Select the correct answer.
Which of the following statements holds true for a chemical change?
O A.
In a chemical change, no new substance is formed.
О в.
In a chemical change, a substance changes its phase.
O c.
In a chemical change, the molecular structure of a substance changes.
O D.
In a chemical change, one substance dissolves into another.
C. In a chemical change, the molecular structure of a substance changes.
Explanation: 1. A chemical change involves the transformation of one or more substances into different substances with new chemical and physical properties. 2. During a chemical change, the molecular structure of the substances involved is altered. This means that the atoms rearrange to form new molecules with different properties than the original substances. 3. Examples of chemical changes include burning wood (where wood is converted into ash and gases), rusting of iron (where iron combines with oxygen to form iron oxide), and baking a cake (where ingredients combine to form a new substance with different properties).
Therefore, option C is the correct statement for a chemical change as it accurately describes the fundamental aspect of a chemical change, which involves a change in the molecular structure of a substance.
