The simplest form of chemical matter that cannot be broken down without the loss of identity is a(n) _____.

• A. compound
• B. mixture
• C. element
• D. solution

Answer: (C)

Elements are the simplest form of chemical matter that cannot be broken down into simpler substances by chemical changes. They are composed of only one type of atom and keep their identity in reactions. A compound, in contrast, is made from two or more elements bonded together and can be decomposed into its constituent elements. A mixture is a blend of substances that retain their own identities and can be separated by physical methods. A solution is a homogeneous mixture where a solute is dissolved in a solvent. Because an element cannot be decomposed chemically into different substances while preserving its identity, it is the best fit for the description.