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 correct answer is "They prevent the atoms from forming a linear molecule. "

The lone pair of electrons on the O atom of the H₂O molecule repels the bond pair of electrons in the O-H bond. Thus causing H₂O to acquire a bent structure instead of a liner structure. If H₂O were a linear molecule the dipole of the each O-H bond would cancel out each other. However, in a bent structure each O-H bond contributes to the overall dipole of the H₂O molecule. Thus contributing to the polarity of a water molecule.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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