Answer: Unequal bombardment of colloidal particles by molecules of the dispersion medium.
- A Gravity steadily pulling the colloidal particles downward through the medium
- B Unequal bombardment of colloidal particles by molecules of the dispersion medium
- C Strong covalent bonds forming and breaking between adjacent colloidal particles
- D A gradual loss of surface charge on the colloidal particles over time
Correct answer: B. Unequal bombardment of colloidal particles by molecules of the dispersion medium
Explanation: Brownian motion arises from continuous, random collisions of dispersion medium molecules with colloidal particles, keeping them in constant zig-zag motion.
A typical adsorption isotherm: x/m (mass adsorbed per gram of adsorbent) rises steeply at low pressure, then flattens into a saturation plateau as the adsorbent surface fills up.
Concept context
Explore the chemistry that happens at interfaces, from catalysts that speed up industrial reactions to colloids like milk, smoke, and gels that surround us every day.