Final answer:
Changes between atoms when substances undergo chemical reactions include the breaking and forming of chemical bonds, leading to new substances. Atoms may lose or gain electrons but retain their elemental identity.
Step-by-step explanation:
What kinds of changes occur between atoms when substances undergo chemical reactions? The correct answer is C) Bonds between atoms break and new bonds form. In a chemical change, which leads to a chemical reaction, new substances are formed by the breaking, forming, or rearrangement of chemical bonds between atoms. Atoms retain their identity in terms of the element to which they belong, but they can indeed lose or gain electrons, thereby forming electrically charged particles known as ions. However, the essential process of a chemical reaction involves the breaking of the old chemical bonds and formation of new ones, which sometimes includes the transfer and sharing of electrons among atoms.