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When potassium iodide liquid is poured into lead nitrate solution (both clear solutions), a bright yellow solid, lead iodide, forms in a potassium nitrate solution. What are the signs that this is a chemical reaction? Check all that apply.


  • Heat is produced.
  • Light is produced.
  • Heat is absorbed.
  • Bubbles appear.
  • A precipitate forms.
  • The color changes.

Verified Answer :

Final answer:

When potassium iodide reacts with lead nitrate, signs of a chemical reaction include the formation of a precipitate and a change in color. Additional indicators may include heat production and gas bubbles. These observations confirm that a chemical change has occurred.


Explanation:

Chemical Reactions and Their Signs

In the experiment described, when potassium iodide is added to lead nitrate solution, several observable signs indicate that a chemical reaction is taking place. Here are the signs you should look for:

  • Heat is produced. This signifies an exothermic reaction where energy is released.
  • Heat is absorbed. This indicates an endothermic reaction where energy is taken in.
  • Bubbles appear. This often indicates the production of a gas.
  • A precipitate forms. In this case, the bright yellow solid lead iodide is the precipitate, which signifies a chemical reaction has occurred.
  • The color changes. The formation of the yellow solid from the clear solutions demonstrates a significant change in color, which is another indicator of a chemical reaction.

Based on these points, the signs that are applicable to your situation include: a precipitate forms and the color changes. In summary, these observations confirm that a chemical reaction has taken place when mixing potassium iodide and lead nitrate solutions.


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