In a study on chemical bonds, Ünal et al. (2002)
identified several misconceptions. Students assumed
that: (a) the hydrogens in ammonia were at equal
distance to each other and the bond angles were 120o
,
(b) the geometry of the water molecule was linear, (c)
carbondioxide molecule was polar, (d) there could not be
a hydrogen bond betwen a hydrogen and a sulfur atom,
(e) the chemical bond in hydrogen chloride was an ionic
bond or a hydrogen bond, (f) bond length and bond
angles would increase since molecules move apart from
each other with increasing temperature.