What is hard water and how does it form?

In which of these cases are the two wave points considered to be in phase with each other?

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

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.