In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. when the water is exposed to air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. what makes this process a chemical change? a new substance is formed in this process, which is an important clue to chemical change. a change in state is observed in this process, which is an important clue to chemical change. this process involves separation of dissolved substances, which is an an important clue to chemical change. this process involves dissolving substances together, which is an an important clue to chemical change. this process involves breaking and reshaping of substances, which is an an important clue to chemical change. nextreset

The correct answer is a new substance is formed in this process, which is an important clue to chemical change.

Explanation:

Chemical change is defined as the process in which change in composition takes place. A new substance gets formed in this process. For Example: Formation of water molecule from hydrogen and oxygen gas.

A physical change is defined as the process in which change in shape, size and color takes place. No change in composition takes place as no new substance is getting formed. For Example: Melting of ice

We are given:

Sodium carbonate is being formed from sodium bicarbonate. The reaction for this follows:

As, new substance which is sodium carbonate is getting formed. Thus, it is a chemical change.

Hence, the correct answer is a new substance is formed in this process, which is an important clue to chemical change.

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