The answer to this would be a physical change. Physical changes are changes that affect the form of a chemical substance, but not the chemical composition itself. Hope this helped!
Answer:
The correct answer is Choice C.
(Phenol red indicator.)
Explanation:
Phenol red indicator is an organic dye that acts as an acid-base reaction indicator in the pH range of 6.8 to 8.4.
In acidic solutions, the color is purple, and in simple solutions, the color is red.
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A national day is a day on which celebrations mark the nationhood of a nation or state. It may be the date of independence, of becoming a republic, or a significant date for a patron saint or a ruler (such as a birthday, accession, or removal). The national day is often a public holiday.
A mole is most similar to Avogadro's number -
6.02 x 10^23