Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. if no reaction occurs, write no reaction.
• sodium chloride and lead (ii)
• acetate potassium sulfate and strontium iodide chromium (iii)
• nitrate and sodium phosphate

2NaCl + Pb(C2H3O2))2 ==> 2NaC2H3O2 + PbCl2

K2SO4 + SrT2 ==> 2KI + SrSO4

Cr(NO3)3 + Na3PO4 ==> 3NaNO3 + CrPO4

Explanation:

PbCl2 is precipitated and is insoluble in the solution.

SrSO4 is precipitated and is insoluble in the solution.

CrPO4 is precipitated and is insoluble in the solution.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.