What is the minimum amount of heat required to completely melt 20.0 grams of ice af it's melting point

Can someone me with these questions plz.

What are transitions between a liquid and a solid called? identify which way they are transitioning

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.