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MED109 Chemistry Lecture 7: Colligative Properties

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MED109 Chemistry Lecture 7: Colligative Properties

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Questions and Answers

What is the main characteristic of colligative properties of solutions?

They only apply to solutions with volatile solutes

They are affected by the isotonic coefficient

They depend only on the amount and nature of the solvent (correct)

They depend on the chemical identity of the solute particles

According to Raoult's Law, what is the relationship between the partial vapor pressure of a solvent above a solution and the vapor pressure of the pure solvent?

Psolution = P0 / Xsolvent

Psolution = Xsolute P0

Psolution = P0 - Xsolute

Psolution = Xsolvent P0 (correct)

What is the effect of adding non-volatile solute particles to a solvent on the vapor pressure?

It decreases the vapor pressure (correct)

It causes the vapor pressure to remain constant

It has no effect on the vapor pressure

It increases the vapor pressure

What is the boiling point elevation (ΔTb) directly proportional to?

The molal concentration of the solute Signup and view all the answers

What is the relationship between the freezing point depression (ΔTf) and the molal concentration of the solute?

ΔTf is directly proportional to the molal concentration Signup and view all the answers

What is the main difference between non-electrolyte, strong electrolyte, and weak electrolyte solutions?

The nature of the solute particles Signup and view all the answers

What is osmosis?

The transport of solvent molecules from a higher concentration to a lower concentration Signup and view all the answers

What is the relationship between osmotic pressure and the ideal gas law?

There is no relationship between osmotic pressure and the ideal gas law Signup and view all the answers

What is an example of a colligative property?

Vapor pressure lowering Signup and view all the answers

Why do solute particles interfere with the escaping tendency of solvent molecules?

Because solute particles are non-volatile Signup and view all the answers