Merits and demerits of Mendeleev's periodic table in points and explain each of them in short.(write in the easiest way you can and don't copy)​

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Give one example of a pure (exact) number and of an estimated (measured) number.