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What is the primary reason why particles in a colloid do not settle out of solution?
What is the primary reason why particles in a colloid do not settle out of solution?
What happens when you stir an electrolyte into a colloid?
What happens when you stir an electrolyte into a colloid?
What is the term for a mixture of intermediate-sized particles that are between atomic-scale size of solution particles and the size of suspension particles?
What is the term for a mixture of intermediate-sized particles that are between atomic-scale size of solution particles and the size of suspension particles?
What is the effect of heating on a colloid?
What is the effect of heating on a colloid?
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What is the term for a colloid where liquid particles are dispersed in a liquid medium?
What is the term for a colloid where liquid particles are dispersed in a liquid medium?
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Study Notes
Particles and Mixtures
- Particles in a suspension are larger than atoms and can settle out of solution.
- Colloids are heterogeneous mixtures of intermediate-sized particles (between atomic-scale size of solution particles and suspension particles).
- Colloid particles are between 1 nm and 1000 nm in diameter and do not settle out.
Characteristics of Colloids
- The most abundant substance in a colloid is the dispersion medium.
- Colloids are categorized according to the phases of their dispersed particles and dispersing mediums.
- The dispersed particles in a colloid are prevented from settling out due to polar or charged atomic groups on their surfaces.
Electrostatic Layers in Colloids
- The polar or charged areas on the surface of dispersed particles attract the positively or negatively charged areas of the dispersing-medium particles.
- This results in the formation of electrostatic layers around the particles.
- The electrostatic layers repel each other when the dispersed particles collide, keeping the particles in the colloid.
Factors Affecting Colloids
- Interfering with the electrostatic layering can cause colloid particles to settle out of the mixture.
- Stirring an electrolyte into a colloid can cause the dispersed particles to clump together, destroying the colloid.
- Heating a colloid can destroy it by giving colliding particles enough kinetic energy to overcome the electrostatic forces and settle out.
Examples of Colloids
- Milk is a colloidal emulsion, with liquid particles dispersed in a liquid medium.
- Other types of colloids are categorized according to the phases of their dispersed particles and dispersing mediums.
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Description
This quiz covers the properties and characteristics of colloids and suspensions, including their particle sizes, settling behavior, and composition. It also includes examples of colloids, such as milk.
