What indicates that a chemical reaction has occurred? [3 Mark]

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Solution

The factors which indicates a chemical reaction has occurred are as follows:[0.5 mark]
1. Change in color [0.5 Mark ]
2. Change in state [0.5 Mark ]
3. Energy transfer [0.5 Mark ]
4. Formation of precipitate [0.5 Mark ]
5. Change in state [0.5 Mark ]

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