A chemical change:

A chemical change:

• A. A change that reverses color
• B. A change that results in the formation of new chemical substances.
• C. A change that is always reversible
• D. A change that only occurs at high temperature

Answer: (B)

A chemical change is defined by the making or breaking of chemical bonds to form substances with new chemical identities. In a chemical change, the starting materials are transformed into products that have different compositions and properties, such as new odors, colors, gases, or precipitates, and often accompanied by energy changes. That’s why the statement describing a change that results in the formation of new chemical substances is the best fit. It captures the essence that a chemical change creates substances different from what you started with. Keep in mind that reversibility, color changes, or temperature alone aren’t universal indicators. Some chemical changes are reversible, some physical changes involve color changes, and many physical changes don’t produce new substances at all (like melting ice). The key distinction is the formation of new chemical substances.

A chemical change is defined by the making or breaking of chemical bonds to form substances with new chemical identities. In a chemical change, the starting materials are transformed into products that have different compositions and properties, such as new odors, colors, gases, or precipitates, and often accompanied by energy changes.

That’s why the statement describing a change that results in the formation of new chemical substances is the best fit. It captures the essence that a chemical change creates substances different from what you started with.

Keep in mind that reversibility, color changes, or temperature alone aren’t universal indicators. Some chemical changes are reversible, some physical changes involve color changes, and many physical changes don’t produce new substances at all (like melting ice). The key distinction is the formation of new chemical substances.