BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Polar molecules have at least three atoms.
|
|
|
Both atoms are exactly the same size.
|
|
|
The molecules contain no lone pairs.
|
|
|
The two atoms have the same electronegativity.
|
Detailed explanation-1: -The difference in electronegativity between two atoms determines how polar a bond will be. In a diatomic molecule with two identical atoms, there is no difference in electronegativity, so the bond is nonpolar or pure covalent.
Detailed explanation-2: -Covalent molecules made of only one type of atom, like hydrogen gas (H2), are nonpolar because the hydrogen atoms share their electrons equally.
Detailed explanation-3: -Whenever you see diatomic molecule of two identical atoms, such as nitrogen molecule (N2), chlorine molecule (Cl2), hydrogen molecule(H2), and so on, there is equal sharing of electrons between the atoms involved, therefore, they are a nonpolar.
Detailed explanation-4: -If the two atoms involved in the covalent bond are the same, they share the electron pair evenly between them. This forms a non-polar bond. A non-polar covalent bond is a bond in which the electron pair is shared equally between the two bonded atoms. One example is hydrogen gas, H2.
Detailed explanation-5: -Although there are no hard and fast rules, the general rule is if the difference in electronegativities is less than about 0.4, the bond is considered nonpolar; if the difference is greater than 0.4, the bond is considered polar.