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.

Potassium iodide is the chemical compound widely used as dietary supplement and for medications. The reaction between KI and lead (II) nitrate is an endothermic reaction because:

Heat is absorbed
Precipitate forms
Color changes

Double displacement reaction is observed in the KI and lead nitrate because the exchange of ions between both the reactants takes place. It is also an example of the precipitation reaction because the precipitate of lead iodide is formed.

The signs observed in the chemical reaction are:

The reaction is an endothermic reaction because heat is absorbed in the reaction. The increase in temperature will result in the dissociation of lead iodide ions.
The reaction of the color changes as the colour of potassium iodide is white, whereas the color of lead nitrate is also white. The reaction between the two will result in the formation of yellow precipitate of lead iodide.

Therefore, the color changes, heat absorption, and formation of precipitate are the signs present in the given chemical reaction.

To know more about chemical reaction, refer to the following:

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