Thermal Motion of Molecules
Answers
Unit 37: Boltzmann’s Equation & Perrin’s Experiment
Q37.1) 3352
Q37.2) 0.107 kT
Q37.3) 1
Q37.4) 1.1 cm
Q37.5) 12 cm
Unit 38: Terminal Velocity, Sedimentation, & Centrifugation
Q38.1) 2.2 m/s
Q38.2) 0.245 kg/s
Q38.3) a) 5.45 μm/s
b) 1835 s
Unit 39: Diffusion & the Random Walk
Q39.1) a) 4 x 10⁻¹⁰ m²/s
b) 1.2 mm
Q39.2) 25 s
Q39.3) 37 ms
Q39.4) 0.028 m²/s
Unit 40: Fick’s Law
Q40.1) a) 5 x 10²⁰ ions/s/m²
b) 4.15 x 10⁻¹⁷ m²/s
Q40.2) B
Q40.3) 1.13 x 10⁻¹² mol/s
Unit 41: Osmosis & Osmotic Pressure
Q41.1) 1.0 Osmolar
Q41.2) 2.49 MPa
Q41.3)
@4°C: 0.086 osmoles/L and 0.086 osmoles/kg
@95°C: 0.081 osmoles/L and 0.085 osmoles/kg
Q41.4) a) no change
b) swell by 50%
c) shrink by 33.3%
d) no chance (glycerol is not osmotic)
e) cell lyses (explodes)