Is the reaction with potassium iodide solution and lead (ll) nitrate solution a physical or chemical change

a. physical change

b. chemical change

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.