How was Mendeleev able to predict the properties of gallium before it was discovered? Explain why water is classified as a pure substance even though it contains two different kinds of atoms (hydrogen and oxygen, H_2O). Briefly define chemistry. What is chemistry the study of?
How was Mendeleev able to predict the properties of gallium before it was discovered? How do you know which one is more polar between different carotenoids? In a TLC experiment, how to determine which R_f values for the spots are in the best solvent?
Whatever his thought process, Mendeleev ultimately arranged the elements according to both atomic weight and valence electrons. Not only did he leave space for elements not yet discovered, but he predicted the properties of five of these elements and their compounds. In March 1869, he presented th...
Because not all elements were then known, there were gaps in his periodic table, and Mendeleev successfully used the periodic law to predict properties of some of the missing elements. The periodic law was recognized as a fundamental discovery in the late 19th century, and it was explained ...
Why are Group 7A (17) elements found in many compounds but not Group 8A (18) elements? Explain why the formula HCl can represent two different chemical systems? How was Mendeleev able to predict the properties of gallium before it was discovered?
How was Mendeleev able to predict the properties of gallium before it was discovered? How do we know that substances such as sodium chloride consist of positively and negatively charged particles? Briefly explain how the conduction of electricity takes place in iron metal. ...