An overall dipole moment is H2S.
There are many molecule with a dipole.
A very basic look at the Table of Electronegativities. . Those elements in a two atom molecule, with different electronegativities, will have a dipole.
The Table of Electronegativities is an arbitrary table, with Fluorine at '.-4' the most electronegative element.
Hydrogen is 2.20
So a substance such as HF has dipole.
Methane CH4 does not have a dipole because #1 the electronegativities are very close , and #2 there is a equal pull by the 4 x hydrogens on the central carbon.
Cyanamide has a high dipole ca 4 Debye. HCN is ca 3 Debye. Gaseous forms of halide salts e.g molecular KBr has a very high dipole moment of around 10 Debyye as it essentailly an ion pair . The previous version of this answer said CO2 had a dipole moment - as it is symmetric (linear molecule) its dipole moment is 0.
A dipole moment is the measure of a molecules polarity, which is equal to the magnitude of the charge at each end times the distance between them. CN has a dipole moment of 3.6.
NH3 and NH3
CH4 and CH4
CO2 and CH4
NH3 and CH4
CO2 and CO2
An ionic bond. The larger the difference in the electronegativities of the atoms, the larger/stronger the dipole moment.
Which of these molecules has an overall dipole mome
There are many - N2 does not but CO does.
H2S
When molecules have permanent dipole moments
Dipole-Dipole Forces of attraction
Hold polar molecules together
Symmetric molecules have no dipole moment. An example is carbon tetrachloride, CCl4 , which has no dipole moment yet the C-Cl bonds are polar, (chlorine is more electronegative than carbon). The chlorine atoms each have a small negative charge but because the molecule is tetrahedral there is no dipole and therefore no dipole moment
the permanent dipole of one molecule attracts the permanent dipole in a different polar molecules.
All polar molecules have a permanent dipole moment, but London dispersion forces in non-polar molecules can cause temporary dipole moments as well.
When molecules have permanent dipole moments
Dipole dipole interactions are between two polar molecules. As long as two molecules are polar, they form dipole dipole interactions.
Polar molecules which contain ionic or dipole to dipole forces binding their molecules in molten state.
The interactions between HCl molecules is a dipole-dipole interaction.
When molecules have permanent dipole moments
Dipole-Dipole forces
When molecules have permanent dipole moments
Hold Polar molecules together
Dipole-Dipole Forces of attraction
Hold polar molecules together
The correct answer is: When molecules have permanent dipole moments.