Which requires the removal of heat, melting or freezing?
is it evaporation? what is it? why?

Classify each statement about effective nuclear charge, zeff, as true or false.

Astudent made the lewis dot diagram of a compound shown. what is the error in the lewis dot diagram? a)an o atom should transfer all of its six electrons to mg because the formula is mgo b) both electrons of mg should be transferred to one o adam because the formula is mgo c) the electrons should be transferred from each o add him to capital mg because mg has fewer electrons d) the number of dots around mg should be four because it has to transfer two electrons to each o

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )