Which of the following materials is most likely to act as a reducing agent?
A) Na
B) Na+
C) Cl2
D) Cl-
E) both A and B
Answer: A
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Water with a density of 1,000 
flows through a 4.00 cm diameter pipe with a velocity of 1.20 m/s. What is the mass flow rate?
A. 1.01 kg/s B. 1.21 kg/s C. 1.32 kg/s D. 1.40 kg/s E. 1.51 kg/s
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has been on its current orbit for only a short time compared to the age of our solar system. B) It came from the Oort cloud. C) It came from the Kuiper belt. D) It has a coma and tail during most of each orbit.
A 120-V rms voltage is applied across a 6.00-?F capacitor and a 100-? resistor. If the frequency of the generator is 60.0 Hz, what is the impedance of this circuit?
A) 153 ? B) 453 ? C) 353 ? D) 253 ? E) 553 ?
An individual's eye pupil changes from a diameter of 1.5 mm to 3.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 2.0 c. 0.43 b. 2.3 d. 0.65