Ahome water softener has 75 000 cm3 of ion exchange resin with a capacity of 39 kg/m2 the occupants use 1800 l/day of water containing 0.24 mg/cm of hardness as caco3. if they want to soften the water to 78 mg/l as caco3, what percentage of water should bypass the unit? when will the unit need to be regenerated? (

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

Find the mass, in grams, of 5.00*10^23 molecules of f2

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.