Questions: In a lab, silver nitrate, AgNO3, is dissolved in water until no solid is observed in the container. Then, a solution of sodium chloride, NaCl , is added to the container. When you combine these aqueous solutions, there is no noticeable change in temperature; however, a solid precipitates and there is a slight change of color. Which statements about the lab experiment involving silver nitrate and a sodium chloride solution are true? - The color change of the solution indicates a chemical reaction occurred. - A chemical reaction did occur when the solutions were combined. - The lack of temperature change indicates a chemical reaction didn't occur. - The initial disappearance of silver nitrate in water indicates a chemical reaction occurred. - Formation of a solid indicates a chemical reaction occurred. - A chemical reaction occurred when silver nitrate was added to water.

Solution Steps

In the experiment, silver nitrate (\(\text{AgNO}_3\)) is dissolved in water, and then a solution of sodium chloride (\(\text{NaCl}\)) is added. The key observations are the formation of a solid precipitate and a slight color change, with no noticeable temperature change.

• Formation of a Solid Precipitate: This indicates a chemical reaction occurred, as the formation of a solid from two aqueous solutions is a classic sign of a precipitation reaction.
• Color Change: A change in color typically signifies a chemical reaction, as it suggests a change in the chemical composition of the solution.
• No Temperature Change: While temperature change can indicate a chemical reaction, its absence does not necessarily mean no reaction occurred. Some reactions are not exothermic or endothermic enough to cause a noticeable temperature change.

• The color change of the solution indicates a chemical reaction occurred.
  This is true, as color change is a sign of a chemical reaction.

• A chemical reaction did occur when the solutions were combined.
  This is true, as evidenced by the formation of a precipitate and color change.

• The lack of temperature change indicates a chemical reaction didn't occur.
  This is false, as a reaction can occur without a noticeable temperature change.

• The initial disappearance of silver nitrate in water indicates a chemical reaction occurred.
  This is false, as dissolving is a physical process, not a chemical reaction.

• Formation of a solid indicates a chemical reaction occurred.
  This is true, as the formation of a precipitate is a sign of a chemical reaction.

• A chemical reaction occurred when silver nitrate was added to water.
  This is false, as dissolving is a physical process.

Final Answer