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The document outlines a laboratory exercise for CHM 130LL: Molecular Models, focusing on the study of covalently bonded molecules. It includes instructions for drawing Lewis dot structures, constructing three-dimensional molecular models, and determining molecular shapes and polarity. The lab emphasizes the relationship between molecular structure and properties, particularly how polarity affects solubility and miscibility. Students will work in pairs to create models using specific color codes for different elements and apply concepts of electronegativity and bond polarity to predict the behavior of various molecules.

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What classifies a bond as polar?

A bond in which the electronegativity difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond. A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons, and so the sharing is unequal.

How can you tell if a bond is polar or nonpolar?

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.

What is difference between polar and nonpolar?

Polar molecules have a uniform distribution of electron density. A nonpolar molecule results from an unequal distribution of electron density. Polar compounds are arranged asymmetrically.

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What is required for a molecule to be polar?

To summarize, to be polar, a molecule must: Contain at least one polar covalent bond. Have a molecular structure such that the sum of the vectors of each bond dipole moment does not cancel.

What determines if a molecule is polar or nonpolar?

If the arrangement is symmetrical and the arrows are of equal length, the molecule is nonpolar. If the arrows are of different lengths, and if they do not balance each other, the molecule is polar. If the arrangement is asymmetrical, the molecule is polar.

What makes a bond polar or nonpolar?

Polar and non-polar refers to the level in which two elements equally share a pair of electrons. Individual bonds can be polar or nonpolar, as can entire molecules. Polar means there is unequal sharing of electrons, while nonpolar means equal sharing.

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