Answer:
An example of a type of reaction that involves the production of a new solid is a precipitation reaction. In a precipitation reaction, two aqueous solutions are mixed, and a solid substance called a precipitate is formed as a result of a chemical reaction between the ions in the solutions.
For instance, when a solution of silver nitrate (AgNO3) is mixed with a solution of sodium chloride (NaCl), a white solid called silver chloride (AgCl) is formed as a precipitate:
AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)
The formation of the silver chloride precipitate is evidence of a chemical change for several reasons:
1. New Substance: A new solid substance (AgCl) is formed that did not exist before the reaction. This indicates a chemical change, as the reactants (AgNO3 and NaCl) have transformed into a different product (AgCl).
2. Irreversibility: Precipitation reactions are typically irreversible, meaning it is challenging to separate the precipitate back into its original components. This further confirms that a chemical change has occurred.
3. Energy Changes: In some precipitation reactions, energy changes occur in the form of heat or light. This indicates that bonds are being broken and formed between the atoms, which is characteristic of a chemical change.
Overall, the production of a new solid (precipitate) in a reaction is strong evidence of a chemical change taking place.
Step-by-step explanation: