reaction can be recovered.
- Dissolving, evaporation, melting, and freezing are examples of reversible reactions.
Its shape is altered.
- An object's shape can be modified while the object's chemical composition remains unchanged.
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