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Jennifer and Cody are mixing substances during a lab experiment. They observe the four effects listed below. Which of these effects indicates that a chemical reaction has taken place between two substances?
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Jennifer and Cody are mixing substances during a lab experiment. They observe the four effects listed below. Which of these effects indicates that a chemical reaction has taken place between two substances?

User Aaron Wheeler
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General signs of chemical changes:

-unexpected change of color

-substance heats up or cools down

-gas is produced

-odor or smell is produced

User Hardik Barot
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