The bond between carbon atoms in the molecule ethylene, H2C=CH2 is referred to as
A) an ionic bond
B) a double bond
C) a single bond
D) a triple bond
B
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The Cassini spacecraft detected large clouds of water vapor escaping from vents through the icy crust of Saturn's moon Enceladus
a. True b. False Indicate whether the statement is true or false
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
a. 0 b. 15 c. 29 d. 63 e. 250
A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the refrigerator in order to remove 250 J of heat from the interior?
A) 60 J B) 120 J C) 250 J D) 480 J E) 1050 J
Glacial debris is generally
A) well rounded and well sorted. B) a mishmash of shapes and sizes. C) unstriated. D) angular and well sorted.