Problemas
Which statement about van der Waals forces is true? When the forces are weaker, a substance will have higher volatility. When the forces are stronger, a substance will have lower viscosity When the forces are weaker, the boiling point of a substance will be higher. When the forces are stronger, the melting point of a substance will be lower.
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Eugenia
avanzado · Tutor durante 1 años
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Respuesta
The correct statement about van der Waals forces is: When the forces are weaker, a substance will have higher volatility.Van der Waals forces are the weak intermolecular forces that exist between molecules. These forces include London dispersion forces, dipole-dipole interactions, and hydrogen bonding. The strength of van der Waals forces affects the physical properties of a substance, such as volatility, viscosity, boiling point, and melting point.Volatility refers to the tendency of a substance to vaporize or evaporate. When the van der Waals forces between molecules are weaker, the molecules are more easily separated, leading to higher volatility. Therefore, the statement "When the forces are weaker, a substance will have higher volatility" is true.The other statements are not accurate:- When the forces are stronger, a substance will have lower viscosity: This is not necessarily true. Stronger van der Waals forces can lead to higher viscosity, as the molecules are more strongly attracted to each other and less likely to flow.- When the forces are weaker, the boiling point of a substance will be higher: This is not true. Weaker van der Waals forces result in a lower boiling point, as the molecules are more easily separated during boiling.- When the forces are stronger, the melting point of a substance will be lower: This is not true. Stronger van der Waals forces generally lead to a higher melting point, as the molecules are more strongly attracted to each other and require more energy to overcome the intermolecular forces during melting.