The reaction observed in this video is the precipitation of lead iodide from solutions of lead nitrate and potassium iodide. Pb(NO3)2(aq) + 2 KI (aq) → PbI2(s) + 2 KNO3(aq) Does this reaction conform to the law of conservation of matter?

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The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

The se-ci  bonds is more polar  than s-br bond