chemistry

posted by .

Which compound is more polar: water or dicloromethane? I know that water is a polar molecule but I don't know the polarity of dicloromethane or how to figure out which one is more polar than the other?

  • chemistry -

    You can get a guess by comparing the electronegativities of the elements.
    For example, in H2O, H has EN of about 2.1 and O of about 3.5 for a difference of about 1.4. In dichloromethane, C is about 2.5 and Cl is about 3 for a difference of about 0.5. We might guess from this that water is more polar. This doesn't take into account the 3-D arrangement of the atoms nor the number of different atoms attached to the central atom (2 H to O in H2O and 2 Cl to C in CH2Cl2) but since both dichloromethane and water are essentially tetrahedral and both have the same number of atoms attached to the central atom (the H atoms to C in CH2Cl2 have little difference in EN) then we would stick with water. The only REAL test, I suppose, is to look up the dipole moment of the molecule. Those tables are not widespread and most don't have extensive listings. However, I found water and dichloromethane on the web; water is 1.85 Debye and CH2Cl2 is 1.4 so our best guess was right.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Can you please answer this question: Both water and carbon dioxide are triatomic molecules. Explain why one of these molecules is polar and the other is nonpolar?
  2. science(chem)

    A few questions. 1. What is the difference btwn crystalization and precipitation?
  3. CHEM

    Which statement best describes the polarity of SF_4Cl_2?
  4. CHEMISTRY

    Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 NH3 CO2 C3H8 H2O N2 My ans are: Polar Polar Polar Nonpolar polar Nonpolar are my answers correct?
  5. CHEMISTRY

    Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 NH3 CO2 C3H8 H2O N2 My ans are: Polar Polar Polar polar Nonpolar nonpolar polar Nonpolar are my answers correct?
  6. chemistry

    Determine if it is polar or non-polar molecule: C3H6O C2H5OH SiCl4 NH3 CO2 C3H8 H2O N2 My ans are: Polar Polar Polar polar Nonpolar nonpolar polar Nonpolar are my answers correct?
  7. Chemistry - molecular polarity

    Hi Dr. Bob. Could you please take a look at the question below and my work?
  8. biology

    polar molecule are soluble in water. how does this activity demonstrate polarity of molecule that contain the -OH group. our activity was to do an experiment mixing 2 diff liquids together to see if they dissolve and tell if its polar …
  9. Chemistry Honors

    If water, a polar molecule, is combined with another polar molecule, what can be said about the substance added to the water?
  10. Chemistry

    Which is more soluble in water? Briefly explain why. Acetic Acid: CH3CO(OH) OR Ethanol : CH3CH2OH I think its acetic acid because when observing its structure it is more polar than ethanol. And when using the like dissolves like rule,

More Similar Questions