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Question number 5 only question number 5 (five)
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Answer:
The four changes which tell that a chemical reaction has taken place are:
1. Color change
2. Evolution of gases
3. Change of state
4. Presence of precipitate
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Explanation:
1)Change in colour
2)Change in concentration
3)Increase or decrease in temperature
4)change in ph
these may help us to determine whether a chemical reaction have taken place or not
Hope it will help you.
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