Water has unusual physical properties, as compared with H2S, H2Se, and H2Te, because of ______________ bonding
Fill in the blank(s) with correct word
hydrogen
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The equation 1/2 N2 + 3/2 H2? NH3 is not appropriately written because
a. the number of atoms of each element on each side is not the same. b. fractional coefficients are not generally used. c. nitrogen is not diatomic. d. the product is N2H4, not NH3.
Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
a. 12 N c. 24 N b. 18 N d. none of the above
Second Law of Thermodynamics: Which one of the following is a true statement?
A. The second law of thermodynamics is a consequence of the first law of thermodynamics. B. It is possible for heat to flow spontaneously from a hot body to a cold one or from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. C. It is not possible to convert work entirely into heat. D. It is impossible to transfer heat from a cooler to a hotter body. E. All of these statements are false.
A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted. Sound travels at 340 m/s in the air
How many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall?