Polar and Non-Polar Molecules

This video tutorial explains how to distinguish between polar and non-polar molecules. It covers the characteristics of non-polar molecules, such as being composed of one element, containing only carbon and hydrogen, or having symmetry. The role of electronegativity in determining polarity is discussed, with examples provided. The video also outlines how to identify polar molecules, focusing on hydrogen bonding and lack of symmetry. Various examples are used to illustrate these concepts, helping students understand the differences between polar and non-polar molecules.

What is the first category of non-polar molecules mentioned in the video?

• Molecules with hydrogen bonding

• Molecules made up of one element

• Molecules with asymmetry

• Molecules with high electronegativity difference

Which of the following is a non-polar molecule made up of only carbon and hydrogen?

• Hydrogen fluoride (HF)

• Ammonia (NH3)

• Methane (CH4)

• Water (H2O)

What characteristic makes carbon tetrafluoride (CF4) a non-polar molecule?

• Symmetry of the molecule

• Asymmetry of the molecule

• High electronegativity difference

• Presence of hydrogen bonding

If the electronegativity difference (EN difference) is less than 0.5, the molecule is generally:

• Ionic

• Non-polar

• Polar

• Metallic

Which of the following molecules is non-polar due to a small EN difference?

• Iodine monobromide (IBr)

• Methanol (CH3OH)

• Water (H2O)

• Ammonia (NH3)

What type of bonding makes a molecule polar?

• Metallic bonding

• Hydrogen bonding

• Van der Waals forces

• Ionic bonding

Which of the following molecules is polar due to hydrogen bonding?

• Methane (CH4)

• Carbon dioxide (CO2)

• Oxygen (O2)

• Ammonia (NH3)

Why is sulfur dioxide (SO2) a polar molecule?

• It has a bent shape

• It has a linear shape

• It has non-polar bonds

• It has symmetrical dipole moments

Which of the following molecules is polar due to its geometry?

• Carbon dioxide (CO2)

• Sulfur hexafluoride (SF6)

• Ammonia (NH3)

• Methane (CH4)

What is a common characteristic of non-polar molecules?

• Asymmetry with different outer elements

• Symmetry with identical outer elements

• High electronegativity difference

• Presence of hydrogen bonding