Why pbbr4 and pbi4 are unstable?

What wold be produced in a combustion reaction? Water reacts with sodium metal to produce sodium hydroxide and hydrogen along with heat and light.what are the reactants in this chemical reaction? How does the structure of chromosomes in prokaryotic cells and eukaryotic cells affect the DNA replication processes in a cell? What is the order of some plot points in 'The Management of Grief'? What removes the natural oil and shine from the nail plate? What is it called when a substance passes from the fluid in the tubular lumen through the apical membrane the across the cytosol into the interstitial fluid? Why are different kinds of models represent something like the solar system? What system of measurement is considered as more convenient to used? Are vinegar an orange juice weak acids? How can solutions be classified? Neurons that detect stimuli in the environment are known as? What time is it at 6 00am GMT in the eastern time zone? What is calibration How calibration of instruments is done? What is the southern most point of the earth axis? What are the sources that damage the ozone layer? Which city is located at 28N latitude and 82W longitude? What is anode sludge? Why do organic liquids have lower surface tension than water? How much uranium is left if a solid piece goes through? What measures how cold or hot something is?