When Kl and Pb (NO3)2 is combined, is this a chemical or physical change?
you get a precipate (PbI2). Getting a precipate indicates a chem reaction.
To determine if the combination of Kl and Pb(NO3)2 is a chemical or physical change, we need to understand the difference between these two types of changes.
A physical change refers to a change in the physical properties of a substance, such as its shape, size, or state of matter, without altering its chemical composition. Examples of physical changes include melting, boiling, dissolving, or breaking a substance into smaller pieces.
On the other hand, a chemical change (also known as a chemical reaction) involves the rearrangement of atoms or molecules to form new substances with different chemical properties. Chemical changes result in the formation or breaking of chemical bonds, leading to a change in the composition of the substances involved.
Now, let's analyze the combination of Kl (potassium iodide) and Pb(NO3)2 (lead(II) nitrate):
When Kl and Pb(NO3)2 are mixed together, a chemical change occurs. This is because the reaction between potassium iodide and lead(II) nitrate leads to the formation of new substances (products) with different chemical properties.
The balanced chemical equation for this reaction is:
2KI + Pb(NO3)2 -> 2KNO3 + PbI2
In this reaction, potassium iodide (KI) reacts with lead(II) nitrate (Pb(NO3)2) to form potassium nitrate (KNO3) and lead(II) iodide (PbI2).
Since the reaction involves the rearrangement of atoms and the formation of new compounds, it is considered a chemical change.
To conclude, when Kl and Pb(NO3)2 are combined, it results in a chemical change.