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Which of the following would indicate that a new substance has been formed during a chemical reaction?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following is a sign that a chemical reaction has taken place?
A
Formation of a gas or precipitate
B
Melting of a solid
C
Change in the physical state without new substances forming
D
Dissolving sugar in water
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Understand that a chemical reaction involves the transformation of substances into new substances with different properties.
Recognize that physical changes, such as melting or dissolving, do not produce new substances; they only change the state or appearance of the material.
Identify that the formation of a gas or a precipitate (a solid that forms from a solution) indicates new substances are being created, which is a hallmark of a chemical reaction.
Recall that melting of a solid and dissolving sugar in water are physical changes because the chemical identity of the substances remains the same.
Conclude that the formation of a gas or precipitate is a clear sign that a chemical reaction has taken place.
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