What term describes a process where one substance combines with another substance?

• A. Absorption
• B. Adsorption
• C. Neutralization
• D. Decomposition

Answer: (A)

The correct term for the process where one substance combines with another substance is often described by the term "Neutralization." Neutralization typically involves an acid reacting with a base to produce water and a salt, signifying a combination of substances to form new products.

In chemistry, absorption refers to the process in which one substance is taken up into the volume of another, such as a sponge soaking up water. This does not necessarily imply a chemical reaction or combination at a molecular level.

Adsorption occurs when molecules adhere to the surface of a solid or liquid without penetrating it, which is again not indicative of a combination process in the chemical sense.

Decomposition, on the other hand, is a process where one compound breaks down into simpler substances, which is the opposite of combining.

Thus, "Neutralization" accurately describes the intended process of combination, while the other terms involve different actions and definitions in chemistry.