What experiments could you do to help prove or disprove that two beakers contain the same compound?

Water can exist in three states solid liquid and? Was Jane Goodall British? How many electrons does magnesium have in its outermost electron as a result you would expect magnesium to form ions charge of? How is rapeseed pollinated? Why elements in the same family of periodic table have similar bonding properties? What was the importance of Mendeleevs periodic table to chemists? I am the nymph who nursed the infant Jupiter with goats milk what moon am i? What is one way new viruses are being monitored and controlled? What is the function of the flower stalk? Why does keeping iron dry prevent it from rusting? What steers or guides hurricane? Which term describes a chemical reaction in which is gained? What caused hurricane Katrina to go from catorgory 1 to category 5? What is the difference between rotation and rotation axis and equator? Is creatine a compound from amino acids? How was Copernicus' idea of planet movement different from ptolemy's? Where on the periodic table are cations located? Where did Jane Goodall work as a waitress? Are humans 5th order consumers in the Ocean food web? What are the main features that separate organisms into phylum sporozoa?