The reason an astronaut in an earth satellite feels weightless is that
A) the astronaut is beyond the range of the earth's gravity.
B) the astronaut is falling.
C) the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel.
D) this is a psychological effect associated with rapid motion.
E) the astronaut's acceleration is zero.
Answer: B
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Different atoms in the same column of the periodic table of elements
A. have equal masses. B. have identical chemical properties. C. have a simple ratio of masses. D. have similar chemical properties.
If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which state will the electron make a transition?
A) n = 4 B) n = 5 C) n = 3 D) n = 2
When sodium and chlorine react to form sodium chloride, an ionic compound,
a. each sodium atom gains two electrons. b. each sodium atom gains one electron. c. each chlorine atom gains one electron. d. each chlorine atom gains two electrons.
Significant Figures: The number of significant figures in 0.040 is
A. one. B. two. C. three. D. four.