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List 4 observations that suggest a chemical change is occurring

User Sazz
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1. Creation of different compounds. (Since a chemical change is one in which the arrangement of atoms changes.)
2. Color change. ( Because if a new compound is formed, its color can be different from the original compound)
3. Cannot be reversed by reversing the condition.
4. In most cases, a gas is formed.
User Zachary Haber
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1. The evolution of energy
2. the production of a gas
3. the formation of a precipitate
4. color change
User Yunus Kulyyev
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