Chemistry 3 questions 30 points

question 1
what could cause the bond angles to differ between molecules?

the number of valence electrons transferred from the central atom
the number of lone pairs of electrons on the central atom
the size of the central atom in the bond
the bond angles wouldn’t differ because all bond angles are the same.

question 2
examine the molecules.

h2o
hcl
hf
what do all three molecules have in common?

all of the molecules contain an alkaline earth metal.
all of the molecules are polar covalent compounds.
all of the molecules are diatomic.
all of the molecules are nonpolar compounds.

question 3
if hydrogen (h) has an electronegativity of 2.20 and chlorine has an electronegativity of 3.16, what type of bond would hydrogen and chlorine form? why?

a nonpolar covalent bond because there is a difference in electronegativity of 0.96 between the atoms
electronegativity cannot be used to identify the type of bond that would occur between hydrogen and chlorine.
an ionic bond because there is a difference in electronegativity of 0.96 between the atoms
a polar covalent bond because there is a difference in electronegativity of 0.96 between the atoms