Why is water considered a polar molecule?
2. Its electrons spend more time with its oxygen than with either hydrogen.
3. It remains liquid even at very low temperatures
4. The negatively charged oxygen atom attracts the positively charged hydrogen atoms.
5. Both hydrogens are at one end of the molecule and oxygen is at the other end.
Answer:
Ok, there is only one correct answer, 2. The electrons are assumed to be spending more time around oxygen, weakening and polarizing the bond. The negative charge concentrates on oxygen leaving the hydrogens positive.
4 is a result of being polar, not why it is considered polar. 3 is simply wrong, cold is relative, besides, a more polar molecule would solidify at a higher temperature (which is more like a solid, salt of oil?). 5 would not be a reason why H2O is polar, same with 1, in fact both statements are ambiguous at best, I would say they are wrong.
1,2, and 5
The oxygen molecule has a bent molecular geometry, so the oxygen atom can be isolated by itself away from the hydrogen atoms. Oxygen is more electronegative so it attracts the electrons and becomes negatively charged, while the hydrogen atoms become positively charged.
Here's a cool link with pictures and stuff:
http://en.wikipedia.org/wiki/h2o...
hi
i will explain u from the basics..
not wasting ure time...most appropriate is 4 option
the correct answer is 1,2,4,5
MOST APPROPRIATE IS 4.
HOW ??
i'll tell u that oxygen is much more electronegative than hydrogen. ....oxygen has an electronegativity value of 3. and hydrogen's is 2.2, so it's slightly polar. ....
The polarity comes from a difference in electronegativity between the Oxygen (high electronegativity) and the H (low electronegativity ).
It leads to a difference in partial charges: the O is slightly negative (-ve), while the H has a slight positive (+ve) charge.
in more detail....
---Oxygen is highly electrophilic (electron loving).
---This means that even though the oxygen in water is bound to each of the hydrogens by a covalent bond (sharing a pair of electrons), the oxygen "pulls" the shared electrons closer to itself.
---This unequal sharing of the electrons in the O-H bond in water causes the hydrogens to have a partial positive charge (positive dipole), and the oxygen has a partial negative charge (negative dipole).
Water is called a polar molecule because it has a positive side and a negative side, called a dipole moment.
to understand by structures..
go to links below....ive explained thru structures...~~!!
http://i180.photobucket.com/albums/x281/...
hope this is the best answer...
all the best...
yes, but only when the rotational/vibrational energy is less than is required to temporarily give it D(infinity)h symmetry.
The correct answer is 5.
Oxygen has two paired, un-bonded electrons at one end and two relatively positive Hydrogens at the other. Therefore the molecule is Polar.
Your 1,2,4,5 points above make the water molecule polar. H2O has a dipole between O-H and the H is slightly posiivite and O is slighlty negative. So, there are two charges on the molecule and that makes it polar. If you look at methane (CH4) for example, the molecule is non-polar because the charges cancel out.
----><----
H--C--H (the charges cancel out in both ways).
good luck.
"2" seems to be the best answer, chemically speaking
Polarity is traditionally thought of as an "uneven charge distribution". This results from an uneven distribution of electronic charge on a molecule. In water, the oxygen atom has a higher charge density than either of the two hydrogen atoms. This makes the oxygen atom "negative" and the hydrogens "positive". The net result is that each water molecule behaves like a tiny magnet and this gives water many unique properties such as its boiling point and the fact the solid is less dense then the liquid.
Well, i'll tell you: NONE. At least, none of the options are sufficient though they might be necessary, to explain water's polarity.
Water is a polar molecule, because of ALL of the following:
- Oxygen is more electronegative than hydrogen, hence attracting electrons to itself, inducing a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.
- The geometry of the water molecule (an 104.5 angle between the hydrogen atoms), impedes the partial charges created from cancelling themselves, thus giving the molecule a net dipole moment.
So, even if the asker intended you to choose option 2, it would be wrong to do so, since even if it is a necessary condition for water's polarity, it is not sufficient in itself.
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