Which are polar or nonpolar?

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In summary, the question is asking which molecules, ClO_{4}^{-},H_{2}S,SF_{6}, and PCl_{3}, are polar or non-polar. All of the molecules have tetrahedral shapes except for SF_{6}, which is octahedral. The polarity of a molecule is determined by its electron configuration and the relative electronegativity values of its atoms. Not all molecular gases are polar, as demonstrated by hydrogen, chlorine, and methane. The shape of a molecule also plays a role in determining polarity. After analyzing the Lewis dot diagrams and electrostatic repulsion geometry, it is determined that PCl_{3} is the only molecule that does not have an all symmetric geometry.
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Homework Statement


The question asks which are polar or non-polar: [tex]ClO_{4}^{-},H_{2}S,SF_{6},PCl_{3}[/tex] ?

All molecules are tetrahedral and polar except for [tex]SF_{6}[/tex] which is octahedral and nonpolar.
 
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  • #2
It has something to do with the electron configuration. Like H-S-H, it is not linear. And the center of H is not the same as S. So you can analysize the electron configuration.Therefore you can determine whether it is polar or not.
 
  • #3
linuxux, you may wish to consider the relative electronegativity values of each atom that makes up the molecule.

As an aside, not all molecular gasses are polar; take hydrogen, chlorine, methane for example. Polarity depends not only on the electronegativity of each atom, but also the actual shape of the molecules themselves.
 
  • #4
i already did all the lewis dot diagrams, they all fit into the electrostatic repulsion geometry, the only one that didn't have an all symmetric geometry was [tex]PCl_{3}[/tex], unless i did something wrong, i haven't considered electro negativity yet however.
 
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  • #5
okay, is any of that right?...
 

1. What is the difference between polar and nonpolar molecules?

Polar molecules have an uneven distribution of charge, causing one end to be slightly positive and the other end to be slightly negative. Nonpolar molecules have an even distribution of charge and do not have a positive or negative end.

2. How do you determine if a molecule is polar or nonpolar?

A quick way to determine if a molecule is polar or nonpolar is to look at its chemical structure. If the molecule has a symmetrical shape and all of its atoms have similar electronegativities, it is most likely nonpolar. If the molecule has an asymmetrical shape and contains atoms with different electronegativities, it is likely polar.

3. Why is polarity important in chemistry?

Polarity is important in chemistry because it affects the physical and chemical properties of molecules. For example, polar molecules tend to have higher boiling and melting points, as well as being more soluble in polar solvents. Polarity also plays a role in how molecules interact with each other, influencing chemical reactions and bonding.

4. Can a molecule be partially polar?

Yes, a molecule can be partially polar. This means that the molecule has both polar and nonpolar regions due to differences in electronegativity between its atoms. This is common in molecules with multiple bonds or different types of atoms bonded together.

5. What are some examples of polar and nonpolar molecules?

Some examples of polar molecules include water, ammonia, and ethanol. Some examples of nonpolar molecules include carbon dioxide, methane, and oil. Keep in mind that most molecules have some degree of polarity, so it is important to consider the overall polarity of a molecule rather than categorizing it as strictly polar or nonpolar.

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