is this correct statement
After undergoing a chemical reaction substances no longer exist in their original form? If not explain.
I think it is correct but then i think this might be the definition for a chemical change ( not reaction )
The staement is correct. A new chemical compound is formed in a chemical reaction, and all chemical and physical properties change
The statement you provided is not entirely correct. When a chemical reaction occurs, substances do not exist in their original form. However, they may still exist in a different form or in different combinations with other substances.
To explain this in more detail, let's first clarify the terms "chemical reaction" and "chemical change." A chemical reaction refers to the process of substances interacting with each other, resulting in the formation of new substances with different properties. On the other hand, a chemical change refers to any process that alters the chemical properties (composition) of a substance.
During a chemical reaction, the original substances, called reactants, are transformed into new substances, called products. These products can have different physical and chemical properties compared to the reactants. This means that the reactants no longer exist in their original form or identity.
For example, if you mix hydrogen gas (H2) with oxygen gas (O2) and ignite it, a chemical reaction called combustion occurs. The reactants (H2 and O2) combine to form water (H2O) as the product. In this case, the reactants (H2 and O2) no longer exist in their original form as they have transformed into water.
However, it's important to note that although the reactants are transformed into new substances, the individual atoms themselves are conserved. This is known as the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.
In summary, the statement is partially correct as substances do not exist in their original form after undergoing a chemical reaction. However, they can exist in different forms or combinations with other substances, and this transformation is referred to as a chemical change.