A train moves from one station to another in 2 hours time. Its speed-time graph during this motion is
shown in the figure. The maximum acceleration during the journey is:
A) 140 km h2
B) 160 km 1-2
C) 100 km h-2
D) 120 km h-2
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Explanation:
The compound K2O2 also exists. A chemist can determine the mass of K in a sample of known mass that consists of either pure K2O or pure K2O2. From this information, can the chemist answer the question of which compound is in the sample? Indicate yes or no, and explain.
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