Explanation of how we can infer a chemical change has occurred.
Ammonia solution - Distilled water - Glass beaker - Universal indicator - Effervescent tablets.
1- Put a quantity of distilled water in the glass.
2- Add drops of ammonia solution into the water in the glass, and observe what happens.
3- Put drops of universal indicator into the solution and observe the color that forms.
4- Add an effervescent tablet to the solution and observe what happens.
We observe a colour change from blue to orange, and we notice the formation of foam from the effervescent tablet, indicating the presence of gas.
We can observe chemical changes through a change in color, the occurrence of a reaction or fizzing, or a change in temperature.
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