Chemistry, 28.12.2019 02:31 Hannahrose911
The half-life of potassium-40 is 1.3 billion years. if a rock that formed 2.6 billion years ago originally contained 5 grams of potassium-40, about grams of potassium-40 would be left in that rock today
Answers: 2
Chemistry, 22.06.2019 00:10
Which of the following best describes the formation of plasma?
Answers: 1
Chemistry, 22.06.2019 00:30
In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right
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Chemistry, 22.06.2019 04:00
Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.
Answers: 2
The half-life of potassium-40 is 1.3 billion years. if a rock that formed 2.6 billion years ago orig...
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