What is the primary reason for the increase in viscosity of a liquid with molecu

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Question: What is the primary reason for the increase in viscosity of a liquid with molecular weight?

Options:

Correct Answer: Increased intermolecular forces

Solution:

Higher molecular weight leads to increased intermolecular forces, resulting in higher viscosity.

What is the primary reason for the increase in viscosity of a liquid with molecular weight?

What is the primary reason for the increase in viscosity of a liquid with molecular weight?

Step 1: Understand what viscosity means. Viscosity is a measure of how thick or sticky a liquid is.
Step 2: Know that molecular weight refers to the mass of the molecules in a liquid.
Step 3: Realize that as molecular weight increases, the size of the molecules also increases.
Step 4: Larger molecules can create stronger intermolecular forces, which are the attractions between molecules.
Step 5: Stronger intermolecular forces make it harder for the molecules to move past each other.
Step 6: When molecules have a harder time moving, the liquid becomes thicker or more viscous.
Step 7: Therefore, higher molecular weight leads to increased viscosity due to these stronger intermolecular forces.

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