Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table because
A) hydrogen and helium repel one another.
B) the sizes of their atoms are vastly different.
C) they come from different sources.
D) helium is most similar to other group 18 elements.
Answer: D
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The Andromeda Galaxy has a look-back time of:
A) 4 years. B) 2000 years. C) 2 million years. D) 2 billion years.
Buoyancy: A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force on it?
A. the aluminum B. the lead C. Both have the same buoyant force. D. It cannot be determined without knowing their volumes.
A diver shines light up to the surface of a flat glass-bottomed boat at an angle of 30° relative to the normal. If the index of refraction of water and glass are 1.33 and 1.5, respectively, at what angle (in degrees) does the light leave the glass (relative to its normal)?
A. 26 B. 35 C. 42 D. 22 E. 48
About how far away from Earth would the Sun be located on this scale?
A) 3.75 meters (about 12 feet) B) 37.5 meters (about the height of a 12-story building) C) 375 meters (about the length of four football fields) D) 37.5 kilometers (the size of a large city)