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What is a system in the context of physical pharmacy?
What is a system in the context of physical pharmacy?
A bounded space or an exact quantity of material.
Which of these best describes a true solution?
Which of these best describes a true solution?
True solutions are also referred to as molecular dispersions.
True solutions are also referred to as molecular dispersions.
True
What is the particle size range for true solutions?
What is the particle size range for true solutions?
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A mixture composed of two substances is known as a __________.
A mixture composed of two substances is known as a __________.
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Which of the following properties depend mainly on the number of particles in a solution?
Which of the following properties depend mainly on the number of particles in a solution?
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Study Notes
Definition of Terms
- A system is a confined space or a specific amount of material.
- A dispersion involves at least two phases, with one or more dispersed (internal) phases within a single continuous (external) phase.
- A phase is a distinct, homogeneous portion of a system, separated from other parts by definite boundaries.
True Solutions
- Also known as molecular dispersions.
- Composed of two substances, forming a binary solution.
- Components are referred to as the solvent and solute.
- One-phase system with small particle size.
- Particle size is less than 1 nanometer.
- Example: Salt dissolved in water.
Physical Properties of Substances
- Classified according to their dependence on the number of particles in a solution.
- Colligative properties depend on the number of particles.
- Examples of Colligative properties include:
- Osmotic pressure
- Vapor pressure lowering
- Boiling point elevation
- Freezing point depression
- Isotonic solutions have the same osmotic pressure as body fluids.
- A 0.9% sodium chloride solution is isotonic to body fluids.
- Solutions with higher osmotic pressure than tissues are hypertonic.
- Biological membranes may not always be permeable to all solutes, leading to differences between isotonic and isosmotic solutions.
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Description
Test your understanding of key concepts in physical chemistry, including systems, phases, and true solutions. Explore important properties like colligative properties and examples that illustrate these principles. This quiz will help reinforce your knowledge of the behavior of substances in solutions.
