Aparticular device uses electromagnetism by using electricity to move magnets. the magnets in this device are then used to do work. which device uses electromagnetism in this way?

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Why doesn't heat added to water make the tempature rise above 100c

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have