For each word listed there is another word that has nearly the same meaning. But one has a clearly negative connotation, while the other is more neutral. Categorize each word. disaster nag problem difficult remind challenging

Neutral connotation : problem, remind, challenging

Negative connotation: nag, difficult, disaster

like poles repel so keep pushing north to north and repels funny to see this

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.