Podcast
Questions and Answers
Coarse suspensions have particles that are visible to the naked eye and settle ________.
Coarse suspensions have particles that are visible to the naked eye and settle ________.
quickly
Colloids are described as ________ because they consist of two or more phases.
Colloids are described as ________ because they consist of two or more phases.
heterogeneous
The ________ effect is the scattering of light by colloidal particles.
The ________ effect is the scattering of light by colloidal particles.
Tyndall
Colloidal particles exhibit random motion due to collisions with surrounding molecules, known as ________ motion.
Colloidal particles exhibit random motion due to collisions with surrounding molecules, known as ________ motion.
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Colloidal particles can have a ________ shape, such as spherical, irregular, or fibrous.
Colloidal particles can have a ________ shape, such as spherical, irregular, or fibrous.
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Colloidal particles have a high ________ area-to-volume ratio.
Colloidal particles have a high ________ area-to-volume ratio.
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What is the main difference between coarse suspensions and fine suspensions?
What is the main difference between coarse suspensions and fine suspensions?
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Which of the following properties is unique to colloids?
Which of the following properties is unique to colloids?
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What is the purpose of a centrifuge in relation to suspensions?
What is the purpose of a centrifuge in relation to suspensions?
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What is the effect of colloidal particles on the surface tension of a liquid?
What is the effect of colloidal particles on the surface tension of a liquid?
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Why are colloids stable?
Why are colloids stable?
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What is the term for the scattering of light by colloidal particles?
What is the term for the scattering of light by colloidal particles?
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Study Notes
Types of Suspensions
- Coarse suspensions: Particles are visible to the naked eye and settle quickly.
- Fine suspensions: Particles are smaller and take longer to settle.
- Deflocculated suspensions: Particles are highly dispersed and do not settle quickly.
Properties of Colloids
- Heterogeneous: Colloids consist of two or more phases (solid, liquid, or gas).
- Stable: Colloids do not settle or separate over time.
- Tyndall effect: Colloids scatter light, making them appear cloudy or opaque.
- Brownian motion: Colloidal particles exhibit random motion due to collisions with surrounding molecules.
Characteristics of Colloidal Particles
- Size: Colloidal particles range from 1-100 nm in diameter.
- Shape: Colloidal particles can be spherical, irregular, or fibrous.
- Surface area: Colloidal particles have a high surface area-to-volume ratio.
- Electrical charge: Colloidal particles can be positively or negatively charged, influencing their behavior and interactions.
Types of Suspensions
- Coarse suspensions have particles visible to the naked eye that settle quickly.
- Fine suspensions have smaller particles that take longer to settle.
- Deflocculated suspensions have highly dispersed particles that do not settle quickly.
Properties of Colloids
- Colloids are heterogeneous, consisting of two or more phases (solid, liquid, or gas).
- Colloids are stable and do not settle or separate over time.
- Colloids exhibit the Tyndall effect, scattering light and appearing cloudy or opaque.
- Colloids display Brownian motion, with particles moving randomly due to molecular collisions.
Characteristics of Colloidal Particles
- Colloidal particles range in diameter from 1-100 nm.
- Particles can be spherical, irregular, or fibrous in shape.
- Colloidal particles have a high surface area-to-volume ratio.
- Particles can carry an electrical charge, influencing behavior and interactions, with possible positive or negative charges.
Mixtures
Suspensions
- Coarse suspensions consist of large particles that settle quickly, often visible to the naked eye, such as sand in water or mud in water.
- Fine suspensions are composed of smaller particles that settle slowly, may require a centrifuge to separate, such as clay in water or flour in water.
Colloids
Properties
- Colloidal particles exhibit the Tyndall Effect, scattering light and making its path visible.
- Brownian Motion is a characteristic of colloidal particles, which exhibit random, zigzag motion due to collisions with surrounding fluid molecules.
- Colloidal particles often possess an electric charge, affecting their behavior and interactions.
- The stability of colloids is due to the balance of attractive and repulsive forces between particles.
- Colloids can exhibit unique optical properties, such as opacity or transparency, due to the size and distribution of particles.
- Colloids can affect the surface tension of a liquid, leading to changes in its behavior and properties.
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Description
Learn about the different types of suspensions, including coarse, fine, and deflocculated suspensions, as well as the properties of colloids, including heterogeneous mixtures, stability, and the Tyndall effect.
