Why does the presence of lone pairs contribute to the polarity of a water molecule?
they allow the bonds between oxygen and hydrogen to be single.
they increase the partial positive charge on the oxygen atom.
they prevent the atoms from forming a linear molecule.
they counter the uneven pull on electrons between the atoms

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.