Complete and balance the equation: Al + HCl ? ____________________
Fill in the blank(s) with correct word
2Al + 6HCl ? 2AlCl3 + 3H2
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The Carboniferous period is well noted for the
A) emergence of the insect. B) evolution of the amniotic egg. C) age of the reptiles. D) extinction of shallow water organisms.
An ideal solenoid has a self-inductance L. If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?
A) L/4 B) L/2 C) 4L D) L E) 2L
The function of polarizing filters in viewing 3-D slides or movies is to provide each eye
A) the ability to see parallax. B) a balanced intensity. C) an independent left or right-eye view. D) a stereoscopic view. E) with light polarized at right angles to each other.
The Copernican (heliocentric) model explained things better than the Ptolemaic (geocentric) model, except:
a. it did not explain the relative positions of stars as seen from Earth at different times of year. b. it did not explain why Mercury is always near the Sun. c. it was conceptually more complex than the Ptolemaic model. d. it did not explain planetary motion clearly. e. it required a great deal more mathematical calculation.