A liquid substance was placed in a beaker and a solid powdery substance was added to it.
Which of the following observations will be the most reliable evidence to conclude that a chemical change has occurred?
a change in the colour of the solution.
a change in the volume of the solution.
a change in the temperature of the solution.
no evidence can be found as there will be no change
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Answer:
A change in temperature of the solution.
Explanation:
The rest can also happen for a physical change.
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