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Questions and Answers
How are soil colloids observed?
How are soil colloids observed?
- Using a magnifying glass
- Using an ordinary light microscope
- Using an electron microscope (correct)
- Without any special equipment
What is the size of soil colloids?
What is the size of soil colloids?
- Less than 0.001 mm (correct)
- More than 2 micrometers
- Between 0.001 - 0.002 mm
- Between 1 - 2 micrometers
What is the total surface area of soil colloids?
What is the total surface area of soil colloids?
- More than 1000 m2/g
- Ranges from 10 m2/g to more than 800 m2/g (correct)
- Exactly 500 m2/g
- Less than 10 m2/g
What gives rise to an ionic double layer in soil colloids?
What gives rise to an ionic double layer in soil colloids?
What do soil colloids attract on their surfaces?
What do soil colloids attract on their surfaces?
Flashcards
Observing Soil Colloids
Observing Soil Colloids
Soil colloids are observed using an electron microscope due to their extremely small size.
Size of Soil Colloids
Size of Soil Colloids
Soil colloids are very tiny particles, measuring < 0.001 mm in size.
Surface Area of Soil Colloids
Surface Area of Soil Colloids
The total surface area of soil colloids ranges widely, from 10 m²/g to >800 m²/g.
Ionic Double Layer Formation
Ionic Double Layer Formation
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Attraction of Cations
Attraction of Cations
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Study Notes
Observing Soil Colloids
- Soil colloids are observed using techniques such as electron microscopy, centrifugation, and chromatography.
Characteristics of Soil Colloids
- The size of soil colloids ranges from 1-1000 nanometers (nm) in diameter.
Surface Area of Soil Colloids
- The total surface area of soil colloids is very large due to their small size.
Ionic Double Layer in Soil Colloids
- The ionic double layer in soil colloids is formed when the colloid surface reacts with ions in the surrounding solution, creating a layer of opposite charge.
Attraction on Soil Colloid Surfaces
- Soil colloids attract and hold ions, water, and organic compounds on their surfaces through electrostatic forces, hydrogen bonding, and van der Waals interactions.
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