Covalent Bond Chemistry question ??? need help!!?

which of the following statements correctly describes the difference between a polar covalent bond and a nonpolar covalent bond...

- a polar covalent bond occurs when atoms share electron pair but one electron is left unpaired. a nonpolar covalent bond occurs when all the electrons are shared

- a polar covalent bond occurs from unequal sharing of electrons, whereas a nonpolar covalent bond occurs during equal sharing events

- a polar covalent bond occurs between ions, whereas a nonpolar covalent bond occurs between atoms

- a polar covalent bond occurs when an electron is transferred between two atoms, whereas a nonpolar bond occurs with the transfer of a proton

2 Answers

  • 9 years ago
    Favorite Answer

    The answer is the second one.

    Even if you don't know the answer off by heart, you can work it out by process of elimination. The first is wrong because a covalent bond always involves two electrons, you can't just leave one 'unpaired'.

    The third one doesn't work, because when two ions bond it is called "ionic bonding"*.

    The fourth one is clearly ridiculous, protons are not involved in bonding, they are one of the particles that make up the atom's nucleus.

    A polarised covalent bond means that the orbital, or the bubble that the electrons are whizzing around in, is shifted more towards one of the atoms than the other

    *(you will later discover that ionic bonds are actually just very very polarised covalent bonds. The third answer is still completely wrong though. A polarised covalent bond is caused because the two atoms have different "electronegativities", which mean they attract electrons with a different strength. The only time a covalent bond is truly non-polar is when the two atoms are the same, eg O2 or N2)

    Source(s): education in chemistry
  • Andrew
    Lv 4
    9 years ago

    Statement #2 is correct

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