Where would you expect to isolate molecules in a fractionating tower that have very few interatomic attractions?
A) near the bottom
B) near the top
C) near the middle
D) Fractional distillation takes advantage of molecular weight.
E) Fractional distillation takes advantage of the number of isomers.
Answer: B
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What is the energy of a photon whose frequency is 2.9 × 10^20 Hz? (h = 6.63 × 10^?34 J?s and 1 eV = 1.60 × 10^?19 J)
a. 0.2 MeV b. 1.2 MeV c. 1.9 MeV d. 3.1 MeV e. 0.8 MeV
Scientists hope that some day they will be able to produce a theory which will combine the strong force, the weak nuclear force, and electromagnetism. This theory has been called
A) The Grand Unified Theory. B) The Theory of Everything. C) The Unified Field Theory. D) The Electroweak Theory. E) The Electrostrong Theory.
An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
A. work must be done on the gas to return it to its original volume. B. heat must be exchanged with the surroundings to return the gas to its original temperature. C. its internal energy has a greater value after the expanded gas is returned to its original volume and temperature. D. of all of the above. E. of (a) and (b) above only.
A very long thin wire produces a magnetic field of 0.0050 × 10-4 T at a distance of 3.0 mm from the central axis of the wire. What is the magnitude of the current in the wire? (?0 = 4? × 10-7 T • m/
A) A) 7.5 mA B) 1.7 mA C) 3300 mA D) 24,000 mA