A 50-50 mix of antifreeze and water in the cooling system raises the boiling point.

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Multiple Choice

A 50-50 mix of antifreeze and water in the cooling system raises the boiling point.

Explanation:
When a nonvolatile solute is dissolved in a solvent, the boiling point rises. In a 50-50 mix, antifreeze (glycol) molecules dissolve in the water and lower the vapor pressure of the water. With lower vapor pressure, more heat is needed for the liquid to boil, so the mixture boils at a higher temperature than pure water. This helps keep the cooling system from boiling over in a hot engine. The mixture also lowers the freezing point, but that effect isn’t about boiling. It won’t change engine compression, which is a mechanical property of the engine, not the coolant.

When a nonvolatile solute is dissolved in a solvent, the boiling point rises. In a 50-50 mix, antifreeze (glycol) molecules dissolve in the water and lower the vapor pressure of the water. With lower vapor pressure, more heat is needed for the liquid to boil, so the mixture boils at a higher temperature than pure water. This helps keep the cooling system from boiling over in a hot engine. The mixture also lowers the freezing point, but that effect isn’t about boiling. It won’t change engine compression, which is a mechanical property of the engine, not the coolant.

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