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.
When ionic substances are dissolved in water they do not exist as the pure substance (i.e. NaCl) but as dissociated ions (i.e. Na+ and Cl-). These ions respectively carry a positive and negative charge. Water (H2O) is a polar molecule meaning that it has a positive (on the hydrogen atoms) and negative (on the oxygen atom) dipole moment. When NaCl is dissolved in water, the Na+ ions attract the negative dipole moment of H2O and the Cl- ions attract the positive dipole moment of H2O.