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when you buy eggs you usually ask for a
eggs. you know that one dozen of any
item is
paper is not packaged by the dozen. paper is packaged by a ream. a ream of paper has
500 sheets. why is it useful to use units like a dozen or a ream?
what determines how many items should make up a particular unit?
if you were asked to design a new unit to count something, what would you
consider when choosing how many items should be included in your new counting
unit?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

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.

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?