Molarity and Colligative Properties
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A property that depends on the number of solute particles (concentration) is said to be a colligative property. The pressure of a vapor in equilibrium with its liquid is referred to as vapor pressure. It is a measure of the tendency of the molecules of a liquid to escape into the gaseous phase. The boiling point of a liquid is the temperature at which its vapor pressure is equal to atmospheric pressure. When a solid is dissolved in a liquid, the vapor pressure of the liquid is decreased because the surface area from which molecules can evaporate is reduced.
| Word Bank | ||
|---|---|---|
| atmospheric pressure | colligative | decreased |
| equilibrium | gaseous |
Match the colligative property with its uses.
Freezing point depression
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Freezing point depression
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Responsible for antifreeze keeping water from freezing in a car’s cooling system.
Causes ice to melt on the street after salt has been spread on it.
Responsible for antifreeze keeping water from boiling over during the summer in a car’s cooling system.
Match the colligative property with its uses.
Boiling point elevation
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Boiling point elevation
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responsible for antifreeze keeping water from boiling over during the summer in car’s cooling system
responsible for antifreeze keeping water from freezing in a car’s cooling system
causes ice to melt on the street after salt has been spread on it