A substance's chemical structure depends on the number and types of atoms in each of its molecules, as well as on how those atoms are arranged. Substances with different chemical structures have different physical and chemical properties.
When a substance is a reactant in a chemical reaction, its chemical structure changes. During the reaction, the atoms that make up the reactants are rearranged to form products. After the reaction, the products together are composed of the same atoms as the reactants, but those atoms are arranged in a different way. So, the products have different chemical structures than the reactants.

The chemical reaction that produces soap is called saponification. During one type of saponification, oil and sodium hydroxide undergo a chemical change to produce glycerol and soap. As a result of this reaction, the soap has different properties than the oil and sodium hydroxide. Some of these properties are what give soap its cleaning ability.
Which of the following statements are true? Select all that apply.
Together, the products of a chemical reaction have the same arrangement of atoms as the reactants.
A chemical change occurs during saponification.
A substance's chemical structure affects its properties.
Soap is a reactant in the saponification reaction.