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Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.
You might observe a change in color, gas bubbles being formed, a change in temperature (this might require the use of a thermometer, unless the solution actually boils), or you can test for a specific chemical by using an indicator, or analyse the solution by means of a mass spectrometer. Explosions are also a very convincing form of evidence that a chemical change has taken place.
A chemical change has taken place
The change in color indicates that a chemical reaction has taken place.
It is a chemical change. Through corrosion, a chemical reaction has taken place.
Physical change.
Fracture formation
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Chemical change. The formation of a precipitate is one indication that a chemical reaction has taken place.
Physical. It is a mixture of salt and water. No chemical change has taken place.
No. If you evaporate the water, the drink powder is left behind. No chemical change has taken place.
True