Apermanent magnet can affect:
o
a. both permanent magnets and electromagnets.
o b. both non-magnets and electromagnets.
o
c. only permanent magnets.
o
d. only electromagnets and charged particles.
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What is the mass of sodium in 3 moles of sodium chloride

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.

How has the scientific model of the atom changed over the centuries, and what new evidence led to the various changes in the model?