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Questions and Answers
What is a solution in the context of chemistry?
What is a solution in the context of chemistry?
- A mixture of only solute and solvent
- A mixture of two or more components (correct)
- A homogeneous mixture of only solute
- A mixture of only two components
What is the solvent in a solution?
What is the solvent in a solution?
- The substance being dissolved
- The component with the highest concentration
- The substance with the highest molecular weight
- The dissolving medium (correct)
What is a characteristic of a heterogeneous mixture?
What is a characteristic of a heterogeneous mixture?
- The smallest samples are everywhere identical in composition and properties
- The mixture is always a solution
- The mixture is always a colloid
- The mixture is not uniform throughout (correct)
What is the term for the amount of solute that can be dissolved in a solvent at a given temperature?
What is the term for the amount of solute that can be dissolved in a solvent at a given temperature?
What is an example of a factor that affects solubility?
What is an example of a factor that affects solubility?
What is the term for a solution that contains more solute than the maximum amount that can be dissolved in the solvent?
What is the term for a solution that contains more solute than the maximum amount that can be dissolved in the solvent?
What is the difference between a saturated and an unsaturated solution?
What is the difference between a saturated and an unsaturated solution?
What is the result of increasing the temperature of a solution?
What is the result of increasing the temperature of a solution?
What is the term used to describe a colloid where the dispersed phase has little or no affinity for the dispersion medium?
What is the term used to describe a colloid where the dispersed phase has little or no affinity for the dispersion medium?
What is the primary reason why lyophobic colloids are difficult to prepare?
What is the primary reason why lyophobic colloids are difficult to prepare?
Which of the following is an example of a lyophobic colloid?
Which of the following is an example of a lyophobic colloid?
What is the primary application of colloids in the food and beverage industry?
What is the primary application of colloids in the food and beverage industry?
What is the characteristic of particles in a suspension?
What is the characteristic of particles in a suspension?
What is the property of a suspension that allows it to be separated by filtration?
What is the property of a suspension that allows it to be separated by filtration?
What is an example of a suspension?
What is an example of a suspension?
What is the term used to describe the settling of particles in a suspension?
What is the term used to describe the settling of particles in a suspension?
What is the process of creating a supersaturated solution?
What is the process of creating a supersaturated solution?
What is the term for the substance that is dispersed in a colloidal solution?
What is the term for the substance that is dispersed in a colloidal solution?
What is the size range of particles in a colloidal solution?
What is the size range of particles in a colloidal solution?
What is the characteristic of colloidal particles that prevents them from settling down due to gravity?
What is the characteristic of colloidal particles that prevents them from settling down due to gravity?
What is the term for the phenomenon where a strong beam of light is focused on a colloidal solution and the path of the beam becomes visible?
What is the term for the phenomenon where a strong beam of light is focused on a colloidal solution and the path of the beam becomes visible?
What is the term for colloids that have an affinity for the dispersion medium?
What is the term for colloids that have an affinity for the dispersion medium?
What is the characteristic of lyophilic colloids that makes them difficult to coagulate?
What is the characteristic of lyophilic colloids that makes them difficult to coagulate?
What is the method by which colloidal particles can be separated from their dispersion medium?
What is the method by which colloidal particles can be separated from their dispersion medium?
Study Notes
Solutions and Colloidal Systems
- Fluids in living systems are complex mixtures of colloids, ions, and molecules.
- A solution is a mixture of two or more components:
- Solute: the substance being dissolved
- Solvent: the dissolving medium
- Solutions are homogeneous mixtures, meaning the smallest samples are identical in composition and properties.
Factors Affecting Solubility
- Temperature
- Pressure
- Type of bond and forces between particles (intermolecular forces)
Types of Solutions
- Unsaturated solution: a solution in which a solvent can dissolve more solute at a given temperature
- Saturated solution: a solution in which no more solute can be dissolved at a given temperature
- Supersaturated solution: a solution that contains more solute than the maximum amount that can be dissolved at a given temperature, typically created by saturating a solution at a higher temperature and then cooling it to a lower temperature
Colloids and Colloidal Dispersions
- Colloids are mixtures of two or more substances where one substance is dispersed within another
- Dispersed phase: the substance dispersed within another
- Dispersion medium: the medium in which the substance is dispersed
- Colloidal particles range in size from 1 nanometer to 1 micrometer and can be solid, liquid, or gas
Properties of Colloids
- Heterogeneous mixture
- Small particle size
- Shows the Tyndall effect
- Does not settle down when left undisturbed
- Cannot be separated by filtration
- Can be separated by centrifugation
Types of Colloids
- Lyophilic colloids: dispersed phase has an affinity for the dispersion medium, examples include starch, rubber, and protein
- Lyophobic colloids: dispersed phase has little or no affinity for the dispersion medium, examples include solutions of metals like silver and gold
Applications of Colloids
- Thickening agents in industrial products
- Paints and inks
- Food and beverage industry
- Nanotechnology applications
- Dentistry, including dental materials and drug delivery systems
Suspensions
- A suspension is a heterogeneous mixture containing solid particles with a diameter greater than 1000 nm
- Particles are visible to the naked eye
- Examples include muddy water
Properties of Suspensions
- Heterogeneous mixture
- Large particle size
- Particles can be seen easily
- Particles do not pass through a filter paper
- Can be separated by filtration
- Unstable, particles settle down after some time
- Scatters a beam of light passing through it due to large particle size
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Description
Learn about the behavior of complex fluids in living systems, including colloids, ions, and molecules, and their vital role in the body. This medical chemistry quiz covers solutions and colloidal systems.
