Determine whether each pair of compounds forms a homogeneous solution when combined. For those that form homogeneous solutions, indicate the type of forces that are involved. a. CCl₄ and H₂O b. KCl and H₂O c. Br₂ and CCl₄

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Identify the polarity of each compound: CCl₄ (carbon tetrachloride) is a nonpolar molecule because the individual bond dipoles cancel each other out. H₂O (water) is a polar molecule due to its bent molecular shape and the difference in electronegativity between hydrogen and oxygen.

Assess the solubility based on polarity: Nonpolar substances tend to dissolve well in nonpolar solvents, and polar substances tend to dissolve well in polar solvents. Since CCl₄ is nonpolar and H₂O is polar, they are likely not to form a homogeneous solution.

Consider the 'like dissolves like' principle: This principle states that substances with similar intermolecular forces are likely to be soluble in each other. CCl₄ and H₂O have different types of dominant intermolecular forces.

Identify the dominant intermolecular forces in each compound: CCl₄ primarily exhibits London dispersion forces, while H₂O exhibits hydrogen bonding, which is much stronger.

Conclude whether a homogeneous solution will form: Based on the differences in polarity and intermolecular forces, CCl₄ and H₂O are unlikely to form a homogeneous solution when combined.

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주요 개념

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Polarity

Polarity refers to the distribution of electrical charge over the atoms in a molecule. Polar molecules, like water (H2O), have a significant difference in electronegativity between their atoms, leading to a partial positive charge on one side and a partial negative charge on the other. In contrast, nonpolar molecules, such as carbon tetrachloride (CCl4), have an even distribution of charge. Understanding polarity is crucial for predicting solubility and the formation of homogeneous solutions.

Intermolecular Forces

Intermolecular forces are the forces of attraction or repulsion between neighboring particles (atoms, molecules, or ions). These forces include hydrogen bonding, dipole-dipole interactions, and London dispersion forces. The type and strength of these forces determine whether two substances will mix homogeneously. For example, polar substances tend to mix well due to dipole-dipole interactions, while nonpolar substances mix due to London dispersion forces.

Like Dissolves Like

The principle of 'like dissolves like' states that polar solvents tend to dissolve polar solutes, while nonpolar solvents dissolve nonpolar solutes. This concept is essential for predicting whether two compounds will form a homogeneous solution. In the case of CCl4 and H2O, the polar nature of water and the nonpolar nature of carbon tetrachloride means they will not form a homogeneous solution, as their intermolecular forces do not favor mixing.

Determine whether each pair of compounds forms a homogeneous solution when combined. For those that form homogeneous solutions, indicate the type of forces that are involved. a. CCl4 and H2O b. KCl and H2O c. Br2 and CCl4