Boiling Point And External Pressure MDCAT Quiz: The boiling point of a liquid is the temperature at which its vapor pressure equals the surrounding external pressure on the liquid. This is a fundamental concept in physical chemistry and is important in understanding phase transitions, especially in the context of phase diagrams and colloidal solutions. The relationship between boiling point and external pressure is important for MDCAT students since questions regarding vapor pressure, phase changes, and colligative properties are very common.
Relationship Between Boiling Point and External Pressure
When a liquid is heated, its vapor pressure rises. With rising temperature, the vapor pressure of the liquid finally becomes equal to the outside pressure, and the liquid starts boiling. The temperature at which this happens is called the boiling point. When the outside pressure is lowered, like at higher altitudes, the boiling point of the liquid decreases. Water, for example, boils at 100°C at sea level but at a higher altitude where the atmospheric pressure is lower, water will boil at less than 100°C.
This relationship is described by the Clausius-Clapeyron equation, which relates the vapor pressure of a liquid to its temperature and can be used to calculate changes in the boiling point under different pressures.
Effect of External Pressure on Boiling Point
The boiling point of liquids is very much affected by external pressure. If the external pressure is decreased, the boiling point of the liquid also decreases. Hence, water boils at a lower temperature on a mountaintop than at sea level. The boiling point is directly related to the atmospheric pressure. The relation between these two physical quantities is very important for MDCAT students in solving questions on phase transitions and changes in pressure.
MDCAT Quiz on Boiling Point and External Pressure
The MCAT Quiz on boiling point and external pressure tests students’ understanding of how external pressure influences the boiling point of liquids and how boiling point elevation works in solutions. It could have questions based on calculating the boiling point at varied pressures, how pressure changes the boiling point at different altitudes, and also by applying concepts related to vapor pressure and colligative properties. This will help students be prepared for questions around phase change, vapor pressure, and boiling point in exams.
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Free Flashcard for Boiling Point and External Pressure
Our Free Flashcard for boiling point and external pressure gives a clear and concise review of the relationship between pressure and boiling point, along with equations for boiling point elevation. The flashcards also contain sample problems to enable students to do practice calculations involving K_b, molality, and changes in boiling point under varying conditions of pressure. Reviewing these flashcards, MDCAT students can reinforce their understanding of how external pressure affects the boiling point and be better prepared for the MDCAT exam.
The boiling point of a liquid is the temperature at which its vapor pressure equals __________.
Atmospheric pressure
As the external pressure increases, the boiling point of a liquid __________.
Increases
The boiling point of a liquid is lower at __________ altitudes due to lower atmospheric pressure.
High
The boiling point of water at sea level is __________ than at higher altitudes.
Higher
The relationship between boiling point and external pressure is __________.
Directly proportional
At high altitudes, water boils at a temperature __________ than at sea level.
Lower
When the external pressure is increased, the boiling point of a liquid __________.
Increases
The external pressure is __________ when you are on top of a mountain compared to sea level.
Lower
The boiling point of a liquid at a given external pressure can be calculated using __________.
Clausius-Clapeyron equation
Boiling point is influenced by the __________ of a liquid.
External pressure
At a fixed pressure, the boiling point of a liquid __________ with the addition of solutes.
Increases
The vapor pressure of a liquid must be __________ than the external pressure for boiling to occur.
Equal
When the atmospheric pressure decreases, the boiling point of a liquid __________.
Decreases
The boiling point of a liquid at 1 atm of pressure is called the __________.
Normal boiling point
The boiling point of water at 1 atm of pressure is __________ °C.
100
If you are in a pressurized environment, the boiling point of a liquid __________.
Increases
The boiling point of a liquid can be determined by measuring the __________.
Vapor pressure
A decrease in atmospheric pressure leads to a __________ boiling point for liquids.
Lower
The boiling point of a liquid is the temperature at which the liquid's vapor pressure equals the __________.
External pressure
The relationship between boiling point and external pressure is shown by the __________ curve.
Boiling point vs. pressure
When a liquid reaches its boiling point, it is in equilibrium between __________ and vapor.
Liquid
The boiling point of water at 1 atm of pressure is __________ °F.
212
The boiling point of a liquid is __________ when the external pressure is low.
Low
A liquid will boil at a temperature __________ than its normal boiling point if the external pressure is reduced.
Lower
The external pressure is lower at high altitudes, which causes the boiling point to __________.
Decrease
The boiling point of a liquid is a characteristic property that depends on the __________.
External pressure
The boiling point of a liquid at different altitudes can be predicted using __________.
Vapor pressure tables
Boiling point and external pressure are __________ proportional.
Directly
The boiling point of water at lower pressures (like in a vacuum) is __________ than at 1 atm.
Lower
A liquid will boil when its vapor pressure becomes __________ than the external pressure.
Greater
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