When a tortilla alone can run you 300 calories, and a dollop of sour cream about 115, staying under 1000 can be challenging (forget about adding chips and guacamole). The Times found that just 25 out of 1,200 burritos fell below 700 calories.
the hydrogen atom attracts electrons much more strongly than the oxygen atom. water has two hydrogen atoms covalently bonded to a single oxygen atom. the oxygen atom has a greater attraction for electrons than the hydrogen atom does. water dipole moment is equal to zero. the electrons of the covalent bond are not shared equally between the hydrogen and oxygen atoms.
You can think about it this way: Assume there is a center of mass of all the positive charges (nuclei) in a molecule, and a center of mass of all negative charges (electrons). If these two centers do not coincide, the molecule is polar. The measure of net molecular polarity is called dipole moment, ().