Which of the following is always true of a chemical change?
A new substance is formed.
In a chemical change, the original substances undergo a transformation that results in the formation of one or more new substances with different chemical properties. This fundamental aspect distinguishes chemical changes from physical changes, where the substance remains the same.
While color, shape, or texture changes can occur during a chemical change, these alterations are not definitive proof of a chemical change. Physical changes, such as melting or dissolving, can also lead to changes in these properties without forming new substances.
The mass of a closed system remains constant during a chemical change, according to the law of conservation of mass. Therefore, mass may not necessarily increase; it can remain the same or change due to the reaction's nature, but it does not serve as a universal indicator of a chemical change.
This statement is always true for a chemical change, as the defining characteristic of such a change is the production of new substances with distinct chemical identities. This transformation is what differentiates chemical changes from physical changes.
The production of gas or vapor can occur during a chemical change, but it is not a requirement. Many chemical reactions do not produce gas, and some physical changes can also result in gas formation. Thus, this statement does not universally apply to all chemical changes.
A defining feature of a chemical change is the formation of new substances, which occurs as a result of chemical reactions. While other observations, such as color change or gas production, can accompany these reactions, they do not universally apply to all chemical changes. The formation of new substances remains the only characteristic that is always true of chemical changes, ensuring a clear distinction between chemical and physical processes.
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