For the following balanced reaction, which of the following is a solid?
2 Na(l) + Cl2(g) ? 2 NaCl(s)
A) Na
B) 2 Na
C) Cl2
D) Cl
E) NaCl
Answer: E
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Comparing Mercury to the Earth's Moon:
A. Mercury is more than 100 times the mass of Earth's Moon. B. Mercury is only about 1/100th the mass of Earth's Moon C. they both take the same time to complete one orbit around the Sun. D. they both have little atmosphere and a similarly cratered surface. E. Since Mercury has so many active volcanoes, the craters on its surface have almost all been wiped away, while the Moon's craters remain.
Molecular oxygen is composed of two oxygen atoms that share four electrons. How many covalent bonds exist between the two oxygen atoms?
a. none b. one c. two d. four e. eight
A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the ball
A) is exactly the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. B) is approximately the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. C) is independent of the mass of the ball. D) is independent of the mass of the sphere. E) can only be calculated using calculus.
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. E. B. F. C. G. D. H. E. A.