How many moles of H2 bonds are broken if you react nitrogen with hydrogen according to the following reaction?
N2 + 3H2 ? 2 NH3
A) 6
B) 2
C) 3
D) 1
E) 8
Answer: C
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Which of the following waves has the highest frequency?
A) visible B) ultraviolet C) sound D) infrared E) radio
Based on current evidence, how does the actual average density of matter in the universe compare to the critical density?
A) The actual density, even with dark matter included, is less than about a third of the critical density. B) If we include dark matter, the actual density equals the critical density. C) The actual density of dark matter and luminous matter combined is no more than about 1% of the critical density. D) The actual density of matter is many times higher than the critical density.
What is the speed of a 4-kg ball with a momentum of 12 kg?m/s?
A) 3 m/s B) 4 m/s C) 12 m/s D) 48 m/s E) none of the above
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. For the next loading, the spring is compressed a distance d/2. How much work is required to load the second dart compared to that required to load the first?
1.two times as much 2.the same 3.half as much 4.one-fourth as much