A jeweler needs to electroplate gold, having an atomic mass of 196.97 g/mol, onto a bracelet
He knows that the charge carriers in the ionic solution are singly-ionized gold ions, Au+, and has calculated that he must deposit of gold to reach the necessary thickness. How much current does he need to plate the bracelet in 3.0 hours? (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol) A) 9.1 mA
B) 540 mA
C) 33 A
D) 1800 mA
A
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Answer the following statement(s) true (T) or false (F)
Eagles and other predatory birds have very sharp eyesight. The pupil of an eagle’s eye is roughly twice the size of a human’s under similar (daylight) conditions. A friend claims to have read that an eagle’s eye has 8 times the resolving power of a human eye in broad daylight. This is physically impossible.
Make a prediction: If the rise in carbon dioxide concentration continues at its current pace, the concentration in the year 2050 will be about _____ parts per million.
A. 400 B. 430 C. 460 D. 510
What will the temperature of the cosmic microwave background be when the average distances between galaxies are twice as large as they are today?
A. 1.365 B. 4.860 C. 5.250 D. 3.375
An icy leftover planetesimal orbiting the Sun is
A) a comet. B) a meteor. C) an asteroid. D) a meteorite. E) possibly any of the above